41902 Chapter Notes - Chapter 4-3: Ip Address, Network Address Translation, Ip Fragmentation
Network Fundamentals
Chapter 4.3: IP: Internet Protocol
IP fragmentation & reassembly:
- Network links have MTU (max. transfer size) – largest possible link-level frame
- Different link types have different MTUs
- Large IP datagrams are divided/fragmented within the network
- Oe dataga is split ito seeal datagas he set ad ae easseled ol at the fial
destination. IP header bits are used to identify and order the related fragments.
IPv4 addressing:
- IP address: 32-bit identified for host, router interface
- Interface: connection between host/router and physical link.
- Routers typically have multiple interfaces. Host typically has one or two interfaces
Subnets:
- IP address (subnet part – high order bits, host part – low order bits). Device interfaces with
same subnet part of IP address. Can physically reach each other without intervening router.
- To deteie the suets, detah eah itefae fo it’s host o oute, eatig islads of
isolated networks. Each isolated network is called a subnet. E.g. subnet mask: /24
- ROUTE E.G: IP address: 223.1.3.1 , subnet mask: 255.555.55.0 , Router: 233.1.3.5
Dynamic Host Configuration Protocol (DHCP)
- The goal of DHCP is to allow a host to dynamically obtain its IP address from network server
when it joins network. It can renew its lease on addresses in use, allow reuse of addresses
ol addess hile oet/o, ad poide suppot fo oile uses ho at to joi
network.
- A host euests IP addess: DHCP euest essage ad the DHCP see seds the address:
DHCP ak essage. DHCP a etu the alloated IP addess o a suet, addess of fist-
hop router for client, name and IP address of DNS server, and network mask.
- DHCP example:
find more resources at oneclass.com
find more resources at oneclass.com
