Designing WAN Communications Quiz

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What is the main advantage of Voice over frame relay (VoFR) according to the summary?

Low cost of long-distance communication (correct)

Improved fault tolerance

High-speed data transfer

Enhanced security features

Which technology offers speeds up to 40 Gbps, as mentioned in the text?

ISDN

SONET

SMDS

ATM (correct)

What distinguishes DSL downstream speed from upstream speed based on the provided information?

Upstream speed is not affected by DSL technology

Both downstream and upstream speeds are the same

Downstream speed is slower than upstream speed

Downstream speed is greater than upstream speed (correct)

Which WAN technology employs high-speed bus bandwidth up to 155 Mbps?

SMDS Signup and view all the answers

What is the transmission speed reached by X.25 protocol based on packet switching?

2.048 Mbps Signup and view all the answers

What does SONET offer as a fiber-optic solution according to the information provided?

High speeds up to 9.953 Gbps Signup and view all the answers

Which technology is DSL a strong competitor to?

ISDN Signup and view all the answers

What is the main transport method for SONET?

Fiber-optic cable Signup and view all the answers

Which SONET transmission speed is designated by the code OC-48?

9953.28 Mbps Signup and view all the answers

In SONET, what does the Layer 2 (Section Layer) primarily do?

Encapsulate data, sequences, and time frames Signup and view all the answers

What network architecture uses a dual-ring topology for redundancy?

Ring topology Signup and view all the answers

Which technology is a high-speed alternative to SONET and frame relay?

Ethernet Signup and view all the answers

What type of cable connections can Ethernet backbone networks consist of?

Single-mode fiber-optic cable connections up to 43.4 miles Signup and view all the answers

'Bidirectional line switching' in SONET offers what percentage of redundancy?

~99% Signup and view all the answers

Which layer in the SONET model corresponds to the OSI model's Physical layer?

Photonic layer (bottom) Signup and view all the answers

What does SDH stand for?

Synchronous Digital Hierarchy Signup and view all the answers

What is one of the reasons for the popularity of X.25 networks?

Provision of worldwide connectivity between LANs Signup and view all the answers

How does Frame Relay differ from X.25 networks?

Frame Relay uses FRAD and is connection-oriented. Signup and view all the answers

Which technology is NOT mentioned as a replacement for X.25 networks?

ATM (Asynchronous Transfer Mode) Signup and view all the answers

What is a characteristic of Voice over Frame Relay (VoFR)?

Utilizes PCM, ADPCM, and SB-ADPCM for audio creation. Signup and view all the answers

What type of connection does Committed Information Rate (CIR) offer?

Pledged minimum transmission rate. Signup and view all the answers

Which service is NOT offered by frame relay service providers?

Integrated Services Digital Network (ISDN) Signup and view all the answers