Questions & Answers of LAN Technologies (Ethernet)

Question No. 64

For a host machine that uses the token bucket algorithm for congestion control, the token bucket has a capacity of 1 megabyte and the maximum output rate is 20 megabytes per second. Tokens arrive at a rate to sustain output at a rate of 10 megabytes per second. The token bucket is currently full and the machine needs to send 12 megabytes of data. The minimum time required to transmit the data is __________ seconds.

Question No. 134

In an Ethernet local area network, which one of the following statements is TRUE?

Question No. 36

Consider a token ring network with a length of 2 km having 10 stations including a monitoring station. The propagation speed of the signal is 2 × 108 m/s and the token transmission time is ignored. If each station is allowed to hold the token for 2 μsec, the minimum time for which the monitoring station should wait (in μsec)before assuming that the token is lost is _______.

Question No. 135

In the diagram shown below,L1 is an Ethernet LAN and L2 is a token-ring LAN. AN IP packet originates from sender S and travers to R,as shown.the links within each ISP and across the twon ISPs, are all point-to-point optical links. The initial value of the TTL fields is 32.The maximum possible value of the TTL fields when R receives the diagram us _______.

Question No. 44

Consider a source computer (S) transmitting a file of size 106 bits to a destination computer (D) over a network of two routers (R1 and R2) and three links (L1, L2, and L3). L1 connects S to R1; L2 connects R1 to R2; and L3 connects R2 to D. Let each link be of length 100 km. Assume signals travel over each link at a speed of 108 meters per second. Assume that the link bandwidth on each link is 1Mbps. Let the file be broken down into 1000 packets each of size 1000 bits. Find the total sum of transmission and propagation delays in transmitting the file from S to D?

Question No. 19

In Ethernet when Manchester encoding is used, the bit rate is: