OS and Networks Final

A signal has just been recieved from the WAN link on your network. Using the given components , which of the following shows the path that the signal would take form the WAN to a workstation on your network? Assume all components are used at least once and that some componenets may be used more than once. 1 - backbone cabling 2 - entrance facility 3 - MDF 4- horizontal wiring 5 - IDF 6 - work area

2, 1, 3, 1, 5, 4, 6

Which of the following is an invalid IP address/prefix to assign to a host? a. 10.255.0.0./8 b. 172.31.0.255/16 c. 201.18.149.32/26 d. 172. 16.255.128/25

201.18.149.32/26

What is the decimal equivilant to the binary number 11100000

224

What is the difference between a LAN and a WAN?

A LAN is a group of computers connected by a network device, such as a hub or switch, that is located in a small area, such as an office building. LAN connections usually have high data transfer rates and use UTP cabling. A WAN is a network that covers a much larger area. It can be in the same state, or across several states, or across several countries. It usually connects several LANs together using high-speed, oublic communication links that are typically very expensive

What is the difference between a client operating system and a server operating system?

A client operating system is designed mainly to run user aplications like a word processor or spreadsheet program and to access network resouces like file servers or internet. A server operating system is designed to provide clients with access to network resources such as directory services, shared files, and e-mail

What is broadcast frame?

A frame at which signal is sent to a host to later be viewed

Which part of the network communication process is responsible for sending a recieving data to and from the network media?

A network interface

Which protocol is responsible for determining the MAC address associated with each IP address and keeping a table of its results?

ARP

In wireless networks, what type of media access control is used?

CSMA/CA

What is the function of DNS, and at which layer does it operate?

DNS allows computers to contact other computers using a familiar name instead of hard-to-remember IP address. DNS keeps records of which name corresponds to whichIP address in a DNS cache so that a frequently accessed address can be resolved quickly. DNS is an Application layer protocol.

What does a switch do if it doesn't find the destination MAC address in its switching table?

It forwards the frame to all ports

How does a switch "learn" MAC addresses?

It reads the source address and keeps a record of which port the sending computer is on

How does a switch "learn" MAC addresses?

It reads the source adress and keeps a record of whichport the sending computer is on

A MAC address is composed of two 24-bit numbers. What does the first 24-bit number represent

It's the organizationally unique identifier

What component of the computer provides it with a MAC address?

NIC

Before a computer can transmit data on a wireless network in some cases, it must send what type of signal to the AP?

RTS

If you want a computer to be assigned the same IP adress each time an address is assigned, waht DHCP option should you configure?

Reservation

describe twisted-pair cabling

STP or UTP. Compes in shielded twisted pair and universal twisted pair cabling

Which of the following is NOT an Application layer protocol? a. TCP b. SMTP c. DNS d. DHCP

TCP

What does a switch store in its switching table?

The source MAC address of a frame and the port it was recieved on

T/F A networks physical topology referes to the arrangement of the cabling and how the devices connect to each other.

True

The XYZ company has two offices, one in Chicago, and a brand new office in Puttsburgh. To connect the two offices, they will need a dedicated line, probably leased from the phone company. What type of network will they be implementing to connect their two offices?

WAN

You're the network administator for a company located in Arizona that has just opened an office in Texas. You need to make sure that the two ocations can communicate. What type of network are you implemeting?

WAN

Breiefly describe the three-way handshake that TCP uses to establish a connection

When a client computer makes a request, TCP begins the session by sending the recieving computer, which is typically a server, a SYN segment. If the server is not busy, then it sends back an ACK-SYN packet acknowledging the creation of the session. Then the client computer sends back an ACK segment to finalize the connection.

When a wireless computer uses a peer-to-peer connection to directly connect to another wireless computer, it is operating in what mode?

ad hoc

Each cable type can transport data at a particular speed only so far before its signals begin to weaken past the point that a recieving station can read them accurately. What is the term for this phenomenon?

attenuation

What is in an Ethernet frame's trailer?

cyclic redundancy check

Which of the following is the correct order of DHCP packets when a computer requests its IP adress configuration? a.DHCPOffer, DHCPRequest, DHCPDiscover, DHCPack b. DHCPRequest, DHCPDiscover, DHCPOffer, DHCPack c. DHCPDiscover, DHCPequest, DHCPOffer, DHCPack d. DHCPDiscover, DHCPOffer, DHCPRequest, DHCPack

d. DHCPDiscover, DHCPOffer, DHCPRequest, DHCPack

The enterance facility is the place where the connection to a WAN is located. It is the point where the LAN equipment ends and a third-party provider's equipment and cabling begins. What is another name for this point

demarcation point

A __ is a collection of users and computers whose accounts are managed by Windows servers called domain controllers

domain

A collision can ocur on a switch only if the switch is operating in full-duplex mode

false

T/F The decimal equivalent of the binary number 10000001 is 133

false

T/F The first packet in the four-packet exchange between a DHCP client and server is the DHCP request

false

You have just started a new business. You need to have three t four workstations available for your employees who simply need to share some files and a printer, but you don't have a large budget. Security is not a major concern, but costs are. What type of network woud be the most appropriate for you situation?

peer-to-peer network

Which of the following is the physical topology that is daisy-chained like a bus and in which the cabling is brought around from the last device to the first device?

physical ring

______ are sets of rules and procedures that dictate communication and behavior

protocols

_____ is a way of breaking a large address space into more smaller, address spaces

subnetting

Which of the following connections might require a crossover cable?

switch to switch

What is the most common topology and technology combination in use today?

switched/ethernet

Which of the following is NOT one of the main differences between the types of network cabling?

the ability to send and recieve signals

Which of the following are features of a router? .Connects computers to the LAN .Connects LANs to one another .Works with MAC addresses .Forwards broadcast packets .Works with packets instead of frames

.Connects LANs to one another .Works with Packets instead of frames

.Devices that uses MAC addresses to determine the destination of frame .Device that connects LANs .Device that connects a computer with the network medium .Device that only regenerates incoming signals .Communication in which a device can send and recieve signals but not at the same time .Device that connects wireless computers .Device that connects multiple computers but regenerates signals out all ports .Amount of data that can be transferred on a network .How devices connected to a hub use network bandwidth .How devices connected to a switch use network bandwidth

.switch .router .network interface card .repeater .half-duplex mode .access point .hub .network bandwidth .bandwidth sharing .dedicated bandwidth

Your network address is 192.168.100.0 What prefix allows you to assign 30 host addresses? a. /27 b. /28 c. /30 d. /29

/27

In an MDI device, which two pins does the device use to transmit?

1 and 2

What is the maximum cable length for both category 5e and category 6 UTP cable?

100 m

What is the maximum bandwidth for a network cabled using category 5e UTP cable?

1000Mbps

If your original network address with prefix is 172.16.0.0/16, what should your new network address with prefix be if you need 16 subnets? a. 172.16.0.0/24 b. 172.16.16.0/16 c. 172.16.0.0/20 d. 172.16.0.0/28

172.16.0.0/20

Your computer's IP address is 201.18.149.37/28. Which of the following is a valid default gateway for this address? a. 201.18.149.32 b. 201.18.149.48 c. 201.18.149.17 d. 201.18.149.46

201.18.149.46

How many host addresses are available on a Class C network?

254

Which subnetmask should you use if you want 16 bits of host address space? a. 255.255.0.0 b. 255.16.0.0 c. 255.255.255.0 d. 255.255.255.16

255.255.0.0

What is the IEEE standard governing wireless networking?

802.11

What does a router keep in its routing table?

A router keeps information about the networks it knows about and which interface that network can be reached from in its routing table

What is a server-based network, and what are it's advantages and disadvantages?

A server based network is a network that has certain computers that take on the role of servers, and all the other computers act as clients. the advantages are centralized control over network resource,s better security, easy expandability , and no limitations to the number of users. The disadvantages include higher costs for equipment and software, the need for administrative personnel to maintain network resources, and the fact that a single computer could casue the entire network to fail.

When would you use a straight-through cable and when would ou use a crossover?

A straight-through cable is used between a computer and a switch or hub and between a switch or hub and a router. A crossover cable is used between like devices, devices that transmit and recieve on the same pins - computer to router, computer to computer, or switch to switch. Another way to put it is that a straight0through cable is used to connect an MDI device to an MDI-x device and a crossover is used to connect two MDI devices or two MDI-x devices

____ is used to resolve a logical (IP) address to a physical (MAC) address

ARP

Brielfy describe ARP, include the meaning of its acronym and the layer in which it functions.

ARP stands for Address Resolution Protocol, and it functions in the internetwork layer. ARP's job is to find the MAC address of a device given its IP address.

What is CSMA/CD and how does it work?

CSMA/CD is the media acces method used by Ethernet which is a set of rules that govern how and when a device an transmit on an Ethernet network. When two devices transmit a signal at the same time, they cause a collision to occur. Then the devices must try to transmit again, and again, causing a bottleneck. To avoid these collisions, CSMA/CD says that a device must first listen to see whether it can detect any other signal on the medium. If no other signal is detected, then the device can transmit. If another device transmits at the same time and a collision occurs, then both transmitting stations must wait for a random period before they can try to transmit again.

T/F The physical bus topology is no longer used because it required extra cable to connect all the computers and required a central device

False

Which structured cabling component provides connectivity to computer equipment in the nearby work area?

IDF

A MAC address is composed of two 24-bit numbers. What does the first 24-bit number represent?

It's the organizationally unique identifier

The ___ address is composed of two 240bit numbers.

MAC

Every NIC has a unique address that consists of a 12-digit hexadecimal value. What is this address called?

MAC address

Which protocol is used to access a Windows computer remotely using the Windows graphical user interface?

RDP

What is structured cabling and what are its six components

Structured cabling is a standard that specifies how cabling should be installed in a network. It is based on an extended star physical topology. It includs the work area, horizontal wiring, telecommunications closet, equipment rooms, backbone cabling, and enterance facilities

What is the difference between TCP and UDP?

TCP and UDP are both Transport layer protocols, but TCP is considered reliable and UDP is considered unreliable. TCP is connection-oritented, which means that it forms a connection before it transmits data, thereby ensuring that the recipient is ready and waiting. The sender also waits for acknowledgements after sending data. This behavior makes it reliable. UDP is connectionless, so it sends data and doesn't wait to see whether anyone is listening; no acknowledgments are involved in the communication

What are the key differences between a switch and a router?

The following points summarize the key properties and features of a router versus a switch: Routers connect LANs, and switches connect computers. Routers work with logical (IP) addresses rather than physical (MAC) addresses, as switches do Routers work with packets rather than the frames that switches work with. Routers dont forward broadcast packets, but switches do. Routers use routing tables, and switches use switching tables.

What are the major differences between a hub and a switch

The major differenceis that switches are intelligent. They examine each frame that they recieve for the destination MAC address and then send the frame out the correct port for that address. A hub simply accepts a frame from one of its ports and tehn sends it out all ports. A switch also keeps a table of MAC addresses so that it knows where to send a frame. Because a switch can control where it sends a frame, devices that are connected to a switch can communicate at the same time, allowing each device to access the full network bandwidth. With a hub, only one device can transmit at a time so the bandwidth is shared among all connected devices. Also, because a switch controls the flow of frames, there is little chance of collision. In a hub, collisions might occur frequently when under heavy use.

T/F Because fiber-optic cabling uses light pulses instead of electrical signals, it is immune to interference and highly resistant to eavesdropping.

True

T/F Routers do not forward broadcast packets

True

T/F The function of a repeater is to extend the range of an existing network

True

In a physical bus topology, what do the ends of the cable have to be terminated?

When data is sent onto the network in a physical bus topology, it continues to travel the length of the network until it loses strength or until it is absorbed by a device. Once the signal reaches the end of the cable, it will bounce back and interfere with the other signals that follow it. To eliminate this signal distortion, the ends are terminated with a material that absorbs the signal so that it cannot bounce back

What is a result of absorption on a WI-Fi signals?

attenuation

What is the term used that defines network cabling between the IDF and MDF?

backbone cabling

When referring to network bandwidth, what is the basic unit of measurement?

bits per second

A ___ frame is a message that is intended to be processed by all devices on the LAN

broadcase

Which of the following is NOT a field in an ethernet frame? a. Type b. FCS c. Time-to-Live d. Source MAC

c. Time-to-Live

Windows 7 and Windows 10 are examples of which of the following?

client operating systems

Which of the following are features of a router? (Choose all that apply) a. Works with MAC addresses b. connects computers to the LAN c. connects LANs to one another d. forwards broadcast packets e. works with packets instead of frames

connects LANs to one another works with packets instead of frames

When copper wires are bundled together, they are susceptible to ___, a form of interference where the signals leak out onto other wires.

crosstalk

Which type of interference is caused by wires in the same cabling bundle?

crosstalk

T/F an extranet is a private network, such as a school or company network, in which the devices and servers are available only to users connected to the internal network

false

the length o cable between the wall jack and a patch panel is called vertical cabling

false

What type of wiring should be used for a high-speed connection between two buildings?

fiber-optic cabling

A switch operating in ______ mode can send and receive data at the same time

full-duplex

What are you likely to find in a DNS zone?

hostname-IP address pairs

A wireless access point is most like which other network device, in that all computers send signals through it to communicate with other computers?

hub

What does a switch do if it doesn't find the destination MAC address in its switching table?

it forwards the frame to all ports

What type of logical topologyis at work when using an Ethernet hub?

logical bus

A __ topology is fully redundant and is the most expensive to implement

mesh

An IP address is composed of two parts, one is the ___ ID and one is the host ID

network

Air Waves are an example of what type of network component?

network medium

Before data is transmitted, it is broken into chunks of data and then encapsulated with the source and destination IP addresses to create a...

pakcet

Which of the following is a length of cable that connects a computer to either a networking device or to and RJ-45 jack?

patch cable

What does a switch store in its switching table?

the source MAC address of a frame and the port it was recieved on

TCP establishes a connection with the destination device using which process

three-way handshake

The four layers of TCP/IP protocol suite are application, ____, internetwork, and network access

transport

T/F In order to find out your MAC address, you should open a command prompt and type ipconfig /all.

true

T/F The transport layer uses port numbers to identify the source and destination application-layer protocol of the data that it contains

true

There are two different network models. One of them, a peer-to-peer network, also is referred to as a ___ network

workgroup