CET-123 Midterm

Midterm exam for John Hoye's CET-123 @ KCC

What is the most common central device used today to connect computers to a network?

switch

What is the most common adapter or connector used to connect a computer to a wired network?

RJ45

Which of the following does a switch use for increased performance?

full duplex

What do you use to isolate a group of computers within your organization?

VLAN

What do you use to create VLANS?

switch

What zone is used to publish external websites for an organization?

DMZ

Which topology is the most redundant and the most expensive?

mesh

What standard describes CSMA/CD?

802

What mechanism do wireless networks use to access the network?

CSMA/CA

What model promises the most processing power?

distributive computing

Which model users a central database for authentication?

client/server

What type of server does Active Director run on?

network controller

Which model has each host have their own security database?

peer-to-peer

What type of communication is sent to a single designated host?

unicast

What is used to uniquely identify a host on a TCP/IP network?

IP address

A _ is a single computer or device that connects to a TCP/IP network.

Host / Node

What is the central device used in wireless LANS?

Wireless Access Point

What command do you use to test the TCP/IP stack onacomputer?

Ping localhost / Ping 127.0.0.1 / Ping loopback

You need to divide a network into three subnets. Which Device should you use?

Router

Connecting to a private Network address from a public network requires:

Network address translation (NAT)

What model is used to describe how data communication occurs between hosts?

OSI reference model

Which layer in the OSI model do MAC addresses and switches use?

Data Link

Which layer in the OSI model covers routing between networks?

Network

Which layer in the OSI model is used to verify that data was delivered without error?

Network

Which layer in the OSI model covers HTTP, FTP, and RDC?

Application

Which layer of the OSI model is used to create a connection so that a host can transfer files?

Session

Which layer of the OSI model includes VLANS?

Data Link

Which protocol do you use as the transport protocol for a video application?

UDP

Which port categories include inbound ports of HTTP, HTTPS, FTP, and DNS?

well-known ports

What layer in the OSI model is responsible for logging on and off?

Session

What layer in the OSI model is used to encrypt data?

Presentation

Which layer in the OSI model includes the cable and network adapters?

Physical

How many layers does the TCP/IP model have?

4

Which layer in the OSI model is included in the TCP/IP model?

Transport

Which protocol is used to translate IP addresses to MAC addresses?

ARP

What ports are defined above 49,152?

dynamic ports

A layer 3 switch is similar to a .

Router

TCP/IP and IPX/SPX are known as _ stacks.

Protocols

What is the advantage of UDP over TCP?

Less Overhead - Faster Performance

What are the seven layers found in the OSI model, in order?

Physical > Data Link > Network > Transport > Session > Presentation > Application

What is the maximum speed supported by 802.11b?

11 Mbps

One reason to incorporate VLANs in a network is to:

Reduce the number of nodes in a broadcast domain.

What is the minimum cabling requirement for a 100BaseTX network?

Category 5 UTP cable

A router's static route is set by the:

Network Administrator

What type of record does DNS use to find a mail service?

Mail Exchanger (MX) DNS record

How many bits are there in an Internet Protocol version 6 (IPv6) address?

128

In which OSI layer does routing occur?

network

The query protocol used to locate resources on a network is:

Lightweight Directory Access Protocol (LDAP).

What is the most common cable used today?

UTP

If you are making a crossover cable and one end is 568A, what should the other end be?

568B

If you want to connect a computer directly to another computer without using a switch, you use a .

crossover cable

You need to connect a twisted-pair cable to the back of a patch panel. What tool should you use?

punch-down tool

What is the minimum category of twisted-pair cable you need to support 100 Mbps?

Category 5

When you pick up your wireless phone, your computer drops network connectivity. What could be the cause of the problem?

(Radio Frequency Interference (RFI)

You are setting up a network within a warehouse using Category 6 UTP. However, parts of the network are down because of the heavy machinery used. What cable type should you use?

fiber

What do you call it when electrical signals jump to another set of wires?

crosstalk

What type of cable should be used as part of a fire code for a building?

plenum-rated

Which of the following is not a fiber connector?

RJ-45

Which of the following is a characteristic of single-mode fiber?

Single-mode fiber supports longer distances than multimode fiber.

Which protocol can be used to encrypt packets on the Internet?

HTTPS

What is the maximum speed supported by 802.11g?

54 Mbps

What of the following is not a characteristic of 802.11n?

RFI protection

Which is the most secure encryption used in wireless networks?

WPА2

What is used to identify a wireless network?

SSID

To test a cable, you would use a _.

Continuity tester

For organizations, using authentication for wireless networks is recommended.

802.1x

When a signal degrades as it runs through a wire, you have _.

Degradation

What mode users a wireless access point?

Infrastructure Mode

What command do you use to connect to a FTP server to download a file?

ftp

Which of the following is a public IP address?

68.24.78.221

What is the default subnet mask for a Class B network?

255.255.0.0

You have a host with the address of 180.24.45.120. To what class would this be address be assigned?

Class B

For IPv4, what class is used for multicasting?

Class D

What is the maximum number of hosts you can use for each subnet that belongs to a class C address?

254

What type of address is 202.23.2.255?

broadcast address

What type of address is used to send a single set of packets to multiple hosts?

multicast address

Which of the following is not a private address?

200.23.34.120

What type of address is 169.254.32.23?

APIPА

You have a computer that cannot connect to a server. When you look at the IP configuration, the host has an address of 169.32.54.2. What is the problem?

The host cannot find a DHCP server.

What defines the nearest router for a host?

default gateway

What server is used to translate host names to IP addresses?

DNS

What is used to remap private addresses to public addresses and back?

NAT

What do you call a smaller network that is part of a larger network?

subnet

You have a subnet mask of 255.255.240.0. What would the CIDR notation be?

/20

How many bits is an IPv6 address?

128

What type of address is 2001:4212:0000:34DB:0000:0000:0000:4231?

IPv6

A _ address is assigned by a DHCP server.

Dynamic

What is the loopback IP address?

127.0.0.1 & loopback

What IPv6 address incorporates IPv4?

Starting ::ffff:

The protocol maps IP addresses to a Media Access Control (MAC) address is:

Address Resolution Protocol (ARP).

A service that resolves NetBIOS names to IP addresses is:

Windows Internet Name Service (WINS).

What command displays the IP address, subnet mask, and default gateway of the system you are currently on?

ipconfig

What protocol does the ping command use to test network connectivity?

ICMP

What command do you use to clear the DNS cache on a local system?

ipocnfig / flushdns

What command do you use to test a system's IPv4 protocol stack?

ping 127.0.0.1

What command do you use to display active TCP or UDP connections?

netstat

What command is used to display NetBIOS over TCP/IP statistics?

netstat

What command clears the NetBIOS name cache table?

nbtstat -R

What command tests network connectivity while showing you each hop along the way?

tracert

What command tests network connectivity while showing you each hop along the way and the degree of packet loss?

pathping