0 — Test 318

Correct Answer: B. B. Wide area network
Explanation: WAN is the abbreviation for Wide Area Network. This network extends over a large geographical area. These are used to connect cities, states or even countries. They can be connected through leased lines or satellites.

Correct Answer: B. B. Frames
Explanation: TDM is the abbreviation for Time division multiplexing. It is technique for combining several low rate channels to a single high rate channel. For a certain time slot, the several channels could use the maximum bandwidth. Each channel is inactive for a period of time too. Some other multiplexing techniques are Frequency division multiplexing and Phase division multiplexing.

Correct Answer: A. A. Fdm
Explanation: FDM is an abbreviation for Frequency Division Multiplexing. This technique is used when the bandwidth of the channel is greater than the combined bandwidth of all the signals which are to be transmitted. The channel is active at all times unless a collision occurs with another channel trying to use the same frequency. Some other multiplexing techniques are Time division multiplexing and Phase division multiplexing.

Correct Answer: D. D. Logical address
Explanation: MAC(media access control)address will be assigned to NIC(Network Interface Controller). These addresses are assigned by the manufacture of those particular devices and are unique. Logical address is the IP address of the network.

Correct Answer: B. B. 48 bits
Explanation: MAC address is a 48 bit with 6 octets and can be represented as EUI-48. As MAC address is a 48 bit space, 248 MAC addresses are possible. Non-Ethernet applications can have EUI-64 address.

Correct Answer: D. D. Dollar($)
Explanation: These separators are chosen by manufacturer, who manufactures the device. Hyphen is used by MICROSOFT, period(.) is used by CISCO, colon(:) is used by LINUX. Dollar is not used as a separator.

Correct Answer: C. C. . the mac address has total of 6 octets and each octet has 8 bits that is 2 hexadecimal numbers(48bits).
Explanation: IP address is represented in decimals (10.10.25.44), whereas, MAC address is represented in hexadecimal(60-30-74-00-ED-FC). The MAC address has total of 6 octets and each octet has 8 bits that is 2 hexadecimal numbers(48bits).

Correct Answer: C. C. Security
Explanation: MAC filtering allows only approved MAC addresses to send traffic in the network. It provides security, even if hacker hijacks the IP address. Because, the hacker will not be allowed into network without approved MAC address.

Correct Answer: D. D. Multiple cast mac address
Explanation: MAC address can be UNICAST, MULTICAST or BROADCAST. If LSB(least significant bit) is zero(0) of first octet of the MAC address, then it is uni-cast. LSB is one(1) for multicast and one(1) in all bits of the address is broadcast.

Correct Answer: D. D. Both operates on data link layer
Explanation: MAC addresses are used by the switch in the data link layer, whereas IP addresses are used by the router in network layer. IP address will change depending upon network in which the device is present but, MAC address is constant.