Chapter 5

Question 1

Class A

Answer 1

First byte: 1-126

Network.host.host.host

Default subnet mask: 255.0.0.0

Question 2

Class B

Answer 2

First byte: 128-191

Network.network.host.host

Default subnet mask: 255.255.0.0

Question 3

Class C

Answer 3

First byte: 192-223

Network.network.network.host

Default subnet mask: 255.255.255.0

Question 4

Port

Answer 4

Each application layer software has a unique port address. It’s used to link to the application layer

Question 5

Port 80

Answer 5

Http

Question 6

Port 443

Answer 6

Https

Question 7

Port 21

Answer 7

FTP

Question 8

Port 25

Answer 8

SMPT

Question 9

Quality of Service (QoS)

Answer 9

A special type of connection-oriented messaging in which different connections are assigned different priorities.

Different classes of service are defined, each with different priorities

Question 10

Unicast

Answer 10

One computer to another computer

Question 11

Broadcast

Answer 11

One computer to all computers in the network (what you will see in wireshark)

Question 12

Multicast

Answer 12

One computer to a group of computers (ex. Videoconferencing)

Question 13

Routing Information Protocol (RIP)

Answer 13

-Dynamic distance vector protocol used for interior routing

• Operation:
• Network manager builds the touting table
• Routing tables broadcast periodically(every minute or so)
• When new computers are added, router counts “hops” and selects the shortest route
• useful in smaller, less complex networks

Question 14

Open Shortest Path First (OSPF)

Answer 14

• Dynamic link state protocol used for interior routing
• most widely used interior routing protocol on large enterprise networks
• more reliable paths
• less burdensome to the network because only updates sent

Question 15

Dynamic Host Configuration Protocol (DHCP)

Answer 15

• most common protocol for dynamic addressing
• device sends out a broadcast message
• DHCP responds with IP settings
• addresses are “leased for a length of time

When the computer is turned on and connects to the network, it first issues a broadcast DHCP message that is directed to any DHCP server that can “hear” the message. This message asks the server to assign the requesting computer a unique network layer address. The server runs a corresponding DHCP software package that responds to these requests and sends a message back to the client, giving it its network layer address

Question 16

Domain Name Service (DNS)

Answer 16

Translates application layer address into network layer address.

Www.indiana.edu———>129.79.78.193

Question 17

Address Resolution Protocol (ARP)

Answer 17

Identifies MAC address of the next device in the circuit

Translates network layer to data link layer