Ethernet Basics

Question 1

What does this mean ?
10Base5

Answer 1

10 - speed in megabits per second
Base - This value is either going to be Base or Broad.
Base means that the entire bandwidth is only one channel.
5 - the length of that cable, so if you saw a 5, that stood for 500 meters.

Question 2

What does this mean?
10BaseT

Answer 2

10 - 10 megabits per second
Base - entire bandwidth is only one channel.
T - uses unshielded twisted pair with a switch in the middle.

Question 3

What is the standard that Ethernet is defined by?

Answer 3

802.3 standard

Question 4

What are two standards in a RJ45 connector.

Answer 4

TIA/EIA-568A and TIA/EIA-568B

Question 5

What Standard is this ?

https://brainscapedump.s3.ap-southeast-2.amazonaws.com/1.png

Answer 5

TIA/EIA-568B

If Green is in 6 then it is B

Question 6

What Standard is this?

https://brainscapedump.s3.ap-southeast-2.amazonaws.com/2.png

Answer 6

TIA/EIA-568A

If Orange is in 6 then it is A

Question 7

What is the technical name for an RJ-45

Answer 7

It is called an 8P8C

Question 8

In relation to the RJ45 standard, What standard is required for the straight-through cable,

Answer 8

the same standard on each side.
So, one side is 568B as well as the other side.

Question 9

In relation to the RJ45 standard, What standard is required for the crossover cable,

Answer 9

A crossover cable has 568B on one end and 568A on the other end.

Question 10

Which of the following is NOT part of an Ethernet frame?

FCS
Source IP address
Source MAC address
Data type

Answer 10

Source IP address

Question 11

What type of connector is used for terminating a UTP cable?

RJ-11
RS-232
RJ-45
F-Type

Answer 11

RJ-45

Question 12

What is the order of colors for the 568B standard?

OrW, Or, GrW, B, BW, G, BrW, Br
GrW, Gr, OrW, B, BW, Or, BrW, Br
GrW, B, OrW, B, BrW, Br, BW, Gr
OrB, BrW, Br, OrW, Gr, BW

Answer 12

OrW, Or, GrW, B, BW, G, BrW, Br

Question 13

What is the MAIN difference between a hub and a switch?

A hub puts all hosts in their own collision domain

A hub operates at Layer 1 and a switch operates at Layer 4

A hub uses ARP, and a switch doesn’t

A switch puts all hosts in their own collision domain

Answer 13

A switch puts all hosts in their own collision domain

Question 14

Which technology is used for devices to listen and see who is communicating?

ARP
CSMA/CD
Full-duplex
CSMA/CA

Answer 14

CSMA/CD

Question 15

What is the point of connecting multiple switches together

Answer 15

You can create a larger broadcast domain.

Question 16

What is a uplink port ?

Answer 16

The uplink port will allow you to connect two switches together.
it’s known as a medium dependent interface crossover or MDI-X.

Question 17

What is a switching loop

Answer 17

A switching loop is is when you’re connecting switch one -> two -> three -> one that can thus bring the network down.
STP (Spanning tree protocal) can prevent these from happening

Question 18

What is the different between a Hub and Switch?

Answer 18

HUB sends frames to everyone that connected to that Hub but a Switches forward frames based on MAC addresses.

Switches create and use MAC address tables to map ports and host devices.

Question 19

What is the biggest downside of using a Hub

Answer 19

Now, so, let’s just say two computers are having a conversation and another two computers are having a conversation.

As that’s taking place, the throughput for each conversation is half of the total bandwidth and that’s only with two conversations going.

Imagine if I had 5, 6, 7, 8 conversations going all simultaneously. you will get big degradation of the overall throughput because you have lots of people talking.

Question 20

What is carrier sense multiple access collision detection.

Answer 20

AKA CSMA/CD

if these two computers start talking at the same time their frames can potentially have a collision.

The problem with a hub is that only one conversation can take place

Question 22

True or False
HUB are compatible with the 100 Mb ethernet

Answer 22

False
Only switches are compatible with the 100 mb speeds

Hub have a max speed of 10 mb per second

Question 23

What is full duplex and half duplex

Answer 23

half duplex means that only one conversation can happen at the same time

Duplex means that two conversations can happen at the same time