Lectures 19-21

Question 1

What are the layers of the TCP/IP model?

Answer 1

Application
Transport
Internet
Link

Question 2

What are some of the protocols used in the Application layer?

Answer 2

HTTP/S, FTP, SFTP

Question 3

What are some of the protocols used in the Transport Layer?

Answer 3

TCP, UDP

Question 4

What is a protocol used in the Internet layer?

Answer 4

IP

Question 5

What are some of the protocols used in the link layer?

Answer 5

Ethernet, Wi-Fi, ARP

Question 6

What things is UDP used for?

Answer 6

Things that require high speed transmission such as games or online meetings

Question 7

What things is TCP used for?

Answer 7

Web servers, logins, FTP

Question 8

Why is UDP faster than TCP?

Answer 8

UDP has no error checking, the packets may not all arrive or be in the right order whereas TCP does both of these things

Question 9

How long are IPv4 addresses?

Answer 9

32 bits

Question 10

How are IPv4 addresses divided?

Answer 10

The recognised format is the first three bytes represent the local network address then the last byte represents a machine on that network.

The network administrator can choose how many bits are used for the network address. So, 31 of the bits could be used for the network address.

Question 11

What addresses are always reserved?

Answer 11

0 and 255 (the network identifier and the broadcast address, respectively)

Question 12

What are the issues with network classes?

Answer 12

Class C network too small for most orgs (max 256 addresses)
Class B network far too big (max 65, 534 addresses)
Class A network extremely big (max 16 million addresses)