Testing And Troubleshooting Sequences For ICMP

Discuss about the Testing and Troubleshooting Sequences for ICMP.

IP Routing and Frame Forwarding Process that Delivers ICMP

In network communication, the key elements needed for communication to get successfully send it calls for a sender, communication medium, a protocol and the receiver (Alani & Mohammed, 2014). Consequently, some of the activities that occur at the sender point (named PC-1) include:

• The message that is to be conveyed begins its journey at the application layer, for example, a browser or an email which finds its path downwards.
• The packet then proceeds to the TCP layer where it is assigned a port number. The assigning of a port number is significant in the sense that here program uses TCP stack while sending messages (Sriramoju, 2017). The assigning of port number allows unique identification of the program whose port is listed. In this case, the port number is assigned number 1020.
• When the packet goes through the TCP protocol, it passes through the IP layer. The IP layer then assigns this packet its destination. For instance, a packet passing through PC-1 moving towards a remote server will have to be assigned both a port number and an IP address. After the packet is assigned a port number and IP address, it is ready to be conveyed over the Internet. The packet is then converted into electronic waves using the data link and physical layer and then forwarded to the wide area network (WAN) (White, 2015).
• To the receiving end of the WAN link, an IPS router does routing activities to determine the destination address and then forward the packet to the right final device.
• Lastly but not least, in the final stage, the packet arrives at a remote server where it is received at the lower end of the TCP stack where it has to move uphill (Goransson, et al., 2014). During this period of moving up the rioting information attached to the packet is extracted. Therefore, when the packets arrive at the TCP stack top, they are assembled into the original message.

The router follows the following process to keep on track the incoming and outgoing traffic

Once the packet has arrived at the router from the switch, the router removes layer two header information such as the MAC address which is contained in the packet and then determines the destination IP address for the packet. Consequently, the router then finds a route for the destination prefix by looking for a prefix which matches by assigning it an interface as the exit MAC address which appears at the source address. After that, the packet is forwarded to the exit interface (Grimes, 2016). When there is no route found in the routing table, the packet in transit is dropped. In this case, the routing table is illustrated below.

IP routing and frame forwarding process that delivers ICMP. The process goes through the following stages:

• PC-A send a ping request to 10.4.59 255.255.255.224
• The address resolution protocol works together with the IP to come up with a decision that ping request shall be forwarded, which is attained through identifying the IP address and providing a mask to PC-A workstation (Lammle & Swartz, 2013). The packet is then conveyed to the router for it to be directed to the right remote network workstation Management.
• When PC-A has been assigned a packet to the router, it has to identify the MAC address of the interface of the router which is directly linked to the network.
• The router has to distinguish the sent IP address for it to be able to respond to it. Afterward, the router will then send back a response to PC-A. This takes some time for ARP to deliver the information and ask the receiving device to give a response (Carrell et al., 2013). At a given point, TTL decrements to zero which means that the ping request time has expired.
• The router will then give a response with its physical address interface that links the network segment. The PC then complete the needed to be transmitted to the local router externally. The network layer will then assign the packet to the data link layer where at this point the packet containing ICMP will create a request (Pyles et al., 2016). Indeed, this packet comprises a destination address, ping ECHO request, and an IP for the source.
• The data link layer for PC-A will create a frame which comprises a source MAC address, and destination address. A Cyclic redundancy check is attached to ascertain that the destination workstation drops the frame in case it is destroyed.
• The physical layer receives the frame from the data link layer and then convert the frame from zeros to ones which are referred to as a digital signal to enable it to leave the physical layer.
• The physical layer router then receives the frame and check it to determine if there are any errors in the frame.
• At this point, the destination for the physical address has been established. Therefore, the router will have to submit the packet to the IP. The PC-A’s MAC address is then stored in the router’s memory routing table.
• The IP search for the destination IP address to decide if the packet belongs to a destination router.
• The router shall be required to construct a frame which forwards it to PC-B, in this case, the destination.
• The destiny device will the reply using its physical address and the ARP response for the router to have acquired all the necessities for it to respond.
• The destination PC-B collects the frame where the PC carry out CRC checks to determine whether there are any forms of errors. If the frame matches with the PC-B frame, it indicates that there are no errors(Bosworth, et al., 2012), therefore, the protocol can decide the following packet.
• The destiny PC-B generate a new response PING response packet. Certainly, the response echo will comprise the destination address and source address enabling for the protocol to begin its journey all the way towards the other end.
• Demonstration: EIGRP, OSPF, and RIP deploy classes addressing. In a classless routing, subnet masks of a network are sent with its updates to enable VLSM masks. In this case of this scenario, our network segment A and B are interconnected. The masks are given as 255.255.255.0, right? Therefore, in the case of a classful rioting protocol being adopted, these network segments have to take their default subnet masks as 255.255.0.0 while the other will take 255.0.0. The subnet mask, which interprets that wrong information will be routed. When using a classful protocol, it is advisable to ensure that the subnet mask remains consistent throughout the entire network.
• The network address could be 10.10.10.0 in the WAN interface and 172.16.10.0 on the Fa0/0 interface of the router on the left-hand side and 172.16.20.0 on the right-hand side.
• A merging parameter is essential at the time of routing. In the case of the case mentioned above, OSPF will merge faster than to other routing protocols because OSPF aspects allow small areas to assemble as individuals and their groups are taken as a spate network by its own (Clarke, 2012).

The stop and wait to work together using automatic repeat query is defined as a control procedure that is integrated to stop and wait for control flow protocol. In case of experiencing an error at the receiving end, the message is discarded and send a NAK requesting to resend the message again (Oriyano, 2014). When the message fails to reach the recipient, the sending will often set a timer whereby at any point a frame is sent, a timer clock is set despite the any NAK acknowledgment received or not, a frame is automatically resent once more. Nonetheless, the timer introduces a challenge. For instance, the sending end can do retransmission yet the recipient has already received the frame, which results in a duplicate to the receiving end. Thus, to avoid such cases, frames and acknowledgments are put into groups for instance frame as zeros and acknowledgment as ones (Viswanathan, et al., 2014).

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Clarke, G. E., 2012. CompTIA Network+ Certification Study Guide, 5th Edition (Exam N10-005). New York: McGraw Hill Professional.

Goransson, Paul, Black & Chuck, 2014. Software Defined Networks: A Comprehensive Approach. Edinburgh: Elsevier.

Grimes, B., 22 Apr 2016. CTS-D Certified Technology Specialist-Design Exam Guide. Pennsylvania Plaza New York City: McGraw Hill Professional.

Lammle, T. & Swartz, J., 2013. CCNA Data Center - Introducing Cisco Data Center Networking Study Guide. Hoboken: John Wiley & Sons.

Oriyano, 2014. Dissecting the TCP/IP Suite. In: CEH: Certified Ethical Hacker Version 8 Study Guide. Hoboken: John Wiley & Sons, pp. 33-34.

Pyles, J., Carrell, J. L. & Tittel, E., 2016. Testing and Troubleshooting Sequences for ICMP. In: Guide to TCP/IP: IPv6 and IPv4. Boston: Cengage Learning, p. 286.

Sriramoju, S. B., 2017. Basic Dataflow. In: NTRODUCTION TO BIG DATA: INFRASTRUCTURE AND NETWORKING CONSIDERATIONS. s.l.:Horizon Books ( A Division of Ignited Minds Edutech P Ltd, pp. 72-74.

Viswanathan, Hiagarajan, Bhatnagar & Manav, 2014. Telecommunication Switching Systems and Networks. In: Telecommunication Switching Systems and Networks. s.l.:PHI Learning Pvt. Ltd, pp. 433-436.

White, C., 2015. Data Communications and Computer Networks: A Business User's Approach. Belmont: Cengage Learning