Network Troubleshooting

Question 1

Describe these Typical Network Issues:
1) Physical Connection
2) Connectivity
3) Configuration
4) Software
5) Traffic Overload
6) Network IP

Answer 1

1) Due to faulty or loose connections
2) Network failure or faulty configs of ports and interfaces.
3) Misconfiguration of DHCP or DNS, causing routing issues.
4) Incompatible software and version mismatch. Causes disruption of IP packet between source and destination.
5) Network behaviour changes when traffic exceeds capacity.
6) Improper IP settings, subnet mask, and routing at the source.

Question 2

Describe these Basic Network Issues:
1) Destination Unreachable
2) Time Exceeded Message
3) IP Parameter Problem
4) ICMP Redirect

Answer 2

1) When ICMP indicates to the sender that the datagram could not be forwarded properly to the destination.
2) ICMP uses this message to notify the source that the TTL of the datagram has exceeded.
3) This occurs when there is some type of error in the IP header.
4) Informs the host that there is a more optimal routing path.

Question 3

Describe these Troubleshooting Network Issues:
1) Network cable is unplugged
2) Network path cannot be found.

Answer 3

1) Indicates that the computer is not detecting an Ethernet connection.
2) Network connection doesn’t exist, is blocked up firewall, do not allow sharin. Displayed as 0x80070035.

Question 4

Describe these Troubleshooting Tools:
1) Ping
2) Traceroute
3) ipconfig/ifconfig
4) nslookup
5) netstat

Answer 4

1) Used to test if an IP address is accessible by the host.
2) Traces the packets path when connecting to a server.
3) Displays all current TCP/IP network configurations; IP address, subnet mask, and default gateway for all adapters.
4) Use to find a specific IP address associated with a domain name.
5) Displays incoming.outgoin TCP/IP traffic.

Question 5

Describe these Troubleshooting Tools:
1) PuTTY
2) IP subnet calculator
3) speedtest.net
4) pathping
5) route

Answer 5

1) Is a FTP or SSH client for transferring files. Offers hashing.
2) Defines possible IP addresses along with class of IP.
3) Determines available bandwidth for a particular host.
4) Is a combination of traceroute and ping
5) Shows the ongoing status of the routing table of the host.

Question 6

Describe these Troubleshooting Tools:
1) nmap
2) Wireshark
3) hping2/3
4) netcat

Answer 6

1) Is a security scanner for network exploration.
2) Captures and browses traffic in a network.
3) Is a network scanning and packet crafting tool for the TCP/IP protocol.
4) Test network connections and monitors traffic flow.

Question 7

Describe these Troubleshooting Tools:
1) dig
2) arp
3) tcpdump
4) tcpreply
5) dnsenum

Answer 7

1) Used for DNS queries and retrieve information about target host addresses, name servers, and mail exchanges.
2) Troubleshoots the ARP cache table.
3) Captures and analyzes network traffic.
4) Modifies and replays previously sniffed traffic from tools such as Wireshark or tcpdump.
5) Enumerates DNS information of a domain.