Day 30 - Ethernet Switching

Question 1

With hubs, a __________ sent from one device can collide with a __________ sent by another device attached to that LAN segment

Answer 1

Frame

Question 2

Hubs had one single what?

Answer 2

Collision Domain

Question 3

Switches provide a larger number of interfaces to break up the __________ __________ into more segments

Answer 3

Collision Domain

Question 4

Switches use this now instead of using software to make forwarding decisions

Answer 4

Hardware based switching

Question 5

With modern switches, each computer connected to a separate port on the switch, each is in a separate __________ __________?

Answer 5

Collision Domain

Question 6

What are a few benefits of a switch over hubs?

Answer 6

Dedicated bandwidth to each port
Collision free environment
Full duplex operation

Question 7

When switches make the decision to forward or filter frames it uses a dynamically built __________ that is stored in RAM

Answer 7

MAC Address Table

Question 8

After a switch has learned a MAC Address and put it in its MAC Address table, it will __________ __________ __________ by not forwarding it out any other port including the port on which the frame was received

Answer 8

Filters the frame

Question 9

MAC Address Table entries that are not refreshed are eventually removed after the default of what?

Answer 9

300 Seconds (5 minutes)

Question 10

This provides loop prevention in Ethernet networks where redundant physical links exist

Answer 10

Spanning Tree Protocol

Question 11

A __________ __________ is the set of LAN interfaces whose frames could collide with each other

Answer 11

Collision Domain

Question 12

When one host is attached to a switch port on a modern switch, the switch creates a dedicated connection, thereby eliminating the potential for a what?

Answer 12

Collision

Question 13

A collection of connected switches forms one large what?

Answer 13

Broadcast Domain

Question 14

If a frame with the destination address __________ crosses a switch port, that switch port must __________ the frame out all other active ports

Answer 14

FFFF:FFFF:FFFF
Flood

Question 15

What switch forwarding method is described here?

The switch stores received frames in it’s buffers, analyzes each frame for information about the destination, and evaluates the data integrity using the CRC (cyclic redundancy check)

Answer 15

Store-and-forward switching mode

Question 16

What switch forwarding method is described here?

The switch buffers just enough of the frame to read the destination MAC Address so that it can determine which port to forward the data to. The switch does not perform any error checking on the frame

Answer 16

Cut-through switching mode

Question 17

What switch forwarding method is described here?

The switch waits for the collision window to pass before forwarding the frame. This mode provides better error checking than cut-through with no increase in latency

Answer 17

Fragment-free switching mode

Question 18

This type of switching provides switched connections between ports with the same bandwidth.

Answer 18

Symmetric Switching

Question 19

This type of switching provides switches connections between ports of unlike bandwidth

Answer 19

Asymmetric Switching

Question 20

802.? is the IEEE standard for Ethernet

Answer 20

802.3

Question 21

Ethernet separates the functions of the datalink layer into what two distinct sublayers?

Answer 21

Logical Link Control Sublayer
MAC Sublayer

Question 22

The __________ handles communication between the network layer and the MAC sublayer

Answer 22

Logical Link Control Sublayer

Question 23

The MAC sublayer has two primary responsibilities. What are they?

Answer 23

Data Encapsulation
Media Access Control

Question 24

What helps prevent collisions on a legacy device such as a hub?

Answer 24

CSMA/CD

Question 25

CSMA/CD operates in what mode?

Answer 25

Half duplex mode

Question 26

The three most common Ethernet standards used today are what?

Answer 26

10BASE-T
100BASE-TX
1000BASE-T

Question 27

Each manufacturer assigns a MAC Address with it’s own what as the first half of the address?

Answer 27

OUI (Organizationally Unique Identifier)

Question 28

IEEE defines two general categories of group addresses for Ethernet. What are they?

Answer 28

Broadcast addresses
Multicast Addresses

Question 29

Data is represented on three basic forms of network media. What are they?

Answer 29

Copper Cable
Fiber
Wireless