Computer Networks — Test 9

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.

Correct Answer: B. B. Nic
Explanation: NIC(network interface card) knows only about MAC address which is embedded in it. It doesn’t know about IP address and it is the only hardware in the device which is aware of network communication.

Correct Answer: B. B. 3
Explanation: OUI is the address that is universally administered and identifies the the device uniquely. Out of six octets, three octets are used to identify the OUI, that to which organization it belongs.

Correct Answer: B. B. False
Explanation: A network node can have number of MAC addresses based on the number of interfaces. Network node has unique MAC address for each interface(NIC). But it is possible for two NICs to share MAC address, which are connected to different networks.