Computer Networks — Test 5

Correct Answer: D. D. Ethernet
Explanation: In a star network a number of devices and actuators are connected to a central hub. An advantage of Star topology is that data can be transferred using a simple serial communication protocol. Thus Ethernet is the protocol that makes this advantage possible.

Correct Answer: B. B. False
Explanation: Linear network topology such as Bus topology is not expensive than other topologies. It requires less cable than Star topology. It is also easy to install computers and other devices in Linear network topology.

Correct Answer: D. D. Hybrid topology
Explanation: A hybrid topology is a type of network topology that combines two or more different network topologies e.g. star, mesh, bus and star topology. Hybrid topology helps is increasing the signal strength.

Correct Answer: A. A. True
Explanation: FDDI is a standard developed for transmitting data on optical fibers. It uses a dual ring configuration. Thus, FDDI can cover much larger geographical area than Token Ring on copper. It also has high bandwidth.

Correct Answer: D. D. Mesh, tree
Explanation: The topologies used for a WAN depends on its business requirements, physical constraints and cost/benefit ratio. The commonly used topologies for a WAN are hub-and-spoke, partial mesh, full mesh and ring.

Correct Answer: A. A. Fiber distributed data interface
Explanation: Fiber Distributed Data Interface (FDDI) is a set of ANSI (American National Standards Institute) protocols. FDDI acts as a backbone network for WANs. It also provides high bandwidth for transmission of digital signal data through optical fiber cable.

Correct Answer: B. B. Ieee 802.3 standard
Explanation: 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 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. IEEE 802.11 specifies the set of protocols for implementing Wireless LAN (WLAN).

Correct Answer: B. B. False
Explanation: WAN differs from LAN in that it links networks that are geographically separated by a long distance. Typically, the WAN link connects nodes made up of switches, bridges and routers.

Correct Answer: D. D. Header
Explanation: A Tree Structure or topology is a hierarchical way of representation of devices in a network. It comprises of a parent node and several child nodes. These are branched out from the parent node. This parent node which forms the origin of the structure is known as Header node.

Correct Answer: A. A. In one direction only
Explanation: A circular data path is created in a Ring topology. In this type of topology, the data packets travel from one device to the next until they reach their destination. Each device in this topology is connected to two other devices but they are not interconnected. This is the reason for data to travel in a single direction.