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1. a) A computer network can be designed following a connectionOriented architecture or a connectionless network architecture.

Suppose that in the network layer, routers are subjected to "stressful"

conditions that might cause them to fail fairly often. Explain the

actions that would need to be taken on such router failure at a high

level, and which architecture better suits such a network environment

b) Traditional IP network routing is time consuming. When managing an

IP network, for every packet at each routing node, it incurs four

delays – queuing delay, processing delay, transmission delay and

propagation delay. Of the four delays, explain which two delays are

hard to reduce and provide a mechanism that can possibly reduce

these two delays.

2. End-host A communicates with end-host B in a 100Mbps network. Assume

the shortest path between A and B has three Multi-Protocol Label

Switching (MPLS) routers and the minimum delay to establish a path is

0.15ms. Each packet has 512 bytes payload and 64 bytes header. Assume

there is no propagation delay from A to B. The minimum delay to label

the shortest path from A to B is 0.2ms. The delay to add a 32 bits label to

a packet and check a packet label is 0.01ms. Calculate the minimum delay

for transferring the 512KB file from A to B using the MPLS routers.

3. When designing a computer network in support of one-many

communication scenarios, IP multicasting is normally applied which can

be implemented with unicast emulation or network-layer multicast

scheme. Consider a single sender and 64 receivers. Suppose the sender

is connected to the receivers through a binary tree of routers. Each time a

packet (or copy of a packet) is sent over a single link, it incurs a unit of


a) Calculate the cost of sending a multicast packet in the case of unicast

emulation and network-layer multicast for this topology respectively.

b) Assess the complexities that IP multicast routing add to IP unicast

routing and the role that Reverse Path Forwarding (RPF) plays in IP

multicast routing.

4. Suppose that two Ethernet networks are interconnected through ATM

network using interconnecting devices as shown in Figure Q4-1.

The interconnecting device ID uses AAL5 in order to encapsulate

Ethernet frames. The format of Ethernet frame is shown in

Figure Q4-2 and the format of Adaptation Layer 5 packet (PDU,

protocol data unit) is given in Figure Q4-3. Assume that a TCP

application running on the host H1 sends two characters CR (carriage

return) and LF (line feed) to a TCP application running on the host


Calculate the number of ATM cells needed to transfer the TCP

segment carrying these two characters between H1 and H2. Assume

that the TCP header size is 20 bytes and the IP header size is 20

bytes. Determine the length of the padding in the Ethernet frame and

the padding length in the AAL5 PDU.

Kĩ năng: Computer Science, Network Security, Quản trị mạng, Điện tử, Network Engineering

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What format you require the answer in, in a statement/paragraph explainer form or a diagramic form because the time required for both varies a lot.

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Hi. Am Esther an electronics and computer engineering student. I have read and understood your project, I can deliver a thoroughly researched and highly informative answers to the questions you have posted. I am also a Thêm

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