Chapter 2 - Short Answer Flashcards
- Suppose you want to change the default port for RDP as a security precaution.
What port does RDP use by default, and from what range of numbers should you select a private port number?
3389; 49152 through 65535
- Which type of DNS record identifies a mail server?
MX
- How many bits does an IPv6 address contain?
128
- On what port is an IPv6 client listening for DHCP messages?
546
- The second 64 bits of an autoconfigured IPv6 address may either be random or generated from the computer’s MAC address, which contains 48 bits. What standard defines
the conversion of the MAC address to the IPv6 64-bit device ID?
EUI-64
- You issue a transmission from your workstation to the following socket on your LAN:
- 1.1.145:110. Assuming your network uses standard port designations, what Application layer protocol are you using?
POP3
- What protocol does a network gateway use to keep track of which internal client is talking to which external Web server?
Port Address Translation (PAT).
18. You are the network manager for a computer training center that allows clients to bring their own laptops to class for learning and taking notes. Clients need access to the Internet, so you have configured your network’s DHCP server to issue IP addresses automatically.
What DHCP option should you modify to make sure you are not wasting addresses that were used by clients who have left for the day?
DHCP lease
- What is the range of IP addresses that might be assigned by APIPA?
169.254.0.1 to 169.254.255.254.
- 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
- FTP 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 is the FTP server listening on?
21
- While troubleshooting a network connection problem for a coworker, you discover
that the computer has a static IP address and is giving a duplicate IP address error.
What command-line utility can you use to find out what other device may already be
using that IP address?
ping or nslookup
What is the IPv4 loopback address? What is the IPv6 loopback address?
127.0.0.1 and ::1/128
You have just set up a new wireless network in 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 and PAT 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
- If you know that your colleague’s TCP/IP host name is JSMITH, and you need to find
out his IP address, what command should you type at your shell prompt or command
Prompt?
nslookup jsmith or ping jsmith
When determining whether a local network has any NetBIOS traffic, do you use the nslookup utility in interactive mode or a packet analyzer such as Wireshark?
A packet analyzer such as Wireshark
List three signaling protocols discussed in the chapter that are used for communicating multimedia data.
SIP, H.323, and MGCP
- What version of the ping command do you use in Windows with IPv6 addresses?
What version do you use on a Linux system?
ping -6 and ping6
- When running a scan on your computer, you find that a session has been established
with a host at the address 208.85.40.44:80. Which protocol is in use for this session?
What command-line utility might you use to find out who the host is?
Port 80 indicates this is an HTTP session. And nslookup can identify the domain name of the host at that IP address.
