Fund of an Ethernet LAN

Question 1

Describe the 3-way handshake.

Answer 1

Happens before TCP does anything. 2 bits inside TCP FLAG field. User sends SYN, Server replies with SYN-ACK, User replies with ACK

Question 2

Describe the sequence of packets that terminates a TCP connection

Answer 2

User sends ACK-FIN, Server replies with ACK and then ACK-FIN, User replies with ACK

Question 3

How many bytes and bits is a MAC address?

Answer 3

6 bytes or 48 bits

Question 4

Name the layers of the TCP/IP Model.

Answer 4

Application, Transport, Network, Data link, Physical

Question 5

Ethernet pinouts on a PC?

Answer 5

1 and 2 for Transmit, 3 and 6 to Receive

Question 6

Ethernet pinouts on a switch?

Answer 6

3 and 6 for Transmit, 1 and 2 to Receive

Question 7

Crossover cable pinouts?

Answer 7

1 to 3, 2 to 6

Question 8

Pinout pairs on a PC with gigabit cabling

Answer 8

1 and 2, 3 and 6, 4 and 5, 7 and 8

Question 9

What goes into the TYPE field of an Ethernet header designating IPV4?

Answer 9

0800

Question 10

What goes into the TYPE field of an Ethernet header designating IPV6?

Answer 10

86DD

Question 11

How long is the TYPE field of an Ethernet header?

Answer 11

2 bytes

Question 12

Name the field in the Ethernet trailer.

Answer 12

FCS

Question 13

For TCP and UDP, what is multiplexing?

Answer 13

The process of adding a port number to TCP or UDP header identifying which application the packet is meant for.

Question 14

What 3 things make up a socket?

Answer 14

IP address, the transport protocol, and the port number

Question 15

Is a leased line full duplex or half duplex?

Answer 15

Full Duplex

Question 16

How many wires in a leased line?

Answer 16

4. Two pair. One pair each for sending and receiving, thereby allowing for full duplex.

Question 17

What kind of cable goes from router to CSU/DSU?

Answer 17

Serial cable less than 50 feet. Also known as DTE cables.