Basics

Question 1

What is Multiplexing?

Answer 1

Allows multiple people to use a baseband connection at the same time.

Question 2

Logical link control

Answer 2

Provides basic error control functions

Question 3

What is windowing in TCP

Answer 3

Allows clients to adjust amount of data in each segment

Question 4

What is Buffering

Answer 4

Occurs when devices allocate memory to store segments if bandwidth isn’t readily available

Question 5

Application Services

Answer 5

Layer 7.
Unites communication components from more that one network application

Question 6

Service Advertisements

Answer 6

Sending out of announcements to other devices on the network to state the services they offer.

Question 7

What is a port?

Answer 7

A logical opening on a system representing a service or application that’s listening and waiting for traffic.

Question 8

IPv4 Packets contain…

Answer 8

*Source address
*Destination address
*IP flags
*Protocol (UDP/TCP).

Question 9

Define Bandwidth

Answer 9

Theoretical measure of how much data could be transferred from a source to its destination

Question 10

Define Throughput

Answer 10

Actual measure of how much data is transferred from a source to its destination.

Question 11

Explain Traffic Filtering

Answer 11

Permits or denies traffic based on IP addresses or application ports.

Question 12

Broadcast Storm

Answer 12

Multiple copies of frames being forwarded back and forth which then consumes the network.

Question 13

Dedicated Leased Line

Answer 13

Logical connection that connects two sites through a service provider’s facility

Question 14

Circuit-Switched Connection

Answer 14

Connection is brought up only when needed, similar to making an phone call.

Question 15

Packet-Switched Connection

Answer 15

Works like an always-on dedicated lease line, but multiple customers share the bandwidth

Question 16

Channel Service Unit/Data Service Unit (CSU/DSU)

Answer 16

Terminates the digital signals a the customer’s location.

Question 17

Speed of a T1 line?

Answer 17

1.544 Mbps

Question 18

Metro Ethernet

Answer 18

Terminates the digital signals a the customer’s location with an Ethernet instead of a specialized CSU/DSU serial port.

Question 19

Cable Modems

Answer 19

Made up of a hybrid firber-coax (HFC) distribution network

Question 20

Data-Over-Cable Service Interface Specification (DOCSIS)

Answer 20

For cable modems

Question 21

Plain Old Telephone Service (POTS)

Answer 21

Runs on public switched telephone network (PSTN) which consists of all telephone carriers from around the world.

Question 22

Integrated Services Digital Network (ISDN)

Answer 22

An older technology designed to carry voice, video, or data over B (bearer) channels.

Question 23

Primary Rate Interface (PRI)

Answer 23

*1.472 Mbps data path
*Over 23 B channels and a 64 Kbps D channel.

Question 24

Synchronous Optical Network (SONET)

Answer 24

*Layer 1 technology
*Uses fiber
*51.84 Mbps (OC1) to 159.25 Gbps (OC-3072)

Question 25

User-Network Interface (UNI)

Answer 25

Used to connect ATM switches and endpoints.

Question 26

Typical available bandwidth for Frame Relay.

Answer 26

56 Kbps - 1.544 Mbps

Question 27

Typical available bandwidth for T3

Answer 27

44.736

Question 28

Typical available bandwidth for E1

Answer 28

2.048 Mbps

Question 29

Typical available bandwidth for E3

Answer 29

34.4 Mbps

Question 30

Typical available bandwidth for ATM (Asynchronous Transfer Mode)

Answer 30

155 - 622 Mbps
FIber

Question 31

ESD

Answer 31

Electrostatic Discharge

Question 32

Punch Down Block 66

Answer 32

For wiring telephone system

Question 33

Punch Down Block 110

Answer 33

For wiring ethernet

Question 34

CAN (Campus Area Network)

Answer 34

• Spans a limitied area
• Network that spans a limited geographic area.
• interconnect multiple local area networks (LAN) within an educational or corporate campus