Topic 3 Network Hardware Part 2 Switches_2

Question 1

Every device that connects to a switch should have the same Network IP address. True or false?

Answer 1

True. This means they part of the same LAN

Question 2

A switch considers all the devices as part of the same VLAN. True or false?

Answer 2

True

Question 3

What does the switch do when it received network traffic?

Answer 3

The switch reads the source MAC address of data coming in a port and puts that MAC address in the MAC address table next to the port number on which it was received.
(Eg. E0: 0260.8c01.1111)

When the switch gets a message in a port and the switch cannot find the destination MAC address in the table, it sends that message out EVERY live port on the switch except the port on which it was received. This is like a hub.

Broadcast messages on a switch are always sent out all live ports except the one on which it was received.

Question 4

What does a MAC address table hold?

Answer 4

1. MAC address
2. Port number to match

Question 5

What happens the switch is populated?

Answer 5

It can move unicast messages data directly from the “ingress” port to the correct destination, or “egress” port.

• This means no collisions can happen on the network
• It also improved bandwidth for every machine
• Improves security as every machine is not receiving all information that any device sends

Question 6

What happens when a switch receives a broadcast message?

Answer 6

It will send that message to all of its ports except the receiving port.

Question 7

What is the difference between a hub and a switch that received a broadcast message?

Answer 7

A hub takes a signal in one port and recreate it on every other port on the hub, REGARDLESS of the data. When a switch receives a broadcast message, it will send that broadcast out all ports except receiving port.

Essentially, only when switch receive broadcast message then it will send to all ports but for hub it will recreate and send to all of its ports regardless of the signal it receives.

Question 8

When a switch is booted up it has a blank MAC address table. True or false

Answer 8

True

Question 9

What is included in the frame when a machine sends a frame of information?

Answer 9

1. Sender’s MAC address
2. Destination MAC address

Question 10

Explain fully what happens when a switch receives a frame of information.

Answer 10

The switch looks up the destination MAC address in its table and find a particular port location.
The switch will then move the data from the sender’s port to the destination’s port based on the MAC address table’s port match.
(Switches can have many MAC addresses mapped to one port)

Question 11

What is port density?

Answer 11

Number of ports available in a single switch

Question 12

State type of switch port densities.

Answer 12

1. 24-port switch
2. 48-port switch
3. Modular switch with up to 1000+ ports

Question 13

What are the considerations to select a switch for a hierarchical network?

Answer 13

1. Port density
2. Switch Form Factors

Question 14

State examples of switch form factors

Answer 14

1. Fixed configuration switches - features and options are limited to those that originally come with the switch
2. Modular configuration switch - The chassis accepts line cards that contain the ports.
3. Stackable Configuration switches - Connected by a special cable, effectively operate as one large switch

Question 15

What are the features of access layer?

Answer 15

1. Port security
2. VLANs
3. Fast ethernet/Gigabit Ethernet
4. Power over Ethernet (PoE)
5. Link aggregation
6. Quality of service

Question 16

What are the features of distribution layer?

Answer 16

1. Layer 3 support
2. High forwarding rate
3. Gigabit Ethernet/10Gigabit Ethernet
4. Redundant components
5. Security Policies/Access control Lists
6. Link aggregation
7. QOS

Question 17

What are the features of core layer?

Answer 17

1. Layer 3 support
2. Very high forwarding rate
3. Gigabit Ethernet/10Gigabit Ethernet
4. Redundant components
5. Link aggregation
6. QOS

Question 18

What is Telnet?

Answer 18

1. Most common access method
2. Sends clear text message streams
3. Is not secure

Question 19

What is SSH

Answer 19

1. Should be the common access method
2. Sends encrypted message stream
3. Is secure

Question 20

What are the common features of a modern network security tool?

Answer 20

1. Service identification
2. Support of SSL services
3. Non-destructive and destructive testing
4. Database of vulnerabilities

Question 21

What can you use network security tools for?

Answer 21

Capture chat messages
Capture files from NFS traffic
Capture HTTP requests in Common Log Format
Capture passwords
and more…