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EE5527 - Network Design and Management - IT/Computer Science Assignment Help

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Assignment Task

1. a) A computer network can be designed following a connection Oriented 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  "cost". 
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  H2.  
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. . 
5. Software defined networking (SDN) is emerging into an effective  networking scheme in support of dynamic and flow-based routing.  Figure Q5 shows an SDN architecture. 
Compared with traditional IP networks, critically assess the benefits of  SDN networks and two major challenges.

 

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  • Posted on : October 21st, 2018
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