LAN Switch

Question 1

What is CSMA/CD

Answer 1

Carrier Sense Multiple Access with Collision Detector; helps Ethernet manage signals

Question 2

What is OSI

Answer 2

Open System Interconnection: It has 7 layers for data transport

Question 3

What is the difference between a hub and a repeater

Answer 3

Repeater is a physical device that extends the segment in a network; a hub can amplify the signal and retransmits it to a number of ports.

Question 4

How to form a broadcast domain

Answer 4

interconnect two switches in a network; additional layer of layer 3 network devise such as a router

Question 5

What is Collision Domain?

Answer 5

Separate network segment; collision is limited to the domain rather the entire network

Question 6

A segment is a network connection made by ___________

Answer 6

a single unbroken network cable.

Question 7

What does Switches and Bridge have in common?

Answer 7

Both connect LAN Segments; both use a table of MAC Address to identify segments of which the frame should send; and both help reduce network traffic

Question 8

How are Switches are more advanced than Bridges?

Answer 8

Lower per port cost, fast internal switching, multiple port speed, large frame buffer, high port density

Question 9

What is the difference between a Cut-Through-Switching and a Store-and-Forward Switching?

Answer 9

Cut Through Switching acts on the data and determines what port to send based on the first frame received, no error checking, no collision prevention; store and forward has to wait till the data is received fully and does an error check

Question 10

What is frame-free switching?

Answer 10

a type of Cut Through Switching, but it ensures that the frames were not sent until a confirmation of no collision in the transfer. It made sure that the sent frames are not bad.

Question 11

What is Fast-Forward Switching?

Answer 11

Lowest latency, starts forwarding when destination address is known

Question 12

What is flooding?

Answer 12

if a switch doesn’t have a destination port entry, it will transmit the frame out of the all ports except for the port on which it received the frame

Question 13

When will a switch forward or drop a frame?

Answer 13

Forward when frame destination has a valid entry and not in the same network segment; Drop when destination address entry reside within the same network segment

Question 14

What does VLAN do?

Answer 14

Virtual Local Area Network creates groups of logically networked devices as they are on their own independent network, even though they are connected with other VLAN infrastructures.

Question 15

What is NSAP?

Answer 15

Network Service Access Point

Question 16

What is the function of ARP?

Answer 16

Address Resolution Protocol is responsible for mapping layer 3 (Network) IP addresses to Layer 2 (Data Link) MAC address.

Question 17

Switches learn network topology

Answer 17

recording various source MAC addresses(when frames received) and assign ports-to-addresses in its MAC Table for future uses.

Question 18

What is the difference between User EXEC and Privileged EXEC mode?

Answer 18

Privileged EXEC mode is a IOS software mode that can use all commands and password protection.