Lecture 7

Question 1

What is ICMP?

Answer 1

Internet Control Message Protocol
• It is Network Layer protocol
• It is used for reporting errors on the network and
create messages.

Question 2

What are 2 ICMP applications?

Answer 2

ICMP Applications
o Ping
o Traceroute

Question 3

What are some ICMP messages?

Answer 3

ICMP messages
o Timeout
o Network Congestion
o Network errors (e.g. Unreachable host or network)

Question 4

What is Traceroute in terms of ICMP Applications?

Answer 4

Traceroute is used to help in debugging procedures

Question 5

What is PING in terms of ICMP Applications?

Answer 5

Packet InterNet Groper
• PING sends one or more IP packets to a host and expects a reply so as to measure the total delay time (round trip time)

Question 6

What is Transmission Control Protocol (TCP) ?

Answer 6

• Connection-oriented protocol
• Unicast point-to-point end-to-end bytes stream
• Reliable transmission
• 3 way Handshake

Question 7

What is User Datagram Protocol (UDP) ?

Answer 7

Unreliable transmission

Connectionless

Question 8

What are the 2 services of UDP?

Answer 8

Services
o Multiplexing
o Minimum Error Control

Question 9

What is an ARP Table?

Answer 9

ARP Table: Mappings IP / MAC addresses for LAN nodes

Each IP node (Host, Router) on LAN has an ARP table

Question 10

What is Proxy ARP?

Answer 10

Host or router responds to ARP Request arriving at one of the interconnected systems to host on another network