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ECE 3325 (EXAM 1) 2

QuestionAnswer
A cable TV system has 100 commercial channels, all of them alternating programs with advertising. Is this more like TDM or like FDM? TDM & FDM
Can a station using QAM-16 send 3 bits per symbol? True
Consider a router with multiple ARP tables, one for each of its interfaces. No two of these ARP tables can contain the same LAN address. True
Each LAN adapter has a unique LAN address. True
How many frequencies does a full-duplex QAM-64 modem use? Two, one for upstream and one for downstream. The modulation scheme itself just uses amplitude and phase. The frequency is not modulated.
n a typical mobile phone system with hexagonal cells, it is forbidden to reuse a frequency band in an adjacent cell. If 840 frequencies are available, how many can be used in a given cell? Each cell has six neighbors. If the central cell uses frequency group A, its six neighbors can use B, C, B, C, B, and C, respectively. In other words, only three unique cells are needed. Consequently, each cell can have 280 frequencies.
Is the Nyquist theorem true for high-quality single-mode optical fiber or only for copper wire? Optical Fiber and Copper Wire
The entries in a switch table need to be configured by the network administrator. False
Which are the advantages of fiber Optics over copper as a transmission medium? handles much higher bandwidth than copper thin and lightweight, resulting in much lower installation costs. It does not leak light and is quite difficult to tap. not affected by power surges, EM interference, power failures, corrosive chemicals
Why has the PCM sampling time set at 125 µsec? According to the Nyquist theorem, this is the sampling frequency needed to capture all the information in a 4-kHz channel, such as a telephone channel. A sampling time of 125 µ sec corresponds to 8000 samples per second.
A channel partitioning protocol has which of the following characteristics: it does not generate collisions. All transmitting nodes get the same amount of bandwidth. There is no master node.
All link layer protocols that support IP have the same frame structure (i.e., length of frame, number and length of header fields). False
CRC error detection, as used in Ethernet, is always able to detect whether there is an error in a frame. False
Data link protocols always put the CRC in a trailer rather than in a header. True
Ethernet uses a preamble in combination with a byte count to separate the frames. If a user tries to send data that contains this preamble the frame will be discarded. False
The bit in the lower-right corner is a parity bit that checks its row and its column. Will this scheme detect all single bit errors? Yes, A single error will cause both the horizontal and vertical parity checks to be wrong.
One way of detecting errors is to... transmit data as a block of n rows of k bits per row and add parity bits to each row and each column.
The bit in the lower-right corner is a parity bit that checks its row and its column. Will this scheme detect all double bit errors? Yes, Two errors will also be easily detected. If they are in different rows, the row parity will catch them. If they are in the same row, the column parity will catch them.
The bit in the lower-right corner is a parity bit that checks its row and its column. Can this scheme correct single bit errors? Yes, A single error will cause both the horizontal and vertical parity checks to be wrong and can be easily corrected.
The bit in the lower-right corner is a parity bit that checks its row and its column. Can this scheme correct double bit errors? No, Two errors will also be easily detected. There may be a row or a column with errored bits that does pass the parity check. In those cases it will not be possible to determine which bits are errored.
Which of the following statements is true about channel partitioning protocols? Can be times when the channel is idle, when a node has a frame to send, but is prevented from doing so by the medium access protocol.
Which of the following statements is true about channel partitioning protocols? Channel partitioning protocols can achieve 100% channel utilization, in the case that all nodes always have frames to send.
All link layer protocols that support IP have the same frame structure (i.e., length of frame, number and length of header fields). False
An ARP query packet is encapsulated in a link-layer broadcast frame
Consider a router with multiple ARP tables, one for each of its interfaces. No two of these ARP tables can contain the same LAN address. True
How can scheme correct double bit errors If different rows, row parity will catch them. If same row, the column parity will catch them.
Each LAN adapter has a unique LAN address. True
Ethernet provides which of the following services to the network layer: error detection
For Ethernet, if an adapter determines that a frame it has just received is addressed to a different adapter: it discards the frame without sending an error message to the network layer
In the Ethernet CSMA/CD protocol, suppose a node constructs a frame and then senses the channel as busy. Then... the adapter waits until it senses the channel idle and then begins to transmit the frame.
The entries in a switch table need to be configured by the network administrator False
What is the maximum number of VLANs that can be configured on a switch supporting the 802.1Q protocol? The VLAN tag field is 12 bits, therefor 2^12 = 4096
What type of address is the destination address in an ARP query? broadcast
When a switch transmits an Ethernet frame, the Ethernet frame has none of the below: (the broadcast address for the its source address the swtitch's LAN address for its destination address the swtitch's LAN address for its source address)
Created by: DylanCanalesMane
 

 



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