Question 1

In a DNS zone, what type of record holds the name-to-address mapping for IPv6 addresses?
A) A record
B) AAAA record
C) PTR record
D) TXT record

Accepted Answer

An AAAA record (also known as a quad-A record) is used to map an IPv6 address to a domain name in a DNS zone. It is similar to an A record used for mapping IPv4 addresses. A records hold the name-to-address mapping for IPv4 addresses, PTR records are used for reverse DNS lookups, and TXT records hold various types of text-based information like SPF records for email authentication.

Question 2

You are setting up a DNS zone and have been asked to create SPF and DKIM records. What type of DNS record will hold this information?
A) SRV record
B) CNAME record
C) TXT record
D) PTR record

Accepted Answer

SPF and DKIM records are both stored in TXT DNS records. SRV records are used to define service location, CNAME records create an alias for other DNS records, and PTR records are used for reverse DNS lookups.

Question 3

What command can be used to check a domain computer's time source from a Command Prompt window?
A) date /source
B) w32tm /query /source
C) ntpd show source
D) time --source

Accepted Answer

The "w32tm /query /source" command can be used to check a domain computer's time source from a Command Prompt window. This command will display the source from where the computer is getting its time synchronization information.

Question 4

You are troubleshooting a network issue on a client computer and discover that the network card has an IP address of 169.254.196.200. What does this mean?
A) The computer has been assigned a routed public IP address.
B) The network card has been erroneously assigned a loopback address.
C) The computer is configured to use DHCP, but was unable to lease an address.
D) The network card is set up for multicast communication.

Accepted Answer

The IP address 169.254.196.200 is an Automatic Private IP Address (APIPA). This means that the computer was configured to use DHCP to obtain an IP address from a DHCP server, but was not able to connect to one or receive a response. As a fallback, the network card assigns itself a self-generated IP address in the reserved range of 169.254.x.x. This indicates that there are some issues with DHCP.

Question 5

What does the MX record do in a forward DNS zone?
A) It identifies the hostname and port of a computer that hosts a specific network service, such as FTP or SIP.
B) It identifies the authoritative name server for a domain.
C) It identifies the e-mail server to be used for e-mail traffic for the domain.
D) It holds the alternative names for a host.

Accepted Answer

The MX record in a forward DNS zone identifies the e-mail server to be used for e-mail traffic for the domain.

Question 6

Which of the following is NOT a range of IP addresses recommended for use in private networks?
A) 10.0.0.0 through 10.255.255.255
B) 172.16.0.0 through 172.31.255.255
C) 192.168.0.0 through 192.168.255.255
D) 127.0.0.0 through 127.255.255.255

Accepted Answer

The range of IP addresses 127.0.0.0 through 127.255.255.255 is not recommended for use in private networks because it is reserved for loopback purposes, which allows a device to send messages to itself. Therefore, the best choices for private network IP ranges are A, B, and C.

Question 7

How do routers create a broadcast domain boundary?
A) They forward broadcasts only to necessary segments.
B) They listen to and direct broadcast traffic.
C) They only forward broadcasts that are intended for multiple subnets.
D) They do not forward broadcast traffic.

Accepted Answer

Routers do not forward broadcast traffic by default. They create a boundary between different broadcast domains, which can improve network performance and security by limiting the scope of broadcast messages. Instead of sending broadcasts to all devices on a network, routers route traffic based on destination IP addresses and specific routing tables. This allows for more efficient network communication and reduces the risk of broadcast storms or other network issues.

Question 8

What is the ARPA domain suffix utilized for?
A) It is a specialized government restricted TLD.
B) It is used to announce records for other TLDs such as .com and .net.
C) It is a private TLD used for synchronization of zones between servers.
D) It is used for reverse DNS queries, and holds PTR records.

Accepted Answer

The ARPA domain suffix is used for reverse DNS queries, and holds PTR (Pointer) records. It is used to map IP addresses to domain names.

Question 9

What statement regarding the Server Message Block protocol is accurate?
A) It is a simple protocol used to synchronize block messages written to iSCSI drives on a network.
B) It is used by Windows and UNIX-based operating systems to share files.
C) It is a signaling protocol used to make a connection between hosts prior to data transfer.
D) It is a protocol used for accessing network-based LDAP directories.

Accepted Answer

The Server Message Block (SMB) protocol is primarily used by Windows and UNIX-based operating systems to share files, printer access, and other communication between networked computers.

Note: A is incorrect because iSCSI uses the SCSI (Small Computer System Interface) protocol to access remote storage devices over a network. C is incorrect because it refers to another protocol called Signaling System 7 (SS7), which is used in telecommunications. D is incorrect because LDAP (Lightweight Directory Access Protocol) is used for accessing directories such as those used in authentication systems or address books, but not for SMB-based file sharing.

Question 10

If a host's IPv6 address contains the network adapter's MAC address within the last 64 bits of the IPv6 address, what standard is being used?
A) EUI-64
B) IEEE 802.36
C) UUID-128
D) MACin6

Accepted Answer

The standard being used when a host's IPv6 address contains the network adapter's MAC address within the last 64 bits of the IPv6 address is EUI-64 (Extended Unique Identifier-64). This standard creates a 64-bit interface identifier by inserting the hexadecimal number FFFE between the manufacturer-assigned portion and the EUI-48 MAC address, and then invert bit 7 (Universal/Local bit) of the EUI-48 MAC address. This results in a unique 64-bit identifier that can be used in the creation of an IPv6 address.

Question 11

Your supervisor has asked you to configure a new prototype network with a dual stack configuration. What does this mean?
A) Two different IPv4 address spaces will exist on the same network segment.
B) Both IPv4 and IPv6 protocols will be used on the network.
C) The router serving the network will have a redundant spare.
D) The network will exist on two separate segments, separated by a proxy.

Accepted Answer

Dual stack configuration means that both IPv4 and IPv6 protocols will be used on the network. This allows for a smooth transition from IPv4 to IPv6 as more devices start to use IPv6.

Question 12

You are troubleshooting a DNS issue on a Linux system, and need to test the resolution of your domain mycompany.com MX record using Google's DNS server with the IP address of 8.8.8.8. What dig command will accomplish this?
A) dig --server 8.8.8.8 --type=mx mycompany.com
B) dig -s 8.8.8.8 -t mx mycompany.com
C) dig query 8.8.8.8 domain mycompany.com type mx
D) dig @8.8.8.8 mycompany.com MX

Accepted Answer

The correct dig command to test the resolution of a domain's MX record using a specific DNS server is "dig @ MX". In this case, the DNS server is 8.8.8.8 and the domain name is mycompany.com, therefore the correct command would be "dig @8.8.8.8 mycompany.com MX".

Question 13

In the classful addressing scheme, what range of network addresses is considered a Class B?
A) 1.x.y.z to 126.x.y.z
B) 128.0.x.y to 191.255.x.y
C) 192.0.0.x to 223.255.255.x
D) 224.x.y.z to 255.x.y.z

Accepted Answer

In the classful addressing scheme, the Class B network addresses range from 128.0.0.0 to 191.255.255.255.

Question 14

In the DNS hierarchy, where is information about how to find the top-level domain servers held?
A) In the hosts file on the local machine.
B) On the DNS root servers.
C) On DNS caching-only servers.
D) In the organization's forward lookup zone.

Accepted Answer

The DNS root servers hold information about how to find the top-level domain servers in the DNS hierarchy. The hosts file on the local machine contains static mappings of domain names to IP addresses, but it does not provide information about the DNS hierarchy. DNS caching-only servers store cached DNS records, but they do not provide information about the DNS hierarchy. The organization's forward lookup zone contains information about the domain names and IP addresses of hosts in the organization's network, but it does not provide information about the DNS hierarchy.

Question 15

When using DHCP for IPv6 (i.e. DHCPv6), what port do clients receive responses on?
A) port 67
B) port 68
C) port 546
D) port 547

Accepted Answer

Clients receive DHCPv6 responses on port 547.

Question 16

Encrypted control of remote computers using the RDP protocol is accomplished using what port number?
A) TCP 22
B) UDP 161
C) TCP 3389
D) UDP 10000

Accepted Answer

Encrypted control of remote computers using the RDP protocol is accomplished using TCP port number 3389. TCP is a reliable and connection-oriented protocol, and 3389 is the default port used by Remote Desktop Protocol (RDP) connections. UDP 161 is used by SNMP, TCP 22 is used by SSH, and UDP 10000 is used by network-based storage systems.

Question 17

What part of a MAC address serves as the extension identifier, or device ID?
A) The first 24 bits of the MAC address.
B) The last 24 bits of the MAC address.
C) The first 12 bits of the MAC address.
D) The last 12 bits of the MAC address.

Accepted Answer

The last 24 bits of a MAC address serve as the extension identifier or device ID, uniquely identifying the device within the manufacturer's network. This part is also known as the device or interface identifier.

Question 18

What type of IPv6 address is fe80::8cf1:2c42:ffde:da1c?
A) global address
B) link local address
C) multicast address
D) anycast address

Accepted Answer

The IPv6 address start with "fe80:" is a link-local address. It is used for communication between devices on the same link or network segment. Link-local addresses are automatically assigned to interfaces whenever a global address is assigned, and they are not routable beyond the link.

Question 19

What utility is used to verify that TCP/IP installed, bound to the NIC, configured correctly, and communicating with the network?
A) traceroute
B) ifconfig
C) ping
D) route

Accepted Answer

Ping is a utility used to verify TCP/IP installation, binding to the network interface card (NIC), and correct configuration. By sending a series of ICMP messages to a specified host, ping measures the round-trip time for messages to travel from the originating host to the destination, as well as any packet loss. This provides a good indication of the connectivity of the network. Traceroute is used to show the route packets take to reach a specified destination, Ifconfig is used to configure network interfaces, and Route is used to view and modify routing tables. While these utilities can be useful for troubleshooting network connectivity, none are as effective as ping in verifying TCP/IP installation and configuration.

Question 20

A Windows computer on your network is having issues resolving queries for a specific domain, but not other domains. Other computers on the same network resolve the name just fine. What command can you issue that might fix the problem?
A) ipconfig /renew
B) ipconfig /release
C) ipconfig /flushdns
D) ipconfig /refresh

Accepted Answer

The ipconfig /flushdns command clears the DNS resolver cache on the local computer, forcing it to re-query DNS servers for updated information. This can often fix issues with resolving specific domain names. Renewing or releasing the IP address is not relevant to resolving DNS queries, and the /refresh option is not a valid option for the ipconfig command.

Quiz 3: Addressing on Networks

In a DNS zone, what type of record holds the name-to-address mapping for IPv6 addresses?

You are setting up a DNS zone and have been asked to create SPF and DKIM records. What type of DNS record will hold this information?

What command can be used to check a domain computer's time source from a Command Prompt window?

You are troubleshooting a network issue on a client computer and discover that the network card has an IP address of 169.254.196.200. What does this mean?

What does the MX record do in a forward DNS zone?

Which of the following is NOT a range of IP addresses recommended for use in private networks?

How do routers create a broadcast domain boundary?

What is the ARPA domain suffix utilized for?

What statement regarding the Server Message Block protocol is accurate?

If a host's IPv6 address contains the network adapter's MAC address within the last 64 bits of the IPv6 address, what standard is being used?

Your supervisor has asked you to configure a new prototype network with a dual stack configuration. What does this mean?

You are troubleshooting a DNS issue on a Linux system, and need to test the resolution of your domain mycompany.com MX record using Google's DNS server with the IP address of 8.8.8.8. What dig command will accomplish this?

In the classful addressing scheme, what range of network addresses is considered a Class B?

In the DNS hierarchy, where is information about how to find the top-level domain servers held?

When using DHCP for IPv6 (i.e. DHCPv6) , what port do clients receive responses on?

Encrypted control of remote computers using the RDP protocol is accomplished using what port number?

What part of a MAC address serves as the extension identifier, or device ID?

What type of IPv6 address is fe80::8cf1:2c42:ffde:da1c?

What utility is used to verify that TCP/IP installed, bound to the NIC, configured correctly, and communicating with the network?

A Windows computer on your network is having issues resolving queries for a specific domain, but not other domains. Other computers on the same network resolve the name just fine. What command can you issue that might fix the problem?