Free 312-38 Exam Braindumps (page: 35)

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Which of the following is an exterior gateway protocol that communicates using a Transmission Control Protocol (TCP) and sends the updated router table information?

  1. IGMP
  2. IRDP
  3. OSPF
  4. BGP

Answer(s): D

Explanation:

Border Gateway Protocol (BGP) is an exterior gateway protocol. It communicates using a Transmission Control Protocol (TCP) and sends the updated router table information. The best path is chosen on the basis of cost metric associated with the route. It is used between gateway hosts in a network.
Answer option C is incorrect. Open Shortest Path First (OSPF) is a routing protocol that is used in large networks. Internet Engineering Task Force (IETF) designates OSPF as one of the Interior Gateway Protocols. A host uses OSPF to obtain a change in the routing table and to immediately multicast updated information to all the other hosts in the network.
Answer option A is incorrect. IGMP stands for Internet Group Management Protocol. IGMP is a communication protocol that is used to manage the membership of Internet protocol multicast groups. It is an integral part of the IP multicast specification. Although it does not actually act as a transport protocol, it operates above the network layer. It is analogous to ICMP for unicast connections. It is susceptible to some attacks, so firewalls commonly allow the user to disable it if not needed.
Answer option B is incorrect. ICMP Router Discovery Protocol (IRDP) uses Internet Control Message Protocol (ICMP) router advertisements and router solicitation messages to allow a host to discover the addresses of operational routers on the subnet. It basically consists of 2 message types used for discovering local routers. The message type 9 is sent periodically or on request (using a message of type 10) to the local subnet from the local routers to propagate themselves. On boot, the client may send an ICMP message of type 10 to ask for local routers. When a client receives a message type 9, they add the router to their local routing-table.



Which of the following statements are true about a wireless network?
Each correct answer represents a complete solution. Choose all that apply.

  1. Data can be shared easily between wireless devices.
  2. It provides mobility to users to access a network.
  3. Data can be transmitted in different ways by using Cellular Networks, Mobitex, DataTAC, etc.
  4. It is easy to connect.

Answer(s): A,B,C,D

Explanation:

The advantages of a wireless network are as follows:
It provides mobility to users to access a network. It is easy to connect.
The initial cost to set up a wireless network is low as compared to that of manual cable network. Data can be transmitted in different ways by using Cellular Networks, Mobitex, DataTAC, etc. Data can be shared easily between the wireless devices.



DRAG DROP (Drag and Drop is not supported)
Drag and drop the terms to match with their descriptions.

Select and Place:

  1. See Explanation section for answer.

Answer(s): A

Explanation:




Following are the terms with their descriptions:



Which of the following is a device that receives a digital signal on an electromagnetic or optical transmission medium and regenerates the signal along the next leg of the medium?

  1. Gateway
  2. Repeater
  3. Network adapter
  4. Transceiver

Answer(s): B

Explanation:

A repeater is an electronic device that receives a signal and retransmits it at a higher level and/or higher power, or onto the other side of an obstruction, so that the signal can cover longer distances. A repeater is a device that receives a digital signal on an electromagnetic or optical transmission medium and regenerates the signal along the next leg of the medium. In electromagnetic media, repeaters overcome the attenuation caused by free-space electromagnetic-field divergence or cable loss. A series of repeaters make possible the extension of a signal over a distance. Repeaters remove the unwanted noise in an incoming signal. Unlike an analog signal, the original digital signal, even if weak or distorted, can be clearly perceived and restored. With analog transmission, signals are restrengthened with amplifiers which unfortunately also amplify noise as well as information. An example of a wireless repeater is shown in the figure below:

Answer option D is incorrect. A transceiver is a device that has both a transmitter and a receiver in a single package.
Answer option A is incorrect. A gateway is a network interconnectivity device that translates different communication protocols and is used to connect dissimilar network technologies. It provides greater functionality than a router or bridge because a gateway functions both as a translator and a router. Gateways are slower than bridges and routers. A gateway is an application layer device.
Answer option C is incorrect. A network adapter is used to interface a computer to a network. "Device driver" is a piece of software through which Windows and other operating systems support both wired and wireless network adapters. Network drivers allow application software to communicate with the adapter hardware.
Network device drivers are often installed automatically when adapter hardware is first powered on.






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