Chapter 3

Question 1

Communication between a web server and web client is an example of an interaction between several protocols. Name the four.

Answer 1

HTTP
TCP
IP
Ethernet

Question 2

Segmentation:

Answer 2

Breaking communication into pieces

Question 3

Name the five Protocol Data Units Encapsulation processes and their respective layers

Answer 3

Data - Physical layer
Segment - Transport layer
Packet - Network layer
Frame - Data Link layer
Bits - Physical layer - when physically Tx data over the medium

Question 4

The ___ and ___ link layers are responsible for delivering the data from source and destination address, but their addresses have different purposes.

Answer 4

network and data

Question 5

The IP packet contains two IP addresses - what are they?

Answer 5

1. Source IP

2. Destination IP

Question 6

What does Layer 2 and Layer 3 do?

Answer 6

Layer 2: header uses NIC as source and destination (data link layer)
Layer 3: IP packet uses IP addresses as source and destination (network layer)

Question 7

What’s the role of the network layer address and its two parts?

Answer 7

Gives an IP address for source and destination
Network Portion: 192.168.1 network address
Host Portion: 110 end part

Question 8

T or F: The subnet mask is used to identify the network portion of an address form the host portion.

Answer 8

True

Question 9

MAC address of an NIC is written in what notation?

hexidecimal, decimal or binary?

Answer 9

hexidecimal

Question 10

TCP/IP is an example of a ____.

Answer 10

Protocol suite

Question 11

What’s the two most widely used networking models?

Answer 11

OSI and TCP/IP

Question 12

Protocol Data Units (PDU) are named according to the protocols of the TCP/IP. What are the five names?

Answer 12

Data Segment
Packet Frame
Bits

Question 13

What would cause a switch to have multiple addresses?

Answer 13

Another switch is connected to it.

Question 14

What is protocol?

Answer 14

List of rules

Question 15

what is multiplexing?

Answer 15

More than one thing on a line or data

Question 16

Describe Physical Layer

Answer 16

Gets info across the cable, transports data across the data link - gets from one side of network to the other.

Question 17

Describe bandwidth and through-put

Answer 17

Bandwidth: Maximum speed available, capacity of the medium to carry the data.
Throughput: How fast data is traveling, (not more speed) - the measure of the bits across the media at a given time.

Question 18

Describe Latency and Goodput

Answer 18

Latency: amount of time (delays) for data to travel from A to B
Goodput - measure of good data Tx over a given time.

Question 19

What is stored in the CAM (MAC Address table)?

Answer 19

Source MAC address.

Question 20

Draw out cross-over cables and straight through cables and define its use.

Answer 20

Cross-over uses like devices (switch-switch, host-host, router-PC)
Straight-through uses un-like devices (host-switch, switch to router)

Question 21

What is the frame check sequence?

Answer 21

Error detection

Question 22

Clients ___ for stuff, servers ___ stuff.

Answer 22

ask (info) / give (info)

Question 23

Scalabililty | does or does not | use peer to peer?

Answer 23

doesn’t

Question 24

Physical layer and data link layer are the | same or different | thing?

Answer 24

Same

Question 25

What’s the difference between a switch and a router?

Answer 25

Routers are on a separate network while switches make networks larger.

Question 26

Describe each:
CSM-CD
CSM-CA

Answer 26

CSM-CD - collision detection, wired systems 802.3

CSM-CA - collision avoidance, wireless systems 802.11

Question 27

What does MAC stand for and what does it do?

Answer 27

Media Access Control - controls the media

Question 28

What does LLC stand for and what does it do?

Answer 28

Logical Link Layer - communicates with the network layer.

Question 29

OSI Network Layer is the same as TCP/IP ___ Layer

Answer 29

Internet

Question 30

MAC addresses are written in what? hexidermal, decimal, or binary,

Answer 30

Hexidecimal

Question 31

What’s the difference between controlled and convention access?

Answer 31

Controlled - wait your turn

Convention - talk when you want, carrier sense

Question 32

Destination MAC addresses can be unicast, multicast or broadcast, but the source MAC address must always be ___.

Answer 32

unicast