Ethernet

Question 1

CSMA/CD

Answer 1

Carrier-Sense Multiple Access / Collision Detect
Device listens to network to see if there is currently traffic.
If collision occurs, wait random amount of time to re-transmit.

Question 2

CSMA/CA

Answer 2

Carrier Sense Multiple Access / Collision Avoidance

Question 3

Full-Duplex Mode

Answer 3

Device simultaneously sends and receives

Question 4

PBX

Answer 4

Private Branch Exchange

Corporate telephone network

Question 5

Five Nines of Availability

Answer 5

System that is functioning 99.999 percent of the time

Only 5 minutes of downtime a year

Question 6

TTL

Answer 6

Time-to-Live

Question 7

STP

Answer 7

Spanning Tree Protocol

Allows Layer 2 loops while blocking data from continuously looping.

Question 8

Rapid Spanning Tree

Answer 8

Enhancement over STP.

Quicker to adjust to network conditions (such as additional / removal of Layer 2 links)

Question 9

SPB

Answer 9

Shortest Path Bridging

More scalable than STP

Question 10

Root Bridge

Answer 10

In STP, the switch with the lowest bridge ID (BID) is elected as root bridge.

Question 11

Nonroot Bridge

Answer 11

In STP, all switches except for root bridge.

Question 12

Link Aggregation

Answer 12

Logically combine multiple physical connections on a switch into a single logical connection.

Question 13

GBIC

Answer 13

Gigabit Interface Converter
Empty slot on switch which give flexibility in the uplink technology in an Ethernet switch. Available in MMF, SMF, and UTP.

Question 14

SFP

Answer 14

Small Form-Factor Pluggable
aka Mini-GBIC
Variations: SFP+ and QSFP

Question 15

Port Mirroring

Answer 15

Duplicate traffic on one port on another port of a switch.

Part of traffic audit for security or diagnostics.