Review Questions 1.2

Front 1

Question 1What is attenuation?

Back 1

The loss of signal strength that occurs as the signal travels through the media.

Front 2

Question textTrue or false? Digital signaling is typified by sending a stream of discrete pulses.

Back 2

True - digital signaling is typified by pulses; analog by a continuously varying wave.

Front 3

Question textWhat are multiplexing and

de-multiplexing?

Back 3

Multiplexing means sending multiple channels on a circuit at the same time as one complex signal. De-multiplexing is the process of separating the channels at the receiving end.

Front 4

Question textWhy might the baud rate be different from the bit rate?

Back 4

Baud is the number of symbols measured in Hertz; bit rate is the amount of information, measured in bits per second. A signaling technique might encode more than one bit per symbol.

Front 5

Question textWith CSMA/CD, what will happen if a computer has data to transmit and there is already data on the cable?

Back 5

The computer will wait until the cable is clear to transmit the data.

Front 6

Question textWhat is an MTU?

Back 6

Maximum Transmission Unit - the amount of data that a frame payload can carry.

Front 7

Question textTrue or false? The CRC mechanism in Ethernet allows for the retransmission of damaged frames.

Back 7

False. The CRC only indicates that a frame may be corrupt.

Front 8

Question textWhich Ethernet standard uses coaxial cabling?

Back 8

10BASE-2 (and 10BASE-5).

Front 9

Question textTrue or false? A computer with a 10BASE-T Ethernet adapter cannot be joined to a 100BASE-T network.

Back 9

False - Fast Ethernet is backwards-compatible with 10BASE-T (and Gigabit Ethernet is backwards-compatible with Fast Ethernet).

Front 10

Question textWhat is an I/G bit?

Back 10

Determines whether a frame is addressed to a single node (0) or group (1). The latter is used for multicast and broadcast.

Front 11

Question textIf a mapping for a local destination host is not found in a source host ARP cache, how does the source host send an ARP request?

Back 11

As a broadcast to all local hosts.

Front 12

Question textIf a packet is addressed to a remote network, what destination MAC address will the sending node use?

Back 12

The MAC address of the default gateway.

Front 13

Question textTrue or false? The arp utility allows you to discover another host's MAC address.

Back 13

Partially false - while that is the function of the Address Resolution Protocol, the arp utility is used to inspect the arp cache table, which may or may not contain the other host's address. A standard means to ensure the MAC address is cached is to ping the destination address first (the basis of the arping utility).

Front 14

Question textOn a switched network, what configuration changes must be made to allow a host to sniff unicast traffic from all hosts connected to a switch?

Back 14

The network adapter must be put in p-mode (promiscuous mode) and the switch must be configured to mirror traffic to the sniffer's port.