Network Troubleshooting Exam 212-82 PDF

Certified Cybersecurity Technician Network Troubleshooting Exam 212-82 Module Flow Learn Troubleshooting Basic Network Issues using Utilities and Tools Discuss Network Troubleshooting This section discusses resolve them. Module 16 Page 1926 common network issues and various troubleshooting technique...

Certified Cybersecurity Technician Network Troubleshooting Exam 212-82 Module Flow Learn Troubleshooting Basic Network Issues using Utilities and Tools Discuss Network Troubleshooting This section discusses resolve them. Module 16 Page 1926 common network issues and various troubleshooting techniques to Certified Cybersecurity Technician Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited. Certified Cybersecurity Technician Exam 212-82 Network Troubleshooting Troubleshooting O Troubleshooting is the process of finding issues in a computer network and diagnosing them Typical Network Issues ' © 4\ Configuration Issues » Network connectivity issues due to faulty or loose connection of cables » Network failure or faulty configuration of ports or interfaces in LAN and WAN, » which may affect the connectivity to the host server Q Software Issues » Incompatible software and version mismatch, leading to disruptions of the transmission of IP data packets between the source and destination result in communication failure Q » Network behavior changes when traffic exceeds the capacity of the network devices Misconfiguration of DHCP and DNS settings, causing routing issues that » Network IP Issues Improper IP settings, subnet mask, and routing at the source, resulting in the interruption of communication with the destination IP Troubleshooting Troubleshooting is the process executed by network engineers/administrators to find issues in a computer network and diagnose them to enhance the network performance. It comprises systematic measures and processes to identify, diagnose, and resolve network issues to recover normal network operations on end nodes. Troubleshooting is primarily performed by network engineers/administrators. The process of troubleshooting can be performed manually or by using automated tools (network diagnostic software). Some of the processes involved in network troubleshooting are as follows: * Finding and resolving the faulty network connection of a system = Configuring network devices (routers, switches, etc.) = |nstalling physical equipment (cables, Wi-Fi devices, etc.) = Updating firmware devices = Removing viruses using antivirus software = Adding, configuring, and reinstalling devices Typical Network Issues The issues that generally occur in a network are as follows: = Physical connection issues: These issues occur due to faulty, shortened, or damaged cables in a network. For example, cut cables, incorrect cable connections, and connector problems may result in poor network connectivity. Module 16 Page 1927 Certified Cybersecurity Technician Copyright © by EG-Council All Rights Reserved. Reproduction is Strictly Prohibited. Certified Cybersecurity Technician Network Troubleshooting * Exam 212-82 Connectivity issues: These issues are caused by faulty/physical shutting down port or interface on which devices are connected in a LAN or WAN. of the For example, the malfunction of a hub, router, or switch may affect the network connectivity with the host server. = Configuration issues: These issues occur due to the faulty configuration of DHCP and DNS settings, routing issues, IP looping, etc. and may result in communication failure. = Software issues: These issues are caused by software compatibility issues and mismatched software versions. These may result in the interruption of the transmission of IP data packets between the source and destination. = Traffic capacity overload issues: of a network These device. issues occur For example, due to traffic that transfers of an exceeds excessive the normal amount of information due to a poor network setup may result in abnormal network behavior or slow connectivity. * Network IP issues: These issues are caused by the faulty configuration of IP addresses, subnet masks, and routing at the source and may result in interruption in reaching the destination IP through the network. Module 16 Page 1928 Certified Cybersecurity Technician Copyright © by EG-Council All Rights Reserved. Reproduction is Strictly Prohibited. Certified Cybersecurity Technician Network Troubleshooting Exam 212-82 Basic Network Issues: Unreachable An ICMP destination unreachable message is sent in the case of the following: Echo Request/Reply When host is up BN C:AWINDOWS\system32\emd.exe v The host or port is unreachable Microsoft Windows [Version 10.0.18362.778] (c) 2019 Microsoft Corporation. All rights v The network is unreachable C:\Users\Martindping I do not know how togetto Z| Send ICMP D O Networks 10.10.10.16 Pinging 10.10. Reply from 10.10.10. Reply from 10,10,10,16: 'ply from 10.10.10,16: Reply from 10.10.10.16: 25 by by / 32.10.10.16: 4, Received es fenined Toz reserved. 2 t = TTL=128 TTL-128 TTL=128 TL=128 m tim 4, in mill Lost = cvsrennnnend § Echo = Type 8; Echo Reply = Type 0 Copyright © by EC-Councll. All Rights Reserved. Reproductions Strictly Prohibited Basic Network Issues: Unreachable Networks Network communication depends on certain basic conditions being met. » = Sending and receiving devices must have the TCP/IP protocol stack properly configured: o The IP address and subnet mask must be properly configured. o A default gateway must also be configured if datagrams are to travel outside of the local network. Arouter must also have the TCP/IP protocol stack properly configured on its interfaces, and it must use an appropriate routing protocol. = |f these conditions are not met, then network communication cannot occur. = The following are examples of problems: = o The sending device may address the datagram to a non-existent IP address. o The destination device is not connected to its network. o The router’s connecting interface is down. o The router does not have the information necessary to find the destination network. An ICMP destination unreachable message is sent in the case of the following issues: o Host or port unreachable o Network unreachable Module 16 Page 1929 Certified Cybersecurity Technician Copyright © by EG-Council All Rights Reserved. Reproduction is Strictly Prohibited. Certified Cybersecurity Technician Network Troubleshooting Exam 212-82 Sond data to Z | do not know how tc:iget to Z! Send Data ICMP Network A. || S QD e : | |A : A E :--o-----) Ceanann Toz assssssssens Destination Unreachable g ping Pinging 10.10.160. Reply from 10.10. Reply from 10.10. Reply from 10.10. Reply from 10.10. Ping statistics Packets: Approximate Minimum 16 10. 10. 10. 10. for Sent round = ©ms 10.10.10.16 with 32 bytes of data: 16 : bytes=32 time=1ms TTL=128 1 [} bytes=32 time_ Figure 16.7: Echo Request/Reply When host is down Module 16 Page 1932 Certified Cybersecurity Technician Copyright © by EG-Council All Rights Reserved. Reproduction is Strictly Prohibited.