Module 3: Addressing

3. What decimal number corresponds to the binary number 11111111 (eight ones)? a. 255 b. 256 c. 127 d. 11,111,111

a. 255

Which DNS server offers the most current resolution to a DNS query? a. Primary DNS server b. Root DNS server c. Caching DNS server d. TLD (top-level domain) DNS server

a. Primary DNS server

5. When your computer first joins an IPv6 LAN, what is the prefix of the IPv6 address the computer first configures for itself? a. FFOO::/8 b. ::1/128 c. 2000::/3 d. FE80::/64

d. FE80::/64

You have just set up a new wireless network at your house, and you want to determine whether your Linux laptop has connected to it and obtained a valid IP address. What command will give you the information you need?

ifconfig -a

You have decided to use SNAT (source network address translation) and PAT (port address translation) on your small office network. At minimum, how many IP addresses must you obtain from your ISP for all five clients in your office to be able to access servers on the Internet?

1 IP address.

What is the range of addresses that might be assigned by APIPA (automatic private IP addressing)?

169.254.0.1 through 169.254.255.254.

Suppose you want to change the default port for RDP (remote desktop protocol) as a security precaution. What port does RDP use by default, and from what range of numbers should you select a private port number?

By default, RDP uses port 3389. You should select a port in the range of 49152 to 65535, all of which are open dynamic and private ports.

Suppose you send data to the 11111111 11111111 11111111 11111111 IP address on an IPv4 network. To which device(s) are you transmitting? a. All devices on the Internet b. All devices on your local network c. The one device that is configured with this IP address d. No devices

b. All devices on your local network

Which part of a MAC address is unique to each manufacturer? a. The network identifier b. The OUI (organizational unique identifier) c. The device identifier d. The physical address

b. The OUI

You are the network manager for a computer training center that allows students to bring their own laptops to class for learning and taking notes. Students need access to the Internet, so you have configured your network's DHCP server to issue IP addresses automatically. Which DHCP option should you modify to make sure you are not wasting addresses used by students who have left for the day?

DHCP Issues.

You issue a transmission from your workstation to the following socket on your LAN (local area network): 10.1.1.145:53. Assuming your network uses standard port designations, what application layer protocol handles your transmission?

DNS over UDP (user datagram protocol).

When running a scan on your computer, you find that a session has been established with a host at the address 208.85.40.44:443. Which application layer protocol is in use for this session? What command-line utility might you use to determine the domain name of the other computer?

HTTPS (hypertext transfer protocol secure) is the application layer protocol in use for this session, and we can use nslookup to determine the domain name of the other computer.

Explain how the bits of an IPv6 address are organized and describe IPv6 shorthand notation.

IPv6 addresses contain 128 bits and are written as eight blocks of hexadecimal numbers.

FTP (file transfer protocol) sometimes uses a random port for data transfer, but an FTP server always, unless programmed otherwise, listens to the same port for session requests from clients. What port does an FTP server listen on?

Server-based FTP listens on port 21 and sends/receives data through port 20.

2. What type of device does a computer turn to when attempting to connect with a host with a known IP address on another network? a. Default gateway b. DNS server c. Root server d. DHCP server (dynamic host configuration protocol)

a. Default gateway

If you are connected to a network that uses DHCP, and you need to terminate your Windows workstation's DHCP lease, which command would you use? a. ipconfig /release b. ipconfig /renew c. ifconfig /release d. ifconfig /renew

a. ipconfig /release

You have just brought online a new secondary DNS server and notice your network-monitoring software reports a significant increase in network traffic. Which two hosts on your network are likely to be causing the increased traffic and why? a. The caching and primary DNS servers because the caching server is requesting zone transfers from the primary server b. The secondary and primary DNS servers because the secondary server is requesting zone transfers from the primary server c. The root and primary DNS servers because the primary server is requesting zone transfers from the root server d. The web server and primary DNS server because the web server is requesting zone transfers from the primary DNS server

b. The secondary and primary DNS servers because the secondary server is requesting zone transfers from the primary server

Which type of DNS record identifies an email server? a. AAAA record b. CNAME (canonical name) record c. MX (mail exchange) record d. PTR (pointer) record

c. MX record

Which of these commands has no parameters in Windows? a. ping b. ipconfig c. hostname d. nslookup

c. hostname

While troubleshooting a network connection problem for a coworker, you discover the computer is querying a nonexistent DNS server. What command-line utility can you use to assign the correct DNS server IP address?

nslookup (nameserver lookup)