Chapter 4

Question 1

What is 10BaseT

Answer 1

earliest form of ethernet designed to use UTP.

Question 2

Describe an ethernet frame?

Answer 2

preamble,MAC dest address, source mac, type, data, pad, FCS

Question 3

What does the preamble consist of?

Answer 3

64 bits of alternating ones and zeros that end with 11

-Let’s NIC know frame is coming and where frame starts.

Question 4

what is a sniffer?

Answer 4

can order NIC to run in promiscuous mode.

Question 5

What is the type field of an ethernet frame.

Answer 5

Lets receiving system know if its IPv4 or IPv6

Question 6

What is the data?

Answer 6

the payload

Question 7

What is the padding?

Answer 7

minimum frame size is 64 bytes

-adds extra data to bring up to 64 bytes.

Question 8

What is the FCS of a frame?

Answer 8

CRC

Question 9

What is CSMA/CD?

Answer 9

carrier sens multiple access/collision detection

-proper running network has max of 10% collissions

Question 10

Describe the 10BaseT standar

Answer 10

• use of CAT 3, two-pair, UTP
• send on pins 1 and 2
• receive on pins 3 and 6
• distance less than 100 meters
• max nodes 1024.
• topology physical star, logical bus

Question 11

Describe 10BaseFL

Answer 11

• max length 2km
• multimode
• sc or st
• speed 10 Mbps

Question 12

What is mediat dependent interface(MDI)?

Answer 12

regular port on hub or switch

Question 13

What is MDI-X?

Answer 13

uplink port

Question 14

What is a bridge?

Answer 14

Acts like a repeater or hub to connnect two ethernet segments.

• filters and forwards traffic based on MAC addresses.
• mainly used in wireless networks.

Question 15

What is an Ethernet switch?

Answer 15

• creates a source address table
• each port is its own collision domain.
• can buffer incoming frames
• full duplex ethernet: CSMA/CD is disabled.

Question 16

What is a unicast?

Answer 16

only sent to intended receiver.

Question 17

What is a broadcast?

Answer 17

sent to all the ports.

Question 18

What is a bridge loop?

Answer 18

Also called a switch loop, its a redundant connection in a network.

Question 19

What is spanning tree protocol?

Answer 19

STP eliminates accidental bridge loops.

• detects loops, communicates to other switches, set state to blocking.
• bridge protocol data unit.