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

2023
Views:

441

Pages:

2
Author:

Nick T.

Dynamic Host Configuration Protocol (DHCP) Goal: host dynamically obtains IP address from network server when it joins network can renew its lease on address allow reuse of addresses host → discover → offer → request → ack DHCP server DHCP can also provide: address of first hop router for client name & IP of DNS server network mask Hierarchical Addressing Used by IPv4 for subnets Once all IPv4 addresses used → use IPv6 (128-bit address space) Network Address Translation Enables one, unique IP address to represent an entire group of computers Devices in a LAN have private IP addresses Implementation: NAT Router must Outgoing from LAN: replace (source IP address, port#) to (NAT IP address, new port#) as destination address Remember (in NAT translation table) every (source IP, port#) to (NAT IP, new port#) translation pair Incoming: replace (NAT IP, new port#) in destination field with corresponding (source IP address, port#) stored in NAT table. Title: Network - Control Plane Heading: Routing - determine route taken from source to destination Goal: determine 'good' path from sending host to receiving host, through network of routers Path: sequence of routers Good: least 'cost', fastest, least congested Path Configuration can be: Global: all routers have complete topologies link cost info Decentralized: iterative process of computation, exchange info with neighbors distance vector algorithms OR link state algorithms Static: routes change slowly over time Dynamic: routes change quickly with periodic updates