Summary

In this chapter we have examined the structure of IP datagrams, and how IP addresses can be best managed by using the Dynamic Host Configuration Protocol (DHCP). Although Chapter 38 covered some operational aspects of IP, it’s important to understand the structure of IP datagrams for troubleshooting.

Questions

1.	What functions does IP not carry out in the stack? Addressing Routing Formatting Securitization
2.	What protocols does IP not rely upon for its operation? Address Resolution Protocol (ARP) Reverse Address Resolution Protocol (RARP) Simple Mail Transfer Protocol (SMTP) Internet Control Message Protocol (ICMP)
3.	What command is typically used as the interface to check for errors on the network? snoop watch in.rarpd ping
4.	What does the Type of Service not specify? Packets are designated as requiring high speed. Packets are designated as requiring TCP. Packets are designated as requiring high reliability. Packets are designated as requiring maximum bandwidth.
5.	If bits 0–2 of the Type of Service were 000, what would be the message priority? Normal traffic Priority traffic Immediate traffic Flash traffic
6.	If bits 0–2 of the Type of Service were 001, what would be the message priority? Normal traffic Priority traffic Immediate traffic Flash traffic
7.	If bits 0–2 of the Type of Service were 010, what would be the message priority? Normal traffic Priority traffic Immediate traffic Flash traffic
8.	If bits 0–2 of the Type of Service were 011, what would be the message priority? Normal traffic Priority traffic Immediate traffic Flash traffic
9.	What is the maximum total packet length in bytes? 1500 16636 32675 65535
10.	What type of packets must be fragmented? Small packets Medium packets Large packets All packets
11.	What is the protocol number for IP? 0 1 3 6
12.	What is the protocol number for ICMP? 0 1 3 6
13.	What is the protocol number for GGP? 0 1 3 6
14.	What is the protocol number for TCP? 0 1 3 6
15.	What command is used to check whether IP packets are being transmitted correctly between a source and destination network interface? inetd snell traceroute openlook

Answers

1.	D. IP does not carry out securitizarion in the stack.
2.	C. IP does not rely upon SMTP for its operation.
3.	D. The ping command is typically used as the interface to check for errors on the network.
4.	B. The Type of Service does not specify that packets are designated as requiring TCP.
5.	A. The message priority for 000 is normal traffic.
6.	B. The message priority for 001 is priority traffic.
7.	C. The message priority for 010 is immediate traffic.
8.	D. The message priority for 011 is flash traffic.
9.	D. The maximum total packet length is 65536 bytes.
10.	C. Large packets must be fragmented.
11.	A. The protocol number for IP is 0.
12.	B. The protocol number for ICMP is 1.
13.	C. The protocol number for GGP is 3.
14.	D. The protocol number for TCP is 6.
15.	C. The traceroute command is used to check whether IP packets are being transmitted correctly between a source and destination network interface.