Optical Switching Networks — Test 1

Correct Answer: B. B. Optical cross connects
Explanation: Optical cross-connects incorporate switching connections or light paths. These larger arrays can switch signals from one port to another.

Correct Answer: D. D. Sdh/sonet
Explanation: The circuit is said to be static when the network resources remain dedicated to the circuit connection. This should be followed during the entire transfer and the complete message follows the same path.

Correct Answer: D. D. Disability to handle burst traffic
Explanation: In traffic conditions, data is sent in the form of bursts of different lengths. Thus, the resources cannot be readily assigned. The OCS cannot efficiently handle burst traffic.

Correct Answer: C. C. Optical circuit-switched
Explanation: In an optical packet-switched network, data is transported in the optical domain. This is done without intermediate optic-electrical conversions. Optical electro-conversions takes place in circuit-switched networks.

Correct Answer: A. A. Four
Explanation: An optical packet switch performs four basic functions. These include routing, forwarding, switching and buffering.

Correct Answer: C. C. Buffering
Explanation: Switching involves directing the packets. Routing provides network connectivity while forwarding and reversing involves defining a packet. Buffering usually provides data storage for packets.

Correct Answer: C. C. Guard band
Explanation: A packet consists of a header and the payload. The label points to an entry in the lookup table. A guard band is usually included to ensure the data is not overwritten.

Correct Answer: A. A. False
Explanation: Labeling suggests where the packet should be directed. Routing routes the data in the given direction. Thus, labeling technique is efficient and faster than the routing technique.

Correct Answer: B. B. Multiprotocol label switching
Explanation: Multiprotocol label switching (MPLS) was first proposed by CISCO systems. Earlier, it was called as tag switching. MPLS uses labels to forward, switch, designate the traffic.

Correct Answer: A. A. True
Explanation: MPLS is flexible in the current protocol landscape. It supports Ethernet, frame relay as a data link layer but is independent of layer 2 and 3 in the OSI model.