WAN Networks

Question 1

Dedicated leased line

Answer 1

Connects two sites and does not share bandwidth. Point-to-point connection, common: T1/T3/E1/E3. Multiplexing allowed, using different 64Kbps channels (DS0). Terminates at CSU/DSU (if using old analog).

Question 2

Circuit-switched connection

Answer 2

Only brought up when needed.

Question 3

Packet-switched connection

Answer 3

Always on, like a dedicated line, but shares bandwidth. SLAs determine the QoS.

Question 4

Optical Carrier rates (OC)

Answer 4

OC1 - 51.84 Mbps, all the rest are multiples of this.

Question 5

Frame Relay

Answer 5

56 Kbps to 1.544 Mbps

Question 6

T1

Answer 6

1.544 Mbps, uses 24DS0s which is 193 bits (8bits per channel and 1 frame bit) * 8000 samples per sec.

Grouping: Super frame (SF) 12 frames at once. Extended Super Frame (ESF) 24 frames at once.

Question 7

T3

Answer 7

44.736 Mbps, uses 672 DS0s. Coaxial cable.

Question 8

E1

Answer 8

2.048 Mbps, uses 32DS0s.

Grouping: Multiframe, 16 frames at once.

Question 9

E3

Answer 9

34.4 Mbps.

Question 10

ATM

Answer 10

155 Mbps to 622 Mbps

Question 11

SONET

Answer 11

51.84 (OC-1) to 159.25Gbps(Oc-3072)

Question 12

Point-to-Point Protocol

Answer 12

Transmit protocol for dedicated leased lines. Authentication by PAP and/or CHAP

Question 13

Digital Subscriber Line

Answer 13

Over telephone lines.
ADSL - asymmetric DSL, simultaneous voice and data. 18,000ft distance.
SDSL - symmetric connection speeds. Therefore not simultaneous. 12,000ft distance.
VDSL - Highest bandwidth but 4000ft distance.

Uses a T1 connection, therefore dedicated leased line