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Table Of Contents  CertiGuide to Network+
 9  Appendix A: Answers to Success Questions and Real World Exam Questions

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Chapter 0100: Network Protocols Answers
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Chapter 0101: TCP/IP Answers

1. What is DHCP used for?

A. Share route information between routers

B. Display all statically assigned IP addresses in use

C. Resolve host names to IP addresses

D. Dynamically assign IP addresses as needed on a network

E. Get DNS, default route, and subnet mask information

Explanation: Dynamic Host Configuration Protocol (DHCP) is used to assign IP addresses to devices that attach to the network from a database or "pool" of unused IP addresses on an as-needed basis.

& Domain 2.7: Identify the purpose of the following network services (e.g. DHCP/bootp, DNS, NAT/ICS, WINS and SNMP)


 

2. What is the typical default lease life of a dynamically assigned IP address?

A. Permanent

B. For as long as the host is connected to the network

C. 72 hours

D. 36 hours

E. 24 hours

Explanation: The default lease life of an assigned IP address 72 hours.

& Domain 2.5: Define the purpose, function and/or use of the following protocols within TCP/IP: IP, TCP, UDP, FTP, TFTP, SMTP, HTTP, HTTPS, POP3/IMAP4, Telnet, ICMP, ARP, NTP.

& Domain 2.7: Identify the purpose of the following network services (e.g. DHCP/bootp, DNS, NAT/ICS, WINS and SNMP)


 

3. What name resolution protocol is most commonly used in large environments including the Internet?

A. Hosts

B. WINS

C. NetBIOS

D. DNS

E. ARP

Explanation: Domain Name Service (DNS) uses a hierarchical formula to resolve hundreds of computer names by breaking their addresses down into smaller and smaller pieces until a specific computer is located.

& Domain 2.7: Identify the purpose of the following network services (e.g. DHCP/bootp, DNS, NAT/ICS, WINS and SNMP).

& Domain 3.11: Given a network configuration select the appropriate NIC and network configuration settings (DHCP, DNS, WINS, protocols, NetBIOS/host name etc.).

& Domain 4.8: Given a scenario predict the impact of modifying, adding, or removing Network Services (e.g., DHCP, DNS, WINS, etc.) on network resources and users.


 

4. What is the order in which a server named rocky.bullwinkle@cartoon.com would be located in a typical DNS request?

A. Root --> Cartoon Servers --> Characters

B. Root --> COM Servers --> Characters --> rocky server

C. Root --> COM Servers --> cartoon Servers --> bullwinkle Servers --> rocky Server

D. rocky Server --> bullwinkle server --> cartoon server --> com servers

E. rocky.bullwinkle Server --> cartoon server --> com servers

Explanation: A query is made to a central server (the Root) to find where a COM Server is. Then, the COM Server which keeps track of names and addresses of commercial servers would point you in the direction of the "Cartoon" servers. The "Cartoon" servers would give addresses for the "Bullwinkle" servers, and finally "Bullwinkle" servers would point you to the server named "Rocky".

& Domain 2.7: Identify the purpose of the following network services (e.g. DHCP/bootp, DNS, NAT/ICS, WINS and SNMP).

& Domain 4.8: Given a scenario predict the impact of modifying, adding, or removing Network Services (e.g., DHCP, DNS, WINS, etc.) on network resources and users.


 

5. What are the commonly used port numbers known as?

A. Basic access ports

B. Well known ports

C. Host sockets

D. Communication links

E. TCP transports

Explanation: "Well known ports" are numerous port numbers reserved for specific protocols. The most commonly used port numbers are: Port 21 - FTP, Port 23 - Telnet, Port 25 - SMTP, and Port 80 - HTTP.

& Domain 2.6: Define the function of TCP/UDP ports. Identify well-known ports.


 

6. What is the function of the FTP protocol?

A. Send files between computers

B. Connects file servers on the World Wide Web

C. Holds file transmitted POP3 mail

D. Allows password free file transfers

E. Network management of devices

Explanation: FTP is the standard method of sending files between computers over a TCP/IP based network.

& Domain 2.5: Define the purpose, function and/or use of the following protocols within TCP/IP: IP, TCP, UDP, FTP, TFTP, SMTP, HTTP, HTTPS, POP3/IMAP4, Telnet, ICMP, ARP, NTP.


 

7. What is the basic message handling method of the POP3 protocol?

A. SMTP

B. Store and forward

C. Cut-through

D. Dial-up on demand

E. Ethernet

Explanation: All mail received at a POP3 server is held until a client requests the information, then all of the messages are forwarded to the client at once.

& Domain 2.5: Define the purpose, function and/or use of the following protocols within TCP/IP: IP, TCP, UDP, FTP, TFTP, SMTP, HTTP, HTTPS, POP3/IMAP4, Telnet, ICMP, ARP, NTP.


 

8. What text-based utility could you use to access a router or a UNIX server?

A. FTP

B. Ping

C. Ipconfig

D. Telnet

E. Tracert

Explanation: Telnet is a remote terminal emulation protocol that provides text-based access to a host running a telnet service.

& Domain 2.5: Define the purpose, function and/or use of the following protocols within TCP/IP: IP, TCP, UDP, FTP, TFTP, SMTP, HTTP, HTTPS, POP3/IMAP4, Telnet, ICMP, ARP, NTP.


 

9. When a packet's destination is unknown, what method is deployed to forward the packet to another network?

A. OSPF

B. RIP

C. Default Route (Gateway)

D. DNS Server

E. WINS Server

Explanation: The default router, or default gateway, is used to send all packets destined to an unknown address so that another router downstream can (hopefully) route the packet to its proper destination.

& Domain 2.9: Identify the purpose of subnetting and default gateways.


 

10. The primary use of DNS is to?

A. Resolve NetBIOS addresses

B. Resolve NetBEUI addresses

C. Resolve WINS addresses

D. Resolve a DNS name to a TCP/IP address

E. All choices are correct

Explanation: DNS is a database. While similar to a host file in that both convert (resolve) numeric IP address to a simpler and easier to remember name, DNS is not a flat text file like a host file is. NetBIOS is a Microsoft LAN protocol used to name individual computers on the LAN. The NetBEUI protocol was jointly developed by IBM and Microsoft to be a LAN based transport protocol, and typically is tightly bound to NetBIOS. WINS (Windows Internet Naming Service) is an NT/Windows 2000 (optional) server service to assist in name resolution of NetBIOS names.

& Domain 2.7: Identify the purpose of the following network services (e.g. DHCP/bootp, DNS, NAT/ICS, WINS and SNMP)


 

11. DNS is responsible for:

A. Resolving NetBIOS names

B. Resolving IP addresses

C. Updating OSPF routes

D. Backing up a WINS database

E. All choices are correct

Explanation: DNS (Domain Name Service) is a hierarchical (vertical) domain name-to-IP address resolution system which is used on the Internet. Before DNS, there was just one static HOSTS file, which mapped ALL domain names to IP addresses. This became cumbersome to manage as more and more domains came into existence, so a more dynamic system was conceived. WINS maps NetBIOS names to IP addresses. OSPF (Open Shortest Path First) is simply a routing protocol.

& Domain 2.7: Identify the purpose of the following network services (e.g. DHCP/bootp, DNS, NAT/ICS, WINS and SNMP)


 

12. The IP number 127.0.0.1 is usually assigned to which of the following?

A. Hub

B. Switch

C. All hosts as a local address

D. A computer running NetBEUI so it may convert the protocol to IP

E. All choices apply

Explanation: If you find and open your LMHOSTS file you will see an entry for 127.0.0.1. This is used for testing TCP/IP on your system. If you are able to PING this address, this indicates that TCP/IP is installed correctly.

& Domain 2.5: Define the purpose, function and/or use of the following protocols within TCP/IP: IP, TCP, UDP, FTP, TFTP, SMTP, HTTP, HTTPS, POP3/IMAP4, Telnet, ICMP, ARP, NTP.

& Domain 2.8: Identify the IP addresses (IPv4, IPV6) and their default subnet masks.


 

13. A UNIX server on the Internet is configured to host a website and an FTP site. How will the server know which service the incoming packets are intended for?

A. Protocol ID

B. Port number

C. Host Header

D. TCP address

E. ARP announce

Explanation: Know your port assignments. HTTP (the protocol used for websites) is port 80, and the port number for FTP is 21.

& Domain 2.6: Define the function of TCP/UDP ports. Identify well-known ports.


 

14. You can access your Web server by its IP address, but not by its host name. What could be the problem?

A. The WINS server is not configured correctly or is not present

B. The LMHOSTS file is not configured correctly or is not present

C. The DNS server is not configured correctly or is not present

D. Windows Explorer is not configured correctly

E. Microsoft Internet Explorer is not configured correctly

Explanation: The resolution of host names is handled by either a DNS (Domain Name Service) server or a HOSTS file. If there are NetBIOS names involved, resolution is done by either an LMOSTS file or a WINS (Windows Internet Name Service) server. We are talking about a "Web" server, which indicates it is used for the Internet, so think DNS when you see those terms.

& Domain 2.7: Identify the purpose of the following network services (e.g. DHCP/bootp, DNS, NAT/ICS, WINS and SNMP)


 

15. What does the IP protocol use for host name resolution?

A. SAP

B. WINS

C. LMHOSTS

D. NDS

E. DNS

Explanation: The basic purpose of DNS (Domain Name Service) is to map domain names to IP addresses, and vice versa. WINS provides the same function for resolving NetBIOS names to IP addresses.

& Domain 2.7: Identify the purpose of the following network services (e.g. DHCP/bootp, DNS, NAT/ICS, WINS and SNMP)


 

16. Draw a line from each Protocol to the Port that it defaults to:

Protocol Default Port

TELNET Port 21

POP3 Port 23

HTTP Port 25

SMTP Port 80

FTP Port 110

 

Protocol --- --- --- --- Default Port

TELNET --- --- --- --- Port 23

POP3 --- --- --- --- Port 110

HTTP --- --- --- --- Port 80

SMTP --- --- --- --- Port 25

FTP --- --- --- --- Port 21

& Domain 2.6: Define the function of TCP/UDP ports. Identify well-known ports.


 

17. Your company is having trouble sending e-mail. You suspect the SMTP server is the culprit. To confirm your suspicions you decide to:

A. Ping the router

B. Use Telnet set to port 25

C. Run a diagnostic on the cable

D. Reboot the workstations

E. Run SNMP on the mail server

Explanation: Simple Network Management Protocol [SNMP] is used to run diagnostics over a network and can be used to analyze different ports, i.e. port 25 - the Simple Mail Transport Protocol. Rebooting the workstation would have no effect on the mail or SMTP server.

& Domain 2.6: Define the function of TCP/UDP ports. Identify well-known ports.


 

18. What are common items that must be configured correctly when installing a Network Interface Card (NIC)?

A. PCI or ISA slot

B. IRQ setting

C. DMA Address

D. Driver

E. I/O Address

Explanation: The IRQ, DMA, and I/O Address resources of the NIC must be configured as to not conflict with existing devices. The driver is responsible for controlling the NIC, and must be properly installed and configured.

& Domain 3.0: Network implementation

& Domain 3.11: Given a network configuration, select the appropriate next and network configuration settings.


 

19. What is the file called that resides on a host and contains host names and their IP addresses?

A. Lookup file

B. Address file

C. Host file

D. ARP file

E. Names file

Explanation: A Host File is a simple text file located on a host that contains IP addresses and corresponding computer names.

& Domain 3.11: Given a network configuration select the appropriate NIC and network configuration settings (DHCP, DNS, WINS, protocols, NetBIOS/host name etc.).


 

20. How many users can share the same user name on a network?

A. Depends on the number of licensed connections are owned

B. As many as you need, as long as only one person is logged in.

C. Only one, each person must have a unique network name

D. Two, as long as each one has a unique password

Explanation: Each PC on a network that uses NetBIOS (which includes most Windows based networks) require that each one be given a unique name.

& Domain 3.11: Given a network configuration, select the appropriate NIC and network configuration settings (DHCP, DNS, WINS, protocols, NetBIOS/host name etc.).


 

21. What file can be edited to resolve the domain www.myserver.com <http://www.myserver.com> on a UNIX machine?

A. LMHOSTS

B. HOSTS

C. WINS

D. DNS

E. Routing Table

Explanation: HOSTS files are used by DNS to resolve domain names, just as LMHOSTS files are used by WINS to resolve NetBIOS names. A routing table is used by routers to direct data packets to their proper destination, and thus is incorrect.

& Domain 3.11: Given a network configuration, select the appropriate NIC and network configuration settings (DHCP, DNS, WINS, protocols, NetBIOS/host name etc.).

& Domain 4.1: Given a troubleshooting scenario, select the appropriate TCP/IP utility from among the following: Tracert, ping, ARP, NBTstat, Netstat. IPconfig/Ifconfig, WinIPcfg, Nslookup.


 

22. What name resolution system can be used across different common network platforms?

A. DHCP

B. NetBIOS

C. DNS

D. WINS

E. ARP

Explanation: DNS is the de-facto domain name resolving service. DNS is a distributed Internet directory service and is used to translate domain names and IP addresses to and from one another. Most Internet services rely on DNS to work. If DNS fails, web sites cannot be located and email delivery stalls.

HOSTS files used to do the mappings, but they became cumbersome to constantly update when the Internet grew.

WINS maps NetBIOS names to IP addresses. ARP is what is used to map IP addresses to physical addresses. DHCP supplies IP addresses to clients from a pool of IP addresses.

& Domain 3.11: Given a network configuration, select the appropriate NIC and network configuration settings (DHCP, DNS, WINS, protocols, NetBIOS/host name etc.).


 

23. To configure a NIC for use with a Linux OS you would type the ________ command.

A. IFCONFIG

B. IPCONFIG

C. NICCFG

D. LINUXCFG

E. NETCFG

Explanation: Most versions of LINUX use the IFCONFIG command, and it may include arguments.

& Domain 3.11: Given a network configuration, select the appropriate NIC and network configuration settings (DHCP, DNS, WINS, protocols, NetBIOS/host name etc.).


 

24. By default, ARP entries are retained in memory for:

A. 2 minutes unless they have been reused, then they'll be retained up to 10 minutes

B. 36 hours unless they are renewed half way before being purged

C. For as long as the PC remains connected to the network

D. 5 minutes unless a manual request is made to keep the tables longer

E. 10 minutes or more if cache memory is not full.

Explanation: An ARP entry if not reused after 2 minutes will be purged from cache, otherwise entries will be deleted after 10 minutes.

& Domain 4.1: Given a troubleshooting scenario select the appropriate TCP/IP utility from among the following: Tracert, ping, ARP, NBTstat, Netstat. IPconfig/Ifconfig, WinIPcfg, Nslookup.


 

25. What information does TRACERT provide that ping does not?

A. How much time it takes to reach a host

B. DNS server addresses

C. The IP address of the route device

D. How many hops away a target device is

E. Physical MAC address of target host

Explanation: The Tracert utility goes a bit farther than Ping in that it tells how many hops away the target device is.

& Domain 4.1: Given a troubleshooting scenario, select the appropriate TCP/IP utility from among the following: Tracert, ping, ARP, NBTstat, Netstat. IPconfig/Ifconfig, WinIPcfg, Nslookup.


 

26. You are troubleshooting a Windows-based PC and wish to continuously send ICMP packets for review. To accomplish this, you would type:

A. NETSTAT -C

B. NBTSTAT /S

C. ARP -T

D. IPCONFIG /T

E. PING -t

Explanation: Netstat is for network statistics, NBTSTAT is for NetBIOS information, ARP reveals the binding between a MAC address and an IP number, and IPCONFIG is used in NT to display IP numbers and gateway. Ping uses ICMP in an attempt to get an echo reply, and the -T argument in windows continuously sends ICMP packets until the process is terminated.

& Domain 4.1: Given a troubleshooting scenario, select the appropriate TCP/IP utility from among the following: Tracert, ping, ARP, NBTstat, Netstat. IPconfig/Ifconfig, WinIPcfg, Nslookup.


 

27. ________is a utility that sends an ICMP request (by default) 4 times.

A. PING

B. TRACERT

C. NBTSTAT

D. ARP

Explanation: The PING utility uses the ICMP (Internet Control Message Protocol) to test internet connections. It accomplishes this by sending tiny pieces of data (32 bytes, to be exact) to an IP. If responses are received, the connection has been validated you can also ping a domain name to confirm a connection.

& Domain 4.1: Given a troubleshooting scenario, select the appropriate TCP/IP utility from among the following: Tracert, ping, ARP, NBTstat, Netstat. IPconfig/Ifconfig, WinIPcfg, Nslookup.


 

28. What three things do you need to specify on a workstation for DNS resolution?

A. Domain name

B. Host name

C. NetBIOS name

D. WINS address

E. IP address of the DNS server

Explanation: There are two different domain types in the realm of networks: Internet domains and network domains. The World Wide Web is one big network and within it are Internet domains, like www.whitehouse.gov. Microsoft LANs contain domains that consist of a server and a group of client PCs. The prior uses DNS for address resolution and the latter uses WINS. These are very easy to confuse, but if you know the difference between the two, you're ahead of the game.

NetBIOS names are actually the friendly names of your PCs, and are resolved by either the WINS service or with LMHOSTS files.

& Domain 4.8: Given a scenario, predict the impact of modifying, adding, or removing Network Services (e.g., DHCP, DNS, WINS, etc.) on network resources and users.


 

29. Draw a line from each Class Type to its associated IP address type (not all IP addresses will be used):

Class Types IP Addresses

Class A 199.116.141.240

Class B 127.0.0.1

Class C 123.66.50.19

225.0.0.3

162.135.146.0

 

Protocol --- --- --- --- Default Port

Class Types IP Addresses

Class A --- --- --- --- 123.66.50.19

Class B --- --- --- --- 162.135.146.0

Class C --- --- --- --- 199.116.141.240

 

 

Explanation: This one is easier than it might seem. The address class ranges break down as follows:

Class First Number of IP addresses

Class A Range = 1-126

Class B Range = 128-191

Class C Range = 198-223

Class D Range = 224-239

Loop Back Test = 127

& Domain 2.8: Identify the IP addresses (IPv4, IPV6) and their default subnet masks.


 

30. Your 100 PC network is bogged down. Everything is connected correctly and there are no conflicts that you are aware of. What can you use to troubleshoot the problem?

A. NETSTAT

B. NBTSTAT

C. Loopback address

D. Network Monitor

E. Performance Monitor

Explanation: Network Monitoring (a.k.a. NetMon) software enables administrators to filter and capture data packets for analysis. This can be very useful for isolating where the bottlenecks on your networks are.

& Domain 4.1: Given a troubleshooting scenario, select the appropriate TCP/IP utility from among the following: Tracert, ping, ARP, Nbtstat, Netstat. IPconfig/Ifconfig, WinIPcfg, Nslookup.


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