Intro To Networking
What is the name of the domain controller database that Windows Server 2016 uses to store data about user access and resources on the network?
Active Directory
How many bits does an IPv6 address contain?
128
What process is used to establish a TCP connection?
Three-way handshake
What kind of tool can measure the distance to the location of damage in a cable?
Answers may include cable performance tester, line tester, certifier, or network tester.
To exchange information, two antennas must be tuned to the same
Frequency or channel
What is the fundamental distinction between a Layer 2 switch and a router?
A Layer 2 switch belongs only to its local network, and a router belongs to two or more networks.
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 does an FTP server listen on?
21
What database does a router consult before determining the most efficient path for delivering a message?
Its routing table
What is a twist ratio, and why is it important?
Twist ratio is the number of twists per meter or foot. The more twists per foot in a pair of wires, the more resistant the pair will be to crosstalk or noise.
When a wireless signal encounters a large obstacle, what happens to the signal?
The signal reflects, or bounces back, toward its source.
What is the fundamental distinction between a node and a host?
A host is a computer that hosts a resource on the network, and a node is any computer or device that can be addressed on the network.
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
Which Linux utility provides output similar to Wireshark’s?
tcpdump
What fiber is used in fiber-optic cabling to protect the inner core and prevent the cable from stretching?
Kevlar, a polymeric fiber
Which Wi-Fi frequency band offers 24 unlicensed communications channels in the United States?
5 GHz band
A user complains that he cannot access a particular website, although he is able to access other websites. At which layer of the OSI model should you begin troubleshooting this problem?
Application layer
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 (in interactive mode)
Which two protocols manage neighbor discovery processes on IPv4 networks?
ICMP and ARP
What is the difference between short circuits and open circuits?
A short circuit is one where connections exist in places they shouldn’t, while an open circuit is one where needed connections are missing.
What feature of a site survey maps the Wi-Fi signals and other noise in your location?
Heat map
At the Data Link layer, which type of network address is used to identify the receiving node?
Physical address, MAC address, hardware address, or Data Link layer address
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
Give three examples of routing metrics used by routers to determine the best of various available routing paths.
Answer: bandwidth, actual throughput, path latency (or delay), path load, MTU, cost, reliability, network topology
Why is SMF more efficient over long distances than MMF?
The core of SMF is much narrower than that of MMF, and reflects very little. The light does not disperse as much along the fiber.
802.11ac provides an advantage over 802.11n by incorporating increased channel bonding capabilities. What size channels does 802.11ac support?
20, 40, 80, and (optional) 160 MHz channels