4 questions for networking

ASSIGNMENT 2 Computer Networks This assignment comprises of 4 questions worth 25 marks each, based on the work you have completed in the Networking laboratory exercises. Some questions may also require you to carry out further research to give complete answers. Insert annotated printouts of protocol decode traces, flow graphs or other diagrams (as required) clearly indicating which question they refer to. Full marks will be awarded for answering all 4 questions. Submit at Reception by 10am 1st May 2013 PROVISIONAL 1. This question relates to lab1: ‘Lab intro and Ethernet LAN’. (a) (i) State the MAC address (in hex) of the network card you used in the lab exercises and identify the significance of the left-most three bytes. (ii) With the aid of a diagram distinguish between Ethernet II and IEEE 802.3 frames. (iii) Summarise the meaning of the physical interface designation 10/1001000BASET of the Intel Pro interface cards you used in the lab programme. (iv) State the command (entered at the command line of a Windows 7 workstation) that will map a local drive z: to a share called utils on a computer called Server 1 (8 marks) (b) (i) Draw in the links necessary to connect the four hubs shown in Figure Q1b via a central switch if only 3 straight through UTP cables are available and one crossover cable - the switch does not have a crossover port or auto cable sensing. (ii) State the two main functions of a switching hub (Ethernet switch) and explain what might happen if you connect a crossover cable between two ports on a non IEEE 802.1d compliant switch: (iii) Submit a screenshot of the Packet Tracer simulation of the switch LAN showing a unicast packet sent between PC0 and PC2 including OSI layer functions. (9 marks) (c) (i) Figure Q1c shows the packets captured with Wireshark when a host computer was Pinged by its NetBIOS name. Explain the purpose of the first 4 packets. (ii) Distinguish between unicast transmission as used by...