TCP/IP Utilities and Troubleshooting Flashcards
Which utility can be used to display and modify the table that maintains the TCP/IP address–to–MAC address translation?
NBTSTAT
Telnet
ARP
ARP
ARP is responsible for converting a layer-3 address (IP address) to a layer-2 address (MAC address). A utility by the same name is available in most operating systems and is responsible for modifying entries within the ARP cache
Which are not valid message types for ARP? (Choose all that apply.)
ARP reply
ARP decline
ARP response
ARP request
ARP decline
ARP response
ARP decline and ARP response are not valid ARP messages. Only four types of messages can be sent out by the ARP protocol: ARP request, ARP reply, RARP request, and RARP reply
How long will a dynamic ARP entry remain in cache if it has not been reused?
10 minutes
5 minutes
2 minutes
2 minutes
Two minutes. Unlike static addresses, which never age out, dynamic addresses remain for only a predetermined amount of time. Windows adjusts the size of the ARP cache automatically. Entries not used after two minutes are removed. If entries are used frequently, they remain in the ARP cache for ten minutes
ARP is responsible for converting ________________ addresses to ________________ addresses.
layer-3, layer-2
layer-4, layer-3
layer-2, layer-3
layer-3, layer-2
ARP is responsible for converting IP addresses (layer-3 addresses) to MAC addresses (layer-2 addresses)
Which command and command switch were used to generate the following output?
Interface: 10.10.10.101
Internet Address Physical Address Type
12.10.10.10 00-06-6b-8e-4e-e3 dynamic
12.10.10.19 00-c0-ae-d0-bb-f5 dynamic
ARP -d
IPCONFIG /DISPLAYMAC
ARP -a
ARP -a
ARP -a will display the ARP cache, which is what the output for this question is showing. Be sure you can identify the output for the exam
Which utility enables you to execute console commands remotely through a terminal session?
FTP
Ping
Telnet
Telnet
Telnet (telecommunications network) was designed to provide a virtual terminal or remote login across the network. This enables the user to execute commands on a remote machine anywhere on the network as if he or she were sitting in front of the console. The term Telnet refers to both the protocol and the application used for remote management
Which protocol is defined to use TCP port 23?
Telnet
FTP
HTTP
Telnet
Telnet uses TCP port 23 by default
Which utility is used to determine the path that data takes to a remote host?
NBTSTAT
FTP
Tracert
Tracert
Tracert is a command-line utility that was designed to determine the path taken by a data packet to reach its destination. This can be very helpful in determining at what point a network connection is no longer active. It can also be helpful in troubleshooting issues with network response times
Which command was used to generate the following command output?
1 <10 ms <10 ms <10 ms 192.168.0.254
2 <10 ms <10 ms <10 ms 12.127.106.34
3 40 ms 40 ms 50 ms r04.nycmny01.us.bb.verio.net [129.250.10.37]
4 40 ms 40 ms 40 ms r20.nycmny01.us.bb.verio.net [129.250.2.36]
5 40 ms 40 ms 50 ms r00.nwrknj01.us.bb.verio.net [129.250.2.216]
6 110 ms 121 ms 120 ms 192.94.118.221
7 110 ms 130 ms 120 ms www.novell.com [130.57.4.27]
Trace complete.
TRACERT www.novell.com
Ping www.novell.com
NSLOOKUP www.novell.com
TRACERT www.novell.com
Tracert sends back multiple responses, one for each router that it hits on its way to the destination address. In this example, we are tracing the pathway to www.novell.com and getting a hop entry with each router on the way
Which utility is used to display TCP/IP-specific protocol and interface statistics?
NBTSTAT
ARP
Netstat
Netstat
Netstat displays protocol statistics and current TCP/IP network connections. This utility can be used to display in-depth detail about protocol status, statistics for the different network interfaces, and the current routing table
Which command and command switch were used to generate the following output?
Active Connections
Proto Local Address Foreign Address Stat
TCP comp1:smtp 2kpc1.domain5.net:0 LISTENING
TCP comp1:http xppc2.domain5.net:1256 LISTENING
TCP comp1:epmap 2kpc1.domain5.net:0 LISTENING
TCP comp1:https 2kpc1.domain5.net:0 LISTENING
TCP comp1:microsoft-ds 2kpc1.domain5.net:0 LISTENING
TCP comp1:1025 2kpc1.domain5.net:0 LISTENING
TCP comp1:1245 2kpc1.domain5.net:0 LISTENING
TCP comp1:1277 2kpc1.domain5.net:0 LISTENING
TCP comp1:1312 2kpc1.domain5.net:0 LISTENING
NBTSTAT -c
NETSTAT -a
IPCONFIG /ALL
NETSTAT -a
The Netstat utility is used to view TCP/IP connection information and listening ports
Which items are not available for display in IPCONFIG?
TCP/IP address
MAC address
DHCP lease information
None of the above
None of the above
All of the options listed can be displayed in IPCONFIG by using the /ALL option
Which option of IPCONFIG is used to receive a new lease on your IP address?
/release
/obtain
/renew
/renew
The /renew switch is used to renew the IP address that you have obtained from the DHCP server
You are troubleshooting to determine why Sue’s computer cannot connect to the Internet. What command would you type to view all of Sue’s TCP/IP settings in a Windows command prompt?
IPCONFIG
IPCONFIG /ALL
IPCONFIG /SHOWITALL
IPCONFIG /ALL
IPCONFIG /ALL is used to view all of the TCP/IP settings on a system
Which utility is used to facilitate file transfers between two remote hosts?
FTP
Telnet
Ping
FTP
FTP (File Transfer Protocol) is designed primarily for transferring data across a network. FTP denotes both a protocol and a utility used for this purpose
What TCP ports are used by FTP services? (Choose two.)
TCP port 20
TCP port 25
TCP port 21
TCP port 80
TCP port 20
TCP port 21
FTP uses two TCP channels to operate. It uses TCP port 20 as the data transfer channel and TCP port 21 for control commands. The data transfer channel is known as the DTP, or Data Transfer Process, and the command channel is known as the PI, or Protocol Interpreter. The two channels enable you to transfer data and execute commands at the same time, and they provide a more efficient and faster data transfer. FTP also works in real time. It does not queue up requests as most other utilities do; it transfers data while you watch
Which utility is used to verify network connectivity of a remote host?
Route
ARP
Ping
Ping
The ping (Packet Internet Groper) command is the most-used TCP/IP troubleshooting tool available. This command is used to test a machine’s connectivity to the network and to verify that it is active. Usually, using this command is one of the first steps to any troubleshooting if a connectivity problem is occurring between two computers. This can quickly help you to determine whether a remote host is available and responsive
You are having trouble connecting to resources on the Internet, so you use the IPCONFIG utility to verify your TCP/IP configuration. The configuration is shown.
Ethernet adapter Lan Connection:
Connection-specific DNS Suffix . : glensworld.loc
IP Address. . . . . . . . . . . . : 192.168.1.100
Subnet Mask . . . . . . . . . . . : 255.255.255.0
c
Your configuration seems to be accurate. Which command would you type next to help determine what the problem is?
Ping glensworld.loc
Ping 192.168.1.100
Ping 192.168.1.1
Ping 192.168.1.1
When troubleshooting connectivity to the Internet, you first check your TCP/IP settings and then ping the IP address of the default gateway to verify that the router is up and running
The following output was generated from which command?
Reply from 10.10.10.1: bytes>32 time<1ms TTL>128
Reply from 10.10.10.1: bytes>32 time<1ms TTL>128
Reply from 10.10.10.1: bytes>32 time<1ms TTL>128
Reply from 10.10.10.1: bytes>32 time<1ms TTL>128
Ping statistics for 10.10.10.1:
Packets: Sent > 4, Received > 4, Lost > 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum > 0ms, Maximum > 0ms, Average > 0ms
ROUTE 10.10.10.1
Ping 127.0.0.1
Ping 10.10.10.1
Ping 10.10.10.1
In the output you can see that the address of 10.10.10.1 is sending responses back. There are four responses that are the four ping response messages
You are having trouble resolving the entry server.certworld.loc to an IP address and suspect that the DNS resolver cache is causing the problem. Which of the following commands would you use to delete all entries from the cache?
ipconfig /purgeall
ipconfig /displaydns
ipconfig /flushdns
ipconfig /flushdns
ipconfig /flushdns is used to flush the DNS resolver cache of a Windows system
Which utility is used to verify the DNS database on a DNS server?
ARP
Ping
NSLOOKUP
NSLOOKUP
The NSLOOKUP utility is used to view and test the DNS database on the DNS server
What dig command is used to perform a reverse name query?
Dig www.gleneclarke.com
Dig www.gleneclarke.com +short
Dig -x 192.168.2.200
Dig -x 192.168.2.200
To perform a reverse query with dig, you use the -x switch and then supply the IP address of the system you wish to know the name of
Which TCP/IP utility is used to manage the routing table on the local system?
Route
ARP
Ping
Route
The route utility is used to manage the local routing table. You can view the routing table with route print and add a route with route add
You wish to find out what your system name is. What utility would you use?
Route
hostname
Ping
hostname
The hostname command is used to display the system name
What command would you use to verify that TCP/IP is running successfully on your system?
arp
ping 127.0.0.1
telnet
ping 127.0.0.1
You would ping the loopback address to verify that the TCP/IP software stack is installed and working
What service is used to convert an FQDN to an IP address?
Telnet
FTP
DNS
DNS
DNS is used to convert the FQDN—for example, www.gleneclarke.com—to an IP address
