University:
York University
Course:
AP/ITEC 1610 | Introduction to Computer Programming
Academic year:

2023
Views:

328

Pages:

2
Author:

Nick T.

Googles network 1. Connecting laptop needs to get its own IP address, ader of first hop router, addr of DNS server: use DHCP 2. Dynamic Host Configuration Protocol request is encapsulated in UDP, encapsulated in IP, encapsulated in 802.3 ethernet 3. DHCP server formulates DHCP ACK containg client IP adds, IP address of first-hop router for client, name and IP address of DNS server. Encapsulation at DHCP server frame forwarded (switch learning) through LAN, demultiplexed at client 4. Client receives DHOP ACK Le now has IP address, knows name/address of DNS server, IP address of ils first hop router BVT not read to send HTTP request! 5. Client creates DNS query, encapsulated in UDP, IP, Ethenet. To send Frame to router, need MAC address of router interface: ARP →Address resolution protocol gateway DNS 6. Frame sent to switch switch floods router receives replies to PC with its MAC address PC receives * Inthis case DNS server has googles Ip cached. 7. Client opens TCP socket to welo server 8 . TCP SYN segment routed to welo server, server responds with SYNACK ↳ step 1 + 2 of handshake 9. HTTP request sent into TCP socket 10. Datagram routed to www.google.com 11. Webserver responds with HTIP reply (containing web page) 12. to client 13. Reply routed Client demultiplex reply