Suppose a router has built up the routing table shown in Table below. The router can deliver packets directly over interfaces 0 and 1, or it can forward packets to routers R2, R3, or R4. Describe what the router does with a packet addressed to each of the following destinations (see Attachment)
1. K is identical shared-medium CSMA/CD LANs are bridged together with K-1 bridges in a linear configuration. Each LAN has the same physical length L in meters and propagation speed is V m/s. The maximum number of nodes on each segment is N, and the maximum transmission rate is R bps. a. Which of these five parameters (K, L,V,N ...continues
Host A digitizes real time speech by sampling at a rate of 8 Khz, and converting each sample on-the-fly to a 8 bit representation. As soon as 48 bytes of digitized speech have been collected, A immediately adds a 5 byte header to form a packet and starts transmitting the packet at a rate of 128Kbps to Host B. (At the same time i ...continues
A two-port bridge connects on end of cable of length X m. to on end of a similar cable of length 3x/2 m. Hosts are attached at various points on the cable system, which operates as a shared-access LAN implementing the CSMA/CD protocol with a minimum frame length of 512 bits. The bridge imparts a delay in forwarding frames that ...continues
An organization owns the network 200.1.1.0/24 and wants to form subnets for 4 departments, with hosts as follows: A 72 hosts B 35 hosts C 20 hosts D 18 hosts There are 145 hosts in all. a. Give a possible arrangement of subnet masks to make this possible. b. Suggest what the organization might do if department D g ...continues
1. A user message is split into 15 frames, each of which has an 80% chance of arriving error-free. If no error control is used by the data link layer, how many times must the message be sent on the average to get the entire message through? 2. A communication channel has a bit rate of 14 kbps and an one-way propagation delay ...continues
1. For a 10Gigabit network operating over 4,000 km, the delay becomes the limiting factor, rather than the bandwidth. Consider a MAN with the average distance (between the source and destination) of 20 km. At what rate does the round-trip delay due to the speed of light equal the transmission delay for a 1,000-byte packet? ...continues
1. ATM networks use a token bucket scheme to regulate traffic (traffic shaping). A new token is put into the bucket every 1 usec so ATM cells can be sent during this period. The data payload of ATM cells is 48 bytes. What is the maximum sustainable net (or effective) data rate? 2. A bridge between an 802.3 LAN and an 802.4 ...continues
1. A company needs to provide sufficient private trunks between two switches to accommodate 90% of call attempts among employees during the busy hour. Assume that there will be 560 callers at random times during that hour, and that call duration averages 3 minutes. Employees are instructed to attempt to call using a trunk; if ...continues
In order to delimit messages from a stream of bits being exchanged on a data link, a sender marks the beginning and end of each message with a control flag. In order to prevent the receiver from inadvertently detecting the end of a message when a pattern in the data matches the control flag, the sender stuffs extra bits or c ...continues
