SOLVED PAST PAPER COMPUTER NETWORKS 2016 QUESTION # 2: SHORT ANSWERS: 1). When a Frame arrives at a bridge, what decision is made by a bridge if: i. Source and Destination LANs are the same, ii. The Destination LAN is unknown. A: if the source and destination is same then it will discard and if the destination is unknown the attached LANs will broadcast. 2). Determine the Level of sensitivity (H or L) of each application in the following table for given parameters. Application Reliability Delay Jitter Bandwidth File Transfer Video on Demand A: Application Reliability Delay Jitter Bandwidth File Transfer HIGH LOW LOW MEDIUM Video on Demand LOW LOW HIGH HIGH 3). what is the minimum size of an Ethernet Frame and why? A: The original Ethernet IEEE 802.3 standard defined the minimum Ethernet frame size as 64 bytes and the maximum as 1518 bytes. An ether net frame has a minimum size because anything that is shorter than the 64 byte minimum is interpreted by receiving stations as a collision. ... This allows all receiving stations to interpret any transmission that is less than 64 bytes as a collision, and thus ignore it. OR The original Ethernet IEEE 802.3 standard defined the minimum Ethernet frame size as 64 bytes and the maximum as 1518 bytes . The maximum was later increased to 1522 bytes to allow for VLAN tagging. The minimum size of an Ethernet frame that carries an ICMP packet is 74 bytes . 4). Where ICMP protocol is used? A: ICMP is a layer 3 protocol that is network layer. ICMP (Internet Control Message Protocol) is an error-reporting protocol network devices like routers use to generate error messages to the source IP address when network problems prevent delivery of IP packets. ICMP (Internet Control Message Protocol) is an error-reporting protocol network devices like routers use to generate error messages to the source IP address when network problems prevent delivery of IP packets. The Internet Control Message Protocol (ICMP) is a supporting protocol in the Internet protocol suite . It is used by network devices , including routers , to send error messages and operational information indicating. While ICMP is not used regularly in end-user MUDDASIR MUGHAL (0321-1467372) 1 | P a g e
applications, it is used by network administrators to troubleshoot Internet connections in diagnostic utilities including ping and trace route . ICMP is used by routers, intermediary devices or hosts to communicate error information or updates to other routers, intermediary devices or hosts. The widely used IPv4 (Internet Protocol version 4) and the newer IPv6 use similar versions of the ICMP protocol (ICMPv4 and ICMPv6, respectively). It does not provide addressing or packet routing (it uses IP for this), so all it does is send information from one node to another node, like a transport protocol.
- Spring '17
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- Transmission Control Protocol, MUDDASIR MUGHAL