4. The Internet Layer

Question 1

1. What is the purpose of the TTL field in the IP header?

Answer 1

The TTL field is used to count the remaining hops before an IP datagram is dropped. It’s purpose is to prevent datagrams from circulating in the network indefinitely

Question 2

2. How big are the network and host ID fields for a Class A address?

Answer 2

The network ID is 8 bytes and the host ID is 24 bytes.

Question 3

3. What is an octlet?

Answer 3

An octlet is an 8-bit piece of data. Today it is commonly called a byte.

Question 4

4. What is the IP address an address of?

Answer 4

The IP address address individual network interfaces on a computer or networking devices.

Question 5

5. What is the difference between ARP and RARP?

Answer 5

ARP is used to map IP address into physical addresses. RARP is used to map physical addresses into IP address