CompTia A+ : Chapter 6

Question 1

You have just set up a network that will use the TCP/IP protocol, and you want client computers to obtain IP configuration information automatically. Which type of server do you need for this?

Answer 1

DCHP (Dynamic Host Configuration Protocol) [ DCHP provides IP configuration information to hosts when they join the network. A Domain name system (DNS) server resolves hostnames to IP addresses. Network address translation (NAT) translates private IP addresses. There is no IP configuration server (other than the DCHP server)]

Question 2

Which of the following protocols were designed to access information stored in an information directory, such as employee phone books?

Answer 2

Lightweight directory access protocol (LDAP) [ is designed to access information stored in a database or directory typically referred to as a LDAP directory or LDAP database. This typically includes employee data and network configuration data. FTP is designed to transfer files. RDP is remote desktop protocol, and CIFS is used to share files and printers.

Question 3

Which TCP/IP protocol uses port 80?

Answer 3

HTTP uses port 80. HTTPS uses port 443, Telnet uses port 23, and POP3 uses port 110.

Question 4

What is the maximum number of IPv6 addresses that can be assigned to one IPv6 interface?

Answer 4

It is not limited but may be limited by practicality.

Question 5

Which of the following are valid examples of IPv6 addresses? (Choose all that apply)

Answer 5

A,B, and C. [An IPv6 address contains 128 bits, written in 8 16 -bit fields represented by 4 hexadecimal digits. Option A contains all 8 fields expressed in full. Option B is a IPv4 address expressed in IPv6 form. Option C is the same address as option A, but written in accepted short hand. Option D is not valid because the double colons can be used only once within an address.]

Question 6

Which of the following IP addresses would not be valid for a DNS server on the Internet?

Answer 6

10.24.11.33 is in a private address space and would therefore not be valid on the internet.

Question 7

The workstations on your network are configured to use a DHCP server. One of the workstations can’t communicate with other computers. Its IP address is 169.254.1.18. What could be the problem?

Answer 7

The address assigned to the computer is a APIPA address. Microsoft client computers (and others) will configure themselves with an address in this range if they are unable to reach a DHCP server.

Question 8

Which of the following protocols is responsible for sending an email?

Answer 8

Simple Mail Transfer Protocol (SMTP) is responsible for sending an email [ IMAP4 and POP3 both will receive an email. SNMP is a network management protocol.]

Question 9

What port does the RDP protocol work on?

Answer 9

3389 [ DNS works on port 53, IMAP4 works on port 143, and LDAP works on port 389.]

Question 10

An email administrator wants to help protect against their server being spoofed to send spam. They were told that they can do this with a TXT record in their DNS server. If they want to authenticate emails using an encrypted security key, which TXT record would be most appropriate?

Answer 10

DKIM [DKIM authenticates messages from email servers using private-public encrypted key pairs. SPF authenticates via IP addresses . DMARC is a TXT record that allows administrators to specify how they want rejected emails to be handled. VLAN is a virtual LAN and is not a TXT record type.]

Question 11

What are the advantages that TCP has over UDP? (Choose two)

Answer 11

Virtual circuits and acknowledged delivery. [ Because of its features it has higher overhead than UDP and is a little slower.]

Question 12

Your friend is concerned about the security of making an online purchase. What should you tell them to look for in the address bar of the web browser?

Answer 12

HTTPS [TLS and SSH are also secure, but they are not protocols used to connect to websites.]

Question 13

You are manually configuring a TCP/IP host. Another administrator gives you the router’s IP address. What is the TCP/IP term for this?`

Answer 13

The default gateway [ Without this configuration option, you would not be able to get to external networks. The subnet mask tells the host which network its on. The DNS server resolves the hostname to the IP addresses, and a DHCP server provides IP configuration information to the hosts.]

Question 14

Your network is running IPv4. Which of the configuration options are mandatory for your host to communicate on the network?

Answer 14

The only mandatory IPv4 configuration options are the subnet mask and an IP address. [If you are not connecting to another network, you don’t need a default gateway. DNS servers resolve hostnames to IP addresses, they are not mandatory.]

Question 15

Which of the following protocols is used for secure retrieval of email?

Answer 15

IMAP4 [ IMAP4 and POP3 are both used to retrieve email, but only IMAP4 provides security features. SMTP sends email and SNMP is a network management protocol.]

Question 16

Which of the following is the name of a secure point-to-point connection made over a pubic network?

Answer 16

VPN or Virtual Private Network [ NAT translates public IP addresses to private IP addresses. APIPA is an automatic IP address assignment if a client computer can’t automatically reach a DHCP server. VLANS are Virtual Local Area Networks configured through switches.]

Question 17

Which network protocol is used for administration of networking devices such as routers and switches, and which ports does it use?

Answer 17

SNMP or Simple Network Management Protocol [ It uses ports 161 and 162. SMTP is for sending mail and uses port 25.]

Question 18

Which of the following is an IPv6 broadcast address?

Answer 18

IPv6 does not have broadcasts [ IPv6 does have multicasts, which are a bit like targeted broadcasts. FF00: is the first part of a multicast address.]

Question 19

You are setting up a small network that will not connect to the Internet. You want computers to be able to locate each other by using hostnames. What service will do this?

Answer 19

DNS or Domain Name Server.

Question 20

Which of the following protocols is responsible for resolving IP addresses to hardware addresses?

Answer 20

ARP or Address Resolution Protocol. [RARP does the reverse and resolves MAC addresses to IP addresses.]

Question 21

Performance based question Match the following protocols (services) below to their respective ports in the table.