CNIT 344: Intro to IP

IPs are on the ______ Layer

Network

T/F: IPv4 is connectionless

True

T/F: IPv4 is media dependent

False

What does “connectionless” mean?

The sender doesn’t know if the receiver is present, if the packet arrived, or if the receiver can read the packet. The receiver doesn’t know when the packet is coming

What does the term “unreliable” mean in best effort delivery?

It means simply that IP doesn’t have the capability to manage and recover from undelivered or corrupt packets.

Why are IPs allowed to function very efficiently at the network layer in the “best effort” delivery?

Protocols at other layers can manage reliability.

How does the “best effort” delivery protocol work?

Packets are routed through the network quickly, but some packets may be lost en route

How does media independent protocol work?

Not concerned with the medium, but the Maximum Transmission Unit (MTU).

What is fragmentation?

Intermediary devices will need to split up a packet when forwarding it from one media to a media with a smaller MTU.

Why would you separate hosts into networks?

Performance, security, and address management

IP addresses are divided into a 2 level hierarchy, ______ and _______.

network, host

T/F: Routers only need to know the address of each individual host, not only the network portion

False, only need to know the network portion

MAC addresses belong to what layer?

2

Network Addresses belong to what layer?

3

___________ is defined to all hosts on the network

Default Gateway

______________ is the address of the router interface

Gateway address

T/F: No packet can be forwarded without a route

True

The ___________ stores information about directly connected and remote networks

routing table

The process of mapping a hardware address to a higher-layer protocol address is called ______

address resolution

What is ARP?

Maps IPv4 addresses to a specific MAC address

In IPv6 host addressing, addresses are assigned to _________

interfaces

In IPv6 host addressing, ________ auto-configuration is used.

stateless