Local Area Networks — Test 1

Correct Answer: B. B. False
Explanation: A local area network (LAN) is a private network. It is limited to a specific area. WAN on the other hand is used for extremely large geographical areas.

Correct Answer: C. C. Unshielded twisted pair
Explanation: There are several types of cables used in LAN. The most commonly used cables for transmission channels in LAN are UTP (Unshielded Twisted Pair) due to their low cost and ease of installation.

Correct Answer: B. B. Ieee 802.11
Explanation: IEEE 802.11 specifies the set of protocols for implementing Wireless LAN (WLAN). IEEE 802.3 standard is for bus networks. IEEE 802.3 standard defines the MAC layer and Physical layer of the Ethernet. Hence it forms the foundation for the specification of Ethernet protocol. IEEE 802.2 standard is used for specifying logical link control above the Data Link Layer of the OSI model. IEEE 802.5 standard is used for Token-ring topology.

Correct Answer: C. C. Bluetooth
Explanation: Bluetooth is one example of Wireless LAN technology that is used for exchanging data over short distances. It also provides secure wireless communications. PSTN, Cable Television and Internet Access are wired technologies.

Correct Answer: D. D. Token ring
Explanation: Token Ring Technology gives specifications for communication protocols in LANs. This technology is more deterministic than Ethernet. It uses Ring topology. This is the only option referring to a technology whereas Hybrid, Fully Connected and Mesh refers to Network topologies.

Correct Answer: A. A. Unshielded twisted pair (utp)
Explanation: 100BaseT4 is one of the three types of Ethernet cable. These physical wiring can carry up to 100 Mbps. 100BaseT4 networks uses Star topology for its connections.

Correct Answer: B. B. False
Explanation: Collision detection is a process that helps in detecting the collision/interference of two data packets in a network. Thus CSMA/CD (Carrier Sense Multiple Access/Collision Detection) is method used for the same in LANs. Whereas CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) is used for avoiding or preventing those collisions.

Correct Answer: B. B. Unicast
Explanation: Data transmission in LAN comes under three types. Those are unicast, multicast, and broadcast. The data packets are sent in the form of a network frame to a node and further it is transmitted on the basis of topology.

Correct Answer: D. D. Physical
Explanation: In an extended network repeaters are used to connect media elements. These repeaters operate on the physical layer of the OSI model. It removes noise from a signal.

Correct Answer: D. D. A single packet is copied and sent to all nodes on the network
Explanation: In LANs the data transmission methods are classified into three types. Those are unicast, multicast, and broadcast. In unicast, a frame is sent from one node to another on a network. In broadcast, a frame or data packet is transmitted from one node to all other nodes on the network. Lastly, in a multicast, the frames are carried in a network to many receivers at the same time.