Section 11

Question 1

3 WAN connection types

Answer 1

Dedicated Leased Line
Circuit Switched Connection
Packet-Switched Connection

Question 2

Dedicated Leased Line

Answer 2

Point to point connection between two sites
All bandwidth all the time
Expensive
Digital circuits

Question 3

Circuit-Switched Connection

Answer 3

Connection is brought up only when needed, like making a phone call

Question 4

Packet-Switched Connection

Answer 4

Always on
Multiple customers share bandwidth
SLAs used to guarantee a certain quality

Question 5

CSU/DSU

Answer 5

Channel Service Unit/Data Service Unit
Terminates the digital signal at customer location
Dedicated leased line

Question 6

Metro ethernet

Answer 6

Ethernet interfaces to customers
Less expensive than specialized ports used in CSU/DSU
Technology used hidden from customer

Question 7

PPP

Answer 7

Point-to-point protocol

Layer 3 protocol on dedicated leased lines to transmit layer 3 protocols simultaneously

Question 8

LCP

Answer 8

PPP Link Control Protocol
Multilink interface
Looped link detection
Error detection
Authentication

Question 9

PPP Authentication methods

Answer 9

Password Authentication Protocol (PAP)
Challenge-Handshake Authentication Protocol (CHAP)
Microsoft Challenge-Handshake Authentication Protocol (MS_CHAP)

Question 10

PAP

Answer 10

Password Authentication Protocol
Performs one-way authentication between slient and server
Credentials in clear text

Question 11

CHAP

Answer 11

Challenge-Handshake Authentication Protocol
Performs one-way authentication using three-way handshake
Hashed credentials

Question 12

MS-CHAP

Answer 12

Microsoft Challenge-Handshake Authentication Protocol

Microsoft version of CHAP

Question 13

PPPoE

Answer 13

PPP over ethernet

Commonly used with DSL modes

Question 14

DSL

Answer 14

Digital Subscriber Line

Question 15

ADSL

Answer 15

Asymmetric DSL
Maximum distance to DSLA: 18k ft
Voice and data on same line
Downstream: 8Mbps
Upstream: 1.544 Mbps

Question 16

SDSL

Answer 16

Symmetric DSL
Maximum distance to DSLAM: 12k ft
No simultaneous voice and data on same line
Downstream: 1.168 Mbps
Upstream: 1.168 Mbps

Question 17

VDSL

Answer 17

Very High Bit-Rate DSL
Maximum distance to DSLAM: 4k ft
Downstream: 52Mbps
Upstream: 12 Mbps

Question 18

Cable Modems

Answer 18

Hybrid-Fiber Coax (HFC) - cable tv containing both coaxial and fiber-optic
Specific frequencies for Downstream and upstream
Upstream: 5MHz tp 42MHz
Downstream: 50MHz to 860MHz

Question 19

Satellite Modems

Answer 19

Rural/remote locations
Low bandwidth
Weather

Question 20

POTS

Answer 20

Plain Old Telephone Service
Analog connections using Public Switched Telephone Network (PSTN)
Max bandwidth: 53.3 kbps

Question 21

ISDN

Answer 21

Integrated Services Digital Network

Older technology using B channels

Question 22

Frame Relay

Answer 22

Sites connected to virtual circuits
Low cost and widely available
On-demand
Layer 2 technology

Question 23

SONET

Answer 23

Synchronous Optical Network 
Layer 1 technology using fiber
155 Mbps to 10Gbps
20km to 250km
Bus or Ring topology