{"id":37303,"date":"2019-10-31T22:16:52","date_gmt":"2019-10-31T19:16:52","guid":{"rendered":"https:\/\/prohoster.info\/blog\/trening-cisco-200-125-ccna-v3-0-den-20-staticheskaya-marshrutizatsiya\/"},"modified":"2019-10-31T22:16:52","modified_gmt":"2019-10-31T19:16:52","slug":"trening-cisco-200-125-ccna-v3-0-den-20-staticheskaya-marshrutizatsiya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/administrirovanie\/trening-cisco-200-125-ccna-v3-0-den-20-staticheskaya-marshrutizatsiya","title":{"rendered":"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ast\u0103zi vom discuta despre rutarea static\u0103 \u0219i vom examina trei subiecte: ce este rutarea static\u0103, cum se configureaz\u0103 \u0219i care \u00eei este alternativa. Observa\u021bi topologia re\u021belei, care include un computer cu adresa IP 192.168.1.10, conectat printr-un switch la un gateway sau router. Pentru aceast\u0103 conexiune se folose\u0219te portul routerului f0\/0 cu adresa IP 192.168.1.1.<\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/5941633c826f4703dfd1fa32d0edfeb8.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAl doilea port al acestui router, f0\/1, cu adresa IP 192.168.2.1, este conectat la portul f0\/0 al unui alt router, iar acest interfa\u021b\u0103 are adresa 192.168.2.2. Al doilea router este conectat prin portul f0\/1, cu adresa 192.168.3.2, la un al treilea router, care folose\u0219te pentru aceast\u0103 conexiune portul f0\/0 cu adresa IP 192.168.3.3. <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>\u00cen final, al treilea router este conectat la al doilea switch prin portul f0\/1, cu adresa 192.168.4.3, iar switch-ul este conectat la al doilea computer cu adresa IP 192.168.4.10.<br \/>\nDac\u0103 \u0219ti\u021bi cum s\u0103 \u00eemp\u0103r\u021bi\u021bi subre\u021belele pe baza adreselor IP, atunci considera\u021bi c\u0103 segmentul de la primul computer la primul router apar\u021bine unei subre\u021bele, segmentul \u00eentre primul \u0219i al doilea router \u2013 uneia a doua, \u00eentre al doilea \u0219i al treilea router \u2013 uneia a treia \u0219i \u00eentre al treilea router \u0219i al doilea computer \u2013 uneia a patra. Astfel, avem 4 re\u021bele diferite. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/9feae690bc728c38e79bc3f6c02ecd30.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDac\u0103 computerul 192.168.1.10 dore\u0219te s\u0103 comunice cu computerul 192.168.4.10, atunci mai \u00eent\u00e2i trebuie s\u0103-\u0219i trimit\u0103 datele c\u0103tre gateway-ul 192.168.1.1. Acesta creeaz\u0103 un cadru \u00een care plaseaz\u0103 adresa IP surs\u0103 \u0219i destina\u021bie, adresa MAC surs\u0103 \u0219i destina\u021bie \u0219i \u00eel trimite router-ului. Routerul elimin\u0103 informa\u021bia de nivel 2, adic\u0103 adresele MAC, \u0219i se uit\u0103 la informa\u021bia de nivel 3. Afl\u00e2nd c\u0103 datele sunt adresate unui dispozitiv cu adresa IP 192.168.4.10, routerul \u00een\u021belege c\u0103 un astfel de dispozitiv nu este conectat la el, prin urmare, trebuie doar s\u0103 permit\u0103 trecerea acestui cadru prin re\u021bea. Se consult\u0103 cu tabela sa de rutare \u0219i vede c\u0103 datele pentru re\u021beaua 4 trebuie trimise dispozitivului cu adresa IP 192.168.2.2. <\/p>\n<p>\u00cen mod similar, al doilea router se consult\u0103 cu tabla sa de rutare, afle c\u0103 datele pentru re\u021beaua 4 trebuie trimise la adresa IP 192.168.3.3 \u0219i trimite cadrul celui de-al treilea router. \u00cen cele din urm\u0103, al treilea router se consult\u0103 cu tabela sa, determin\u0103 c\u0103 re\u021beaua 4 este conectat\u0103 la el \u0219i trimite cadrul c\u0103tre al doilea computer. <\/p>\n<p>S\u0103 analiz\u0103m cum se creeaz\u0103 o tabel\u0103 de rutare. Pentru aceasta, vom folosi Cisco Packet Tracer \u0219i vom observa cum este implementat\u0103 concep\u021bia de rutare. Aici este reprezentat\u0103 aceea\u0219i topologie de re\u021bea, iar acum voi atribui routerelor adrese IP corespunz\u0103toare, specific\u00e2nd \u0219i adresele gateway-urilor implicite. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/b503e68daa0c91b614ea99ceb82bcea1.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNu facem nimic cu switch-ul, deoarece acesta func\u021bioneaz\u0103 cu set\u0103rile implicite \u0219i folose\u0219te VLAN1. S\u0103 \u00eencepem cu set\u0103rile primului router Router0. Mai \u00eent\u00e2i, \u00eei vom atribui numele gazd\u0103 R1, dup\u0103 care vom introduce adresa IP \u0219i masca de subre\u021bea pentru interfa\u021ba f0\/0. Apoi, trebuie s\u0103 aplic\u0103m comanda no shutdown. Observa\u021bi cum markerul interfe\u021bei s-a schimbat de la ro\u0219u la verde, ceea ce \u00eenseamn\u0103 c\u0103 portul a fost activat \u00een re\u021bea. <\/p>\n<p>Apoi, trebuie s\u0103 configur\u0103m al doilea port al routerului f0\/1, men\u021bin\u00e2nd acela\u0219i nume gazd\u0103, doar ad\u0103ug\u0103m adresa IP 192.168.2.1 \u0219i masca de subre\u021bea 255.255.255.0. Nu este nimic nou aici, este o configurare simpl\u0103, deja cunoa\u0219te\u021bi toate comenzile, a\u0219a c\u0103 voi trece repede prin ceilal\u021bi routere. Pe m\u0103sur\u0103 ce voi atribui adrese IP \u0219i voi folosi comanda no shut, porturile routerelor \u00ee\u0219i vor schimba culoarea \u00een verde, indic\u00e2nd c\u0103 leg\u0103tura \u00eentre dispozitive a fost stabilit\u0103. De asemenea, creez re\u021belele 1, 2, 3 \u0219i 4. Ultimul octet al adresei IP a portului routerului indic\u0103 num\u0103rul routerului, iar penultimul octet \u2013 num\u0103rul re\u021belei conectate la acest port. <\/p>\n<p>Astfel, primele adrese ale porturilor pentru primul router vor fi 192.168.1.1 (primul router, prima re\u021bea) \u0219i 192.168.2.1 (primul router, a doua re\u021bea), pentru al doilea router \u2013 192.168.2.2 (al doilea router, a doua re\u021bea) \u0219i 192.168.3.2 (al doilea router, a treia re\u021bea), iar pentru al treilea router \u2013 192.168.3.3 (al treilea router, a treia re\u021bea) \u0219i 192.168.4.3 (al treilea router, a patra re\u021bea). Din punctul meu de vedere, este destul de u\u0219or de re\u021binut, totu\u0219i \u00een realitate adresele pot fi generate diferit, \u00een func\u021bie de regulile acceptate \u00een compania dumneavoastr\u0103. Trebuie s\u0103 respecta\u021bi regulile companiei, deoarece colegul dumneavoastr\u0103 va avea mai u\u0219or s\u0103 depisteze problemele din re\u021beaua dumneavoastr\u0103 dac\u0103 aceasta este configurat\u0103 conform regulilor. <\/p>\n<p>Deci, am terminat de atribuit porturilor routerului adrese IP, iar acum observa\u021bi c\u0103 portul celui de-al doilea switch \u0219i-a schimbat culoarea \u00een verde, deoarece conexiunea dintre acesta \u0219i cel de-al doilea computer s-a stabilit automat. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/9c40fce3c97ccd74cc171db06eb1fbe3.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAcum voi deschide terminalul de linie de comand\u0103 al primului computer \u0219i voi face ping la al doilea computer la adresa 192.168.4.10. S\u0103 trecem \u00een modul de simulare \u2013 acum vede\u021bi mi\u0219carea animat\u0103 a pachetelor de ping prin re\u021bea. Voi efectua din nou ping-ul pentru ca voi s\u0103 pute\u021bi observa cu aten\u021bie ce se \u00eent\u00e2mpl\u0103. \u00cen dreapta, \u00een tabel, vede\u021bi ICMP, Internet Control Message Protocol \u2013 aceasta este denumirea ping-ului. Ping-ul este un protocol pe care \u00eel folosim pentru a verifica conexiunea. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/5980a47be7ffd841857d9a7ecb7e84a0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTrimite\u021bi un pachet de test unui alt dispozitiv, iar dac\u0103 acesta \u00eel returneaz\u0103, conexiunea a fost stabilit\u0103 cu succes. Dac\u0103 face\u021bi clic pe pachetul de ping din diagram\u0103, pute\u021bi vizualiza informa\u021biile despre transfer. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/e823432150942224088acf25a415057c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVe\u021bi vedea datele nivelului 3 OSI \u2013 acestea sunt adresele IP de surs\u0103 \u0219i destina\u021bie pentru ping, datele de nivel 2 sub form\u0103 de adrese MAC corespunz\u0103toare \u0219i datele de nivel 1 sub form\u0103 de denumire a portului (porturilor) \u2013 acestea sunt FastEthernet0. De asemenea, pute\u021bi privi formatul cadrelor de ping: header, tip \u0219i corpul pachetului. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/e4e3a84708c9785840c1c1837b11f4a1.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nCadrele sunt direc\u021bionate c\u0103tre switch, care analizeaz\u0103 adresele MAC \u0219i le trimite mai departe prin re\u021bea c\u0103tre router. Routerul vede adresa IP 192.168.4.10 \u0219i rejecteaz\u0103 pachetul, deoarece nu cunoa\u0219te o astfel de adres\u0103. S\u0103 vedem ce se \u00eent\u00e2mpl\u0103 \u00een timp real, de aceea s\u0103 revenim la ping din fereastra liniei de comand\u0103. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/34da5eb51618af20960caa273d262f74.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVede\u021bi c\u0103 \u00een \u00eencercarea de a face ping la computerul 192.168.4.10, toate cele 4 pachete au fost pierdute \u2013 de la routerul 192.168.1.1 a fost primit r\u0103spunsul c\u0103 gazda de destina\u021bie nu este disponibil\u0103. Revenim \u00een fereastra interfe\u021bei liniei de comand\u0103 a routerului \u0219i introducem comanda show ip route. Vede\u021bi cea mai important\u0103 parte \u2013 tabelul de rutare, iar comanda pe care am introdus-o este una dintre comenzile de baz\u0103 ale rut\u0103rii Cisco. \u00cen acest moment, acest tabel con\u021bine 2 \u00eenregistr\u0103ri. La \u00eenceputul tabelului exist\u0103 o list\u0103 a abrevierilor folosite, din care se vede c\u0103 litera C desemneaz\u0103 conexiunile. Prima \u00eenregistrare indic\u0103 faptul c\u0103 re\u021beaua 192.168.1.0\/24 este conectat\u0103 direct la portul FastEthernet0\/0, iar re\u021beaua 192.168.2.0\/24 este conectat\u0103 direct la portul FastEthernet0\/1. Acest lucru \u00eenseamn\u0103 c\u0103 \u00een prezent routerul cunoa\u0219te doar aceste dou\u0103 re\u021bele. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/1f4cbb9f07c31267266b74465274ea2c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nValoarea 192.168.1.0\/24 este un identificator de re\u021bea. Atunci c\u00e2nd am creat subre\u021bele, am creat simultan identificatorii acestora. Ace\u0219ti identificatori \u00eei spun routerului c\u0103 toate dispozitivele, a c\u0103ror adrese IP se afl\u0103 \u00een intervalul de la 192.168.1.1 la 192.168.1.254, sunt situate \u00een aceast\u0103 subre\u021bea. Astfel, toate aceste dispozitive ar trebui s\u0103 fie tehnic accesibile pentru router, deoarece acesta este conectat la aceast\u0103 re\u021bea. <\/p>\n<p>Dac\u0103 la sf\u00e2r\u0219itul identificatorului se afl\u0103 valoarea \/24, aceasta \u00eenseamn\u0103 c\u0103 tuturor dispozitivelor din aceast\u0103 re\u021bea, de la 1 la 254, le va fi trimis\u0103 o cerere de difuzare. A\u0219adar, la acest router sunt conectate doar re\u021belele 1 \u0219i 2, de aceea el cunoa\u0219te doar aceste re\u021bele. De aceea, c\u00e2nd pingul de la adresa 192.168.4.10 ajunge la router, acesta nu \u0219tie c\u0103 aceast\u0103 adres\u0103 este accesibil\u0103 prin ruta Router0 - Router1 - Router2. <\/p>\n<p>Dar tu, ca administrator de re\u021bea, \u0219tii c\u0103 aceast\u0103 rut\u0103 este accesibil\u0103, adic\u0103 c\u0103 primul router poate trimite acest pachet celui de-al doilea router. Prin urmare, trebuie s\u0103 organizezi rutare static\u0103. S\u0103 \u00eencerc\u0103m s\u0103 facem acest lucru. <\/p>\n<p>Vom spune acestui router c\u0103 orice pachet \u0219i orice trafic destinat re\u021belei 192.168.4.0\/24 trebuie s\u0103 fie trimis celui de-al doilea router. Formatul comenzii pentru a desemna rutarea static\u0103 este de forma: ip route   . <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/c17f599b793ef6f77c10c5589774a2e9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAcum v\u0103 voi ar\u0103ta ce \u00eenseamn\u0103 asta. Folosim pentru aceast\u0103 comand\u0103 modul de configurare global\u0103 a set\u0103rilor routerului. Tast\u0103m ip route 192.168.4.0 255.255.255.0 - aceasta \u00eenseamn\u0103 c\u0103 orice trafic pentru dispozitivele re\u021belei, a c\u0103ror adres\u0103 IP are valoarea ultimului octet de la 1 la 254, va ajunge aici, \u0219i apoi tastez fie adresa IP, fie denumirea portului la care acest trafic trebuie s\u0103 fie trimis. \u00cen acest caz, tastez denumirea interfe\u021bei f0\/1, adic\u0103 comanda devine: ip route 192.168.4.0 255.255.255.0 f0\/1.<\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/4575e9767ccb91423a7cc96a13ee7248.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cen loc de interfa\u021ba gateway-ului, pot indica adresa sa IP, atunci comanda de rutare static\u0103 va ar\u0103ta ca ip route 192.168.4.0 255.255.255.0 192.168.2.2.<\/p>\n<p>Pute\u021bi \u00eentreba care este mai bun. Cred c\u0103 pentru re\u021belele de tip difuzare, cum ar fi Ethernet, este mai bine s\u0103 specifica\u021bi adresa IP. Dac\u0103 utiliza\u021bi re\u021bele de tip punct-la-punct, cum ar fi Frame Relay (re\u021bele cu retransmisie sau comutare a cadrelor), este mai bine s\u0103 utiliza\u021bi interfa\u021ba de ie\u0219ire. Mai t\u00e2rziu vom examina re\u021belele Frame Relay, dar acum folosesc o variant\u0103 mai adecvat\u0103 a comenzii de rutare -192.168.4.0 255.255.255.0.<\/p>\n<p>Acum s\u0103 ne uit\u0103m la tabela de rutare, utiliz\u00e2nd comanda do show ip address. Observa\u021bi c\u0103 \u00een ea a ap\u0103rut o nou\u0103 \u00eenregistrare, denumit\u0103 cu litera S, adic\u0103 static. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/f8948b09d65241d05287c5730f803f99.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAceast\u0103 \u00eenregistrare indic\u0103 faptul c\u0103, dac\u0103 exist\u0103 trafic pentru re\u021beaua 192.168.4.0\/24, acesta trebuie trimis destinarului printr-un dispozitiv cu adresa IP 192.168.2.2. S\u0103 ne \u00eentoarcem la linia de comand\u0103 a computerului \u0219i s\u0103 ping-uim adresa necesar\u0103 din nou. Acum traficul ar trebui s\u0103 treac\u0103 prin primul router \u0219i s\u0103 ajung\u0103 la al doilea router, care ar trebui s\u0103 resping\u0103 pachetele.<\/p>\n<p>\u00cen primul caz, routerul nu a respins doar pachetele, ci a \u0219i r\u0103spuns computerului c\u0103 adresa IP 192.168.4.10 nu este disponibil\u0103. Totu\u0219i, al doilea router poate r\u0103spunde doar primului router, de la care a primit traficul. S\u0103 ne uit\u0103m la tabela de rutare a celui de-al doilea router. Aici se spune c\u0103 Router1 cunoa\u0219te doar re\u021belele 2 \u0219i 3 \u0219i nu \u0219tie nimic despre re\u021beaua 4, unde ar trebui s\u0103 trimit\u0103 pachetele primului computer. El ar trimite un mesaj \u00eenapoi, indic\u00e2nd c\u0103 gazda de destina\u021bie nu este disponibil\u0103, dar nu \u0219tie cum s\u0103 se conecteze la computerul care a trimis aceste pachete, deoarece nu \u0219tie nimic despre re\u021beaua 1. De aceea, \u00een loc de un mesaj despre indisponibilitatea gazdei de destina\u021bie, am primit mesajul Request timed out \u2013 timpul de a\u0219teptare al solicit\u0103rii a expirat. Diferitele dispozitive de re\u021bea au valori diferite pentru TTL, astfel \u00eenc\u00e2t, atunci c\u00e2nd pachetele IP ating aceast\u0103 valoare, ele sunt distruse. \u00cen acest proces, se face un num\u0103r\u0103toare invers\u0103 \u2013 se realizeaz\u0103 un hop, iar contorul TTL scade de la 16 la 15, al doilea \u2013 de la 15 la 14 \u0219i a\u0219a mai departe, p\u00e2n\u0103 c\u00e2nd valoarea TTL ajunge la 0 \u0219i pachetul este distrus. <\/p>\n<p>A\u0219a func\u021bioneaz\u0103 mecanismul de prevenire a buclelor cu pachete IP. Astfel, dac\u0103 un dispozitiv nu prime\u0219te o solicitare \u00een timpul stabilit, sistemul va emite un mesaj similar. A\u0219adar, s\u0103 trecem la set\u0103rile celui de-al doilea router \u0219i s\u0103-i ar\u0103t\u0103m cum poate ajunge la subre\u021beaua patru. Pentru aceasta, folosesc comanda ip route 192.168.4.0 255.255.255.0 192.168.3.3. Acum, \u00eenregistrarea corespunz\u0103toare a ap\u0103rut \u00een tabela de rutare, pe care am apelat-o cu comanda do show ip route. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/664c1b0866ed85046590589f7a1073bd.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAcum Router1 \u0219tie cum s\u0103 trimit\u0103 traficul c\u0103tre destinarile subre\u021belei patru. El \u00eel trimite c\u0103tre al treilea router. Al treilea router Router2, deoarece este conectat la re\u021beaua 4., \u0219tie cu siguran\u021b\u0103 cum s\u0103 trimit\u0103 pachetul c\u0103tre al doilea computer.<\/p>\n<p>Ce se va \u00eent\u00e2mpla dac\u0103 trimit din nou un ping? Pentru c\u0103 acum toate dispozitivele de re\u021bea \u0219tiu cum s\u0103 ajung\u0103 la al doilea computer. Va fi acum pingarea adresei IP 192.168.4.10 reu\u0219it\u0103? Nu, nu va fi! <\/p>\n<p>A\u0219a cum am men\u021bionat, ICMP este un protocol de comunica\u021bie bidirec\u021bional, a\u0219adar, dac\u0103 cineva trimite pachete de ping, acestea trebuie s\u0103 se \u00eentoarc\u0103. Rutarea const\u0103 \u00een faptul c\u0103 fiecare dispozitiv de re\u021bea trebuie nu doar s\u0103 \u0219tie cum s\u0103 trimit\u0103 un mesaj cuiva, ci trebuie \u0219i s\u0103 \u0219tie cum s\u0103 livreze mesajul de r\u0103spuns expeditorului solicit\u0103rii. A\u0219adar, pachetul trimis de primul computer a ajuns cu succes la al doilea computer. Al doilea computer crede: \u201eexcelent, am primit mesajul t\u0103u \u0219i acum trebuie s\u0103-\u021bi trimit un r\u0103spuns\u201d. Acest r\u0103spuns, adresat dispozitivului cu adresa IP 192.168.1.10, ajunge la routerul Router2. Al treilea router vede c\u0103 trebuie s\u0103 trimit\u0103 pachetul \u00een prima subre\u021bea, dar \u00een tabela sa de rutare are \u00eenregistr\u0103ri doar pentru subre\u021belele trei \u0219i patru. De aceea, trebuie s\u0103 cre\u0103m o rut\u0103 static\u0103 cu ajutorul comenzii ip route 192.168.1.0 255.255.255.0 192.168.3.2. Aceast\u0103 comand\u0103 indic\u0103 faptul c\u0103 traficul destinat re\u021belei cu identificatorul 192.168.1.0 trebuie s\u0103 fie trimis celui de-al doilea router cu adresa IP 192.168.3.2. <\/p>\n<p>Ce se va \u00eent\u00e2mpla dup\u0103 aceasta? Al doilea router \u0219tie despre re\u021belele 2., 3. \u0219i 4., dar nu \u0219tie nimic despre prima re\u021bea. A\u0219adar, trebuie s\u0103 intr\u0103m \u00een set\u0103rile celui de-al doilea router Router1 \u0219i s\u0103 folosim comanda ip route 192.168.1.0 255.255.255.0 192.168.2.1, adic\u0103 s\u0103 indic\u0103m c\u0103 traficul pentru re\u021beaua 1. trebuie s\u0103 fie trimis prin re\u021beaua 2. c\u0103tre primul router Router0.<\/p>\n<p>Dup\u0103 aceasta, pachetul ajunge la primul router, care cunoa\u0219te dispozitivul 192.168.1.10, deoarece prima re\u021bea \u00een care se afl\u0103 acest computer este conectat\u0103 la portul acestui router. Men\u021bionez c\u0103 acum primul router nu \u0219tie nimic despre re\u021beaua 3, iar al treilea router nu \u0219tie nimic despre a doua re\u021bea. Acest lucru poate crea o problem\u0103, deoarece ace\u0219ti routere nu cunosc existen\u021ba subre\u021belelor intermediare. <\/p>\n<p>\u00cencerc din nou s\u0103 pinguiesc adresa 192.168.4.0 \u0219i vede\u021bi c\u0103 de data aceasta ping-ul a avut succes. Pachetele au parcurs \u00eentregul drum de la primul la al doilea computer \u0219i r\u0103spunsul a fost \u00eentors expeditorului. \u00cen fereastra de comand\u0103 se vede un mesaj conform c\u0103ruia fiecare dintre cele 4 pachete de r\u0103spuns 192.168.4.0 are 32 de octe\u021bi, TTL= 125 ms, \u0219i succesul ping-ului este de 100%. Aceasta \u00eenseamn\u0103 c\u0103 sursa de transmitere a primit r\u0103spuns de la gazda de destina\u021bie. Astfel, chiar dac\u0103 dispozitivele nu cunosc existen\u021ba unor re\u021bele intermediare, acest lucru nu conteaz\u0103 dac\u0103 lucreaz\u0103 pe principiul \u201eexpeditor final \u2013 destinatar final\u201d. Primul computer \u0219tie cum s\u0103 ajung\u0103 la al doilea computer, iar al doilea \u0219tie cum s\u0103 ajung\u0103 la primul. <\/p>\n<p>S\u0103 lu\u0103m \u00een considerare o alt\u0103 situa\u021bie. A\u0219adar, primul computer poate comunica cu succes cu al doilea computer, \u00een timp ce traficul trece prin toate aceste dispozitive. S\u0103 vedem dac\u0103 PC0 poate s\u0103 se conecteze la al treilea router Router2 la adresa 192.168.3.3 \u2013 acesta este portul re\u021belei 3 al celui de-al treilea router. Ping-ul arat\u0103 c\u0103 acest lucru nu este posibil \u2013 gazda de destina\u021bie nu este disponibil\u0103. <\/p>\n<p>S\u0103 vedem care este cauza. Deschiz\u00e2nd tabela de rutare a primului router, vedem c\u0103 el cunoa\u0219te doar 3 re\u021bele \u2013 prima, a doua \u0219i a patra, dar nu \u0219tie nimic despre a treia re\u021bea. Prin urmare, dac\u0103 vreau s\u0103 m\u0103 conectez la aceast\u0103 re\u021bea, trebuie s\u0103 stabilesc un traseu static pentru ea. <\/p>\n<p>A\u0219adar, am discutat despre cum se poate configura rutarea static\u0103 pentru trei routere. Dac\u0103 ave\u021bi 10 routere \u0219i 50 de subre\u021bele diferite, configurarea manual\u0103 a rut\u0103rii statice va dura foarte mult timp. Asta este motivul pentru care avem nevoie de rutare dinamic\u0103. <br \/>\nAcum voi \u0219terge toate rutele pe care le-am creat. Pentru aceasta, voi apela la r\u00e2nd pe r\u00e2nd tabelele de rutare ale tuturor routerelor \u0219i voi ad\u0103uga cuv\u00e2ntul \u201eno\u201d la \u00eenceputul fiec\u0103rei intr\u0103ri de rutare static\u0103, adic\u0103 voi folosi comanda de negare. Acum putem discuta despre ce reprezint\u0103 rutarea dinamic\u0103. <\/p>\n<p>Pentru rutarea dinamic\u0103, trebuie s\u0103 activez protocolul RIP, care este un protocol foarte rapid. Dar ast\u0103zi nu vom discuta despre RIP, subiectul nostru este rutarea static\u0103, iar eu am vrut s\u0103 v\u0103 ar\u0103t c\u00e2t de minu\u021bios \u0219i obositor este acest lucru. Totu\u0219i, voi demonstra rapid cum func\u021bioneaz\u0103 RIP, pe care \u00eel vom analiza \u00een detaliu \u00een lec\u021bia urm\u0103toare.<br \/>\nPe exemplul primului router, folosesc comanda router rip, apoi introduc ver 2 pentru a specifica versiunea protocolului, \u0219i apoi enumer \u00een linii separate re\u021belele pentru care trebuie s\u0103 utilizez protocolul de rutare dinamic: 192.168.1.0, 192.168.2.0, dup\u0103 care voi trece la al doilea router \u0219i voi proceda similar. Tehnic, doar specific re\u021belele conectate la acest dispozitiv, a\u0219a c\u0103 pentru al doilea router voi indica 192.168.2.0 \u0219i 192.168.3.0, iar pentru al treilea, dup\u0103 comanda rip ver 2 \u2013 adresele 192.168.3.0 \u0219i 192.168.4.0. Apoi m\u0103 voi \u00eentoarce la primul router \u0219i voi verifica tabela de rutare. <\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/270cd3f2448e6312efe605a2a53c5de2.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVede\u021bi c\u0103 \u00een ea au ap\u0103rut magic toate re\u021belele, primele dou\u0103 fiind cele conectate direct la router, iar celelalte dou\u0103 fiind cele pentru care conecta\u021bia se face prin protocolul de rutare dinamic RIP. O situa\u021bie similar\u0103 se observ\u0103 \u00een tabelele de rutare ale celui de-al doilea \u0219i al treilea router. Dac\u0103 voi conecta la al doilea router re\u021belele 5. \u0219i 6., toate dispozitivele care folosesc RIP vor \u0219ti despre aceste re\u021bele noi. Aceasta este avantajul rut\u0103rii dinamice.<\/p>\n<p><img decoding=\"async\" alt=\"Antrenament Cisco 200-125 CCNA v3.0. Ziua 20. Rutare static\u0103\" src=\"\/wp-content\/uploads\/2019\/08\/7eb5a6eff6ad5728a1778d5652d31027.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDac\u0103 acum am s\u0103 fac ping la al doilea computer, conexiunea va func\u021biona f\u0103r\u0103 probleme. Pot face ping la al treilea router, iar pingul va fi reu\u0219it, deoarece primul router, datorit\u0103 RIP, cunoa\u0219te toate dispozitivele din toate re\u021belele. Acela\u0219i \u00abcuno\u0219tin\u021be\u00bb le vor avea \u0219i al doilea \u0219i al treilea router. Nu spun c\u0103 RIP este cel mai bun protocol, dar este capabil s\u0103 execute eficient multe lucruri. P\u00e2n\u0103 acum, vreau doar s\u0103 \u00een\u021belege\u021bi ce este rutarea \u0219i cum func\u021bioneaz\u0103, ce este o tabel\u0103 de rutare \u0219i care este importan\u021ba ei. <\/p>\n<p>Indiferent dac\u0103 folosi\u021bi rutare static\u0103 sau dinamic\u0103, rolul protocoalelor este de a completa tabelul de rutare. Aceast\u0103 tabel\u0103 trebuie s\u0103 cunoasc\u0103 toate rutele c\u0103tre toate dispozitivele din re\u021bea, astfel \u00eenc\u00e2t un dispozitiv s\u0103 poat\u0103 stabili o conexiune cu alt dispozitiv. <\/p>\n<p>Deci, ast\u0103zi a\u021bi \u00eenv\u0103\u021bat c\u0103 rutarea este un proces care asigur\u0103 apari\u021bia \u00eenregistr\u0103rilor de rute \u00een tabelele de rutare, astfel \u00eenc\u00e2t routerul s\u0103 poat\u0103 lua decizii privind trimisul traficului prin re\u021bea. <\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"I39vbF65jOk\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/I39vbF65jOk\/hqdefault.jpg\" alt=\"Reda\u021bi video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><br \/>\nV\u0103 mul\u021bumim c\u0103 r\u0103m\u00e2ne\u021bi cu noi. V\u0103 plac articolele noastre? Dori\u021bi s\u0103 vede\u021bi mai multe materiale interesante? Sus\u021bine\u021bi-ne f\u0103c\u00e2nd o comand\u0103 sau recomand\u00e2ndu-ne prietenilor. <b>30% reducere pentru utilizatorii Habr pentru un server entry-level unic, creat special pentru tine:<\/b> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/347386\/\">Adev\u0103rul despre VPS (KVM) E5-2650 v4 (6 nuclee) 10GB DDR4 240GB SSD 1Gbps de la 20$ sau cum s\u0103 \u00eemp\u0103r\u021bim corect un server?<\/a><\/noindex> (sunt disponibile op\u021biuni cu RAID1 \u0219i RAID10, p\u00e2n\u0103 la 24 nuclee \u0219i p\u00e2n\u0103 la 40GB DDR4).<\/p>\n<p><b>Dell R730xd la jum\u0103tate de pre\u021b?<\/b> Numai la noi <b><noindex><a rel=\"nofollow\" href=\"https:\/\/ua-hosting.company\/serversnl\">2 x Intel TetraDeca-Core Xeon 2x E5-2697v3 2.6GHz 14C 64GB DDR4 4x960GB SSD 1Gbps 100 TB de la 199 $<\/a><\/noindex> \u00een Olanda! <b>Dell R420 \u2014 2x E5-2430 2.2Ghz 6C 128GB DDR3 2x960GB SSD 1Gbps 100TB \u2014 de la 99 $!<\/b><\/b> Citi\u021bi despre <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/329618\/\">Cum s\u0103 construi\u021bi o infrastructur\u0103 de clas\u0103 enterprise folosind servere Dell R730xd E5-2650 v4 la pre\u021buri foarte mici de 9000 \u20ac?<\/a><\/noindex><br \/>\n<br \/>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/463569\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0435\u0433\u043e\u0434\u043d\u044f \u043c\u044b \u043f\u043e\u0433\u043e\u0432\u043e\u0440\u0438\u043c \u043e \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0438 \u0438 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0442\u0440\u0438 \u0442\u0435\u043c\u044b: \u0447\u0442\u043e \u0442\u0430\u043a\u043e\u0435 \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u044f, \u043a\u0430\u043a \u043e\u043d\u0430 \u043d\u0430\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0438 \u043a\u0430\u043a\u0430\u044f \u0443 \u043d\u0435\u0451 \u0430\u043b\u044c\u0442\u0435\u0440\u043d\u0430\u0442\u0438\u0432\u0430. \u0412\u044b \u0432\u0438\u0434\u0438\u0442\u0435 \u0442\u043e\u043f\u043e\u043b\u043e\u0433\u0438\u044e \u0441\u0435\u0442\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442 \u0432 \u0441\u0435\u0431\u044f \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440 \u0441 IP-\u0430\u0434\u0440\u0435\u0441\u043e\u043c 192.168.1.10, \u043f\u043e\u0434\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u043d\u044b\u0439 \u0447\u0435\u0440\u0435\u0437 \u0441\u0432\u0438\u0442\u0447 \u043a \u0448\u043b\u044e\u0437\u0443, \u0438\u043b\u0438 \u0440\u043e\u0443\u0442\u0435\u0440\u0443. \u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043f\u043e\u0440\u0442 \u0440\u043e\u0443\u0442\u0435\u0440\u0430 f0\/0 \u0441 IP-\u0430\u0434\u0440\u0435\u0441\u043e\u043c 192.168.1.1. \u0412\u0442\u043e\u0440\u043e\u0439 \u043f\u043e\u0440\u0442 \u044d\u0442\u043e\u0433\u043e \u0440\u043e\u0443\u0442\u0435\u0440\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27983,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-37303","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - 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