Ch15 Network Troubleshooting Exam

Ch15 Network Troubleshooting Exam

1. If you are trying to login to a server and are unable to connect, which command would you use to verify network connectivity?

   • traceroute 
   • dig 
   • ifconfig 
   • ping

2. One of the NICs on the server corresponding to eth1 has a hardware issue and needs to be removed. It is not necessary to restart the network service for this.

   True or False?

   • True 
   • False

3. Which command is used to restart the network service on Red Hat systems?

   • /etc/init.d/rc.d/network restart 
   • /etc/init.d/network resume 
   • /etc/network/interfaces restart 
   • /etc/init.d/network restart

4. The network interface disabled using the ifdown command will remain disabled after the system restarts.

   True or False?

   • True 
   • False

5. Which command’s output will include the ICMP sequence number field?

   • ifconfig
   • traceroute 
   • ping 
   • route

6. You notice that the round trip time to a particular host is slowly increasing. Which command’s output has given you this information? 

   • route 
   • ping 
   • ping -Q 
   • netstat

7. Which of the following is not a function of the netstat command?

   • View the route used by packets to reach a given destination 
   • View port information
   •  View the kernel’s routing tables 
   • View interface statistics

8. The kernel’s routing table can be viewed using the commands ______.

   • netstat and route 
   • route and ifconfig 
   • netstat and ifconfig 
   • netstat and traceroute

9. Which command can be used to find the ports that are listening for connections on a host?

   • netstat -a
   • netstat -s
   • netstat -l
   • netstat -z

10. You log in to a server using telnet and bring down the eth0 interface (the only configured interface) using the ifdown command. What is the result of executing ifdown?

    • The eth0 interface will be disabled and the telnet session will continue 
    • An error will be displayed that the eth0 interface cannot be disabled 
    • The eth0 interface will be disabled with a warning 
    • The eth0 interface will be disabled and the telnet session will be terminated

11. Which command is used to keep track of suspicious connections?

    • ifconfig 
    • netstat 
    • ping 
    • traceroute

12. The _____ indicates the maximum number of IP routers that can route a packet.

    • Time to Live 
    • Time to Route 
    • Router Hops 
    • Time to Reach

13. The traceroute command can be used by regular and root users.

    True or False? 

    • True 
    • False

14. What of the following is not true about the tracepath command?

    • Discovers maximum transmission unit (MTU) along the path 
    • Sends ICMP messages 
    • Can be used only by root user 
    • Traces the path to a network host

15. The netstat command is used to add a route to the kernel’s routing table.

    True or False?

    • True 
    • False

16. The ifup command can read interface definitions from a file other than the default file.

    True or False?

    • True 
    • False

17. Which of the information listed below is not shown by the ping command?

    • TTL 
    • Route to the destination 
    • Round-trip Time 
    • Packet Loss

18. You want to switch the NIC cards of two servers currently in use. Which command will be used to disable the interfaces for this activity?

    • route down
    • nicdown 
    • ifdown 
    • ip down

19. The ifdown command can be used to disable all configured network interfaces.

    True or False?

    • True
    • False

20. When using the ss command which column shows the socket type?

    • Netid 
    • Local Address 
    • Send-Q 
    • Type Socket

21. The netcat utility is only available on Debian Linux distributions

    True or False?

    • True 
    • False

22. The ping6 command differs from the ping command how? 

    • It can only use hostnames 
    • It is only available on Red Hat Linux Distributions 
    • It uses the ICMPv6 Echo_Request protocol 
    • It requires a fully qualified domain name and the IPv6 address to work

23. The traceroute6 command is analogous to the __________ command. 

    • traceroute -w 
    • traceroute -6 
    • ping6 
    • traceroute -i

24. The tracepath6 command uses the sockets API to map paths to IPv6 network hosts.

    True or False?

    • True 
    • False

25. Finding machines on the same network segment as your interface can be done with which command? 

    • ip neighbor show 
    • link show 
    • neighbor -i 
    • ip address --segment

26. The ip link command is useful for troubleshooting OSI Layer 2 problems.

    True or False?

    • True 
    • False

27. The ip command is different from the ifconfig command for the following reason:

    • It can perform the work of several different legacy commands 
    • It can only show virtual interfaces 
    • It doesn’t show hardware addresses by default 
    • It appears less verbose at first glance

28. Using the -s option with the ip command will display:

    • Network interfaces that are currently slow 
    • Static interfaces only 
    • Statistics for the object referenced 
    • Supersedes all other commands used

29. The ip command is useful for both configuration and control of network interfaces.

    True or False?

    • True 
    • False

30. Which legacy command cannot be replaced with the ip command?

    • arp 
    • ifconfig 
    • ping
    • route