Networking Chapter 7, Chapter 8, Chapter 9, Ch 10

The maximum download data rate for cable modem systems is currently

e. 150 Mbps

Which of the following new Internet efforts was started by 34 universities?

e. Internet2

Which of the following type of media is most commonly used in backbone networks because of its high capacity?

fiber

A hierarchical tree of domains within one organization that is linked to other trees in the organization is called a ___________.

forest

Asymmetric DSL uses ___________ multiplexing to create three separate channels over one local loop circuit.

frequency division

Which of the following is not a purpose for using hubs in a network?

to act as a communications server

________ is a type of WAN connection that uses the normal voice telephone network.

Dial-up service

VLANs prioritize traffic based on the ______.

IEEE 802.1q standard

Which of the following is not true about CSMA/CD?

It is used in token ring protocol LANs

Which of the following can provide fault tolerance for the storage space on a server?

RAID

Tier 1 ISPs connect together and exchange data at ___________.

a. IXPs

in a ring design WAN,

a. messages can take a long time to travel from the sender to the receiver

A _________ is a connection-oriented approach to sending packets on a packet switched service.

a. permanent virtual circuit

At the top of the Internet structure are tier 1 ___________, such as AT&T and Sprint.

b. Internet service providers

__________ is a term that refers to the speed in converting input packets to output packets.

b. Latency

In North America, a T1 circuit has ______ 64Kbps channels.

c. 24

At the DSL customer premises is a device called a(n)

c. DSL modem

WiMax was designed to easily connect into existing ___________.

c. Ethernet LANs

Most IP services use _______ as the data link layer protocol.

c. MPLS

Which of the following is not a basic architecture for dedicated circuit networks?

c. bus

In a packet switched network, permanent virtual circuits that look very similar to a _____________ (for hardware-based dedicated circuits) move packets through the network.

c. cloud-based mesh design

A star architecture:

c. connects all computers to one central computer that routes messages to the appropriate computer

SONET:

c. uses inverse multiplexing above the OC-1 level

The biggest drawbacks to VLANs are their_________________.

cost and management complexity

The _________ is the connection from a home or business to the telephone company end office.

d. local loop

A _____________ is a user's connection into a packet switched service.

d. packet assembly/disassembly device

Which of the following type of networks permit packets from separate messages to be interleaved?

d. packet switched network

A _________ is the place at which the ISP provides services to its customers.

d. point-of-presence

The maximum data rate of a an 802.11ad WLAN is

54 Mbps

802.11g is backward compatible with which type of LAN?

802.11b

The IEEE designation for the type of wireless standard that uses both the 2.4 and 5 GHz range is __________.

802.11n

Which of the following standards is backward compatible with IEEE802.11a, b, and g?

802.11n

Ethernet LAN was developed by:

DEC, Xerox, and Intel

WiGig is standardized as

IEEE 802.11ad

Most WiMAX providers in the US are using an effective data range of

a. 0.5 to 1.5 miles

_____________ is a common standard for use by layer 2 access VPNs for encapsulation.

a. L2TP

A high-speed Internet has a set of access points called ____pops that provide point-of-presence at ________ speeds.

a. giga, gigabit

Dynamic routing:

a. imposes an overhead cost by increasing network traffic

The performance of WANs can be improved by:

a. upgrading the circuits between the computers

Which of the following is not an effective way to reduce LAN network demand:

add hidden nodes

10Base-T: a. supports 10 Mbps data rate b. is inexpensive c. runs on twisted pair d. is more dominant than token ring e. all of the answers are correct

all of the answers are correct

Which of the following is not a potential bottleneck for LAN performance? a. number and speed of hard disks in the server b. amount of memory in the server c. speed of server's CPU d. network interface card e. all of the answers are potential bottlenecks for LAN performance

all of the answers are potential bottlenecks for LAN performance

_____________ is sometimes called a Layer 2.5 technology.

b. MPLS

Basic rate interface:

b. provides a communications circuit with two 64 Kbps B channels, plus one D channel

A _______________ is a particular type of network that uses circuits that run over the Internet but that appears to the user to be a private network.

b. virtual private network

The _________________ is a Canadian government agency that regulates voice and data communication.

c. CRTC

The ___________ is responsible for technical management of IETF and the Internet standards process.

c. Internet Engineering Steering Committee

A(n) __________ is used to connect a fiber optic cable from the cable TV company side to a coaxial cable on the customer side.

e. optical-electrical converter

When a computer transmits at the same time because it cannot sense that another computer on the WLAN is currently transmitting is referred to as the:

hidden node problem

Which of the following is not determined by a site survey?

the security of the WLAN

Which of the following is not true about switched backbones?

there are many more networking devices in a switched backbone network

Switch-based Ethernet:

usually enables all attached circuits to send or receive packets simultaneously

Hubs:

usually incorporate repeaters or amplifiers

A(n) _____________ is used in a computer to connect it to a WLAN.

wireless NIC

Which of the following is not true about switched Ethernet?

The switch has a physical bus topology.

Which of the following is not true about Layer-3 switches?

They can only switch messages based on their data link layer addresses.

Which of the following groups developed Internet 2?

UCAID

A subnetted or hierarchical backbone can also be called:

Routed backbone

_________ move packets along the backbone based on their network layer address.

Routed backbones

_________ is not a type of Ethernet specification.

Securenet

____ is the process of creating several logically separate servers on the same physical computer.

Server virtualization

________ is a hybrid version of Ethernet that uses either 10Base-T or 100Base-T.

10/100 Ethernet

How many channels does 802.11g provide for communication with clients,

3

The maximum data rate of an 802.11g WLAN is

54 Mbps

How many channels does the 802.11ac standard provide for communication between the access point and clients?

8

The backbone architecture layer that is closest to the users is the

Access layer

CSMA/CA is an acronym for:

Carrier Sense Multiple Access with Collision Avoidance

The _________ is the part of the backbone that connects the different backbones together.

Core layer

Which of the following is not one of the large interexchange carriers operating in North America today?

DSU

_____________ provide information about resources on the network that are available to the users, such as shared printers, file servers and application software.

Directory Services

__________ is not true with respect to network hubs.

Hubs provide a complicated way to connect network cables

Which of the following is not an ISP in either the United States or Canada?

ISOC

Which of the following is not true about 10/100 Ethernet?

It is not a hybrid type of Ethernet.

LAN bottlenecks are usually found at the:

LAN server and network circuit

___________ is how the network works conceptually.

Logical topology

With _____________, the AP permits the owner to provide a list of valid addresses that can connect.

MAC address filtering

_____________ is the software that controls the network.

Network Operating System

Which of the following is not a basic LAN component?

PAD

Using ______ capabilities, network managers can connect VOIP phones directly into a VLAN switch and configure the switch to reserve sufficient network capacity so that they will always be able to send and receive voice messages.

QoS

Which of the following is true regarding switched backbones?

They place all network devices for one part of the building physically in the same room, often in a rack of equipment

A _____________ type of BN is a new type of LAN/BN architecture made possible by intelligent, high speed switches that assign computers to LAN segments via software, rather than by hardware.

Virtual LAN

Which of the following is a fundamental backbone network architecture?

Virtual LAN

A second type of network that a wireless access point provides is a ______ that is secured by a separate password that is entered on a Web page when you first connect to the network.

WI-LO network

The data rate for a T-1 circuit in North America is:

a. 1.544 Mbps

OC-3072 has a data rate of

a. 159.25 Gbps

____________ are companies that build a data and telecommunications infrastructure from which other companies can lease services for WANs and MANs.

a. Common carriers

At the DSL local carrier's office, the __________ demultiplexes the data streams and converts them into ATM data.

a. DSLAM

Which of the following statements is true about DSL?

a. On a circuit, the shorter the distance, the higher the speed

With IP services, the ________ at the sending site takes the outgoing message (which usually is an Ethernet frame containing an IP packet), strips off the Ethernet frame and uses the IP address in the IP packet to route the packet though the carrier's packet‐switched network to its final destination.

a. PAD

Which of the following is not a benefit of packet switched services?

a. The data transmission rates tend to be lower than dial-up or dedicated circuits.

Ethernet/IP packet networks:

a. are supported with gigabit fiber optic networks in large cities

In general, tier 3 ISPs make money by charging ________.

a. customers

In a ring design WAN,

a. failure in one circuit means that the network can most likely continue to function

In ______ geometric layout for a network, every computer is connected to every other computer often by point-to-point dedicated circuits.

a. full mesh design

Primary rate interface:

a. is typically offered only to commercial customers

A __________ separates traditional voice telephone transmission from the data transmissions in the equipment located at the customer site for DSL.

a. line splitter

Which of the following is a primary advantage of a VPN?

a. low cost

Which of the following is not a key issue to be considered when selecting a WAN service?

a. prestige value of using a particular common carrier

Some of the new applications being developed for a high-speed Internet include

a.) Tele-immersion

A(n) ___________ is a radio transceiver that plays the same role as a hub or switch in a wired network and connects the WLAN to the wired network.

access point

Which of the following would be least effective in improving backbone performance?

adding new keyboards to the client computers

How can a set of 802.11b access points be configured to operate without interference?

assigning each access point a different channel to communicate with clients

The ________ is a large open international community of network designers, operators, vendors, and researchers concerned with the evolution of the Internet architecture and smooth operation of the Internet.

b. Internet Engineering Task Force

__________ has led to the belief that the Internet is "free".

b. Peering

___________ refers to the fact that ISPs do not charge one another (at the same level) for transferring messages they exchange across an NAP or MAE.

b. Peering

Which of the following is not part of the work of the Internet Society?

b. connecting optical-electrical converters

A star topology is:

b. dependent upon the capacity of the central computer for its performance

A ___________ is used by ISPs to authenticate its customers.

b. remote-access server.

Mesh networks:

b. require more processing by each computer in the network than in star or ring networks

Fiber to the Home uses

b. wavelength division multiplexing

A T1 level of ADSL has a maximum downstream rate of about _________ Mbps.

c. 1.5

WiMAX was designed to use the _______ frequencies.

c. 2.3 GHz, 2.5 GHz, and 3.5 GHZ

Internet2® is an organization of about _____ universities, corporations, government agencies, and organizations.

c. 400

The data rate for a T-3 circuit in North America is:

c. 44.376 Mbps

A ___________ is/are devices that permit a user to connect to a digital T-carrier service.

c. CSU/DSU

A DSL modem is also known as a:

c. DSL router

Data traffic from the customers premises is sent to a __________ which is located at the local carrier's end office.

c. DSLAM

In 1996, The National Science foundation provided $100 million to start the ___________ program to develop the very-high-performance Backbone Network Service.

c. Next Generation Internet

In a packet switched network, any packets transmitted that exceed the ______ are marked as being discard eligible (DE).

c. committed information rate (CIR)

For access to DSL, __________ equipment is installed at the customer location.

c. customer premises

A _______ is a connectionless method of sending data packets on a packet switched service.

c. datagram

With a virtual private network, users create permanent virtual circuits through the Internet called:

c. tunnels

1000 Base-T:

can run at either full- or half-duplex

Which of the following would not be part of an "ideal" backbone design for the future?

coax cabling throughout LANs and BN

A(n) _____________ is not a common type of dedicated server.

collision server

______________ are sometimes called private line services.

d. Dedicated-circuit networks

Peering has led to the emergence of a new organization type called the _______, which permits any ISP to connect to its network.

d. IXP

Which of the following is one of the tier 1 ISPs in North America?

d. Sprint

Digital _________ Line is a family of point-to-point technologies designed to provide high-speed data transmission over traditional telephone lines.

d. Subscriber

Which of the following is not a type of VPN?

d. T-1 VPN

_____ are dedicated digital circuits that are the most commonly used form of dedicated circuit services in North America today.

d. T-carrier services

A digital service offered by cable companies is the _________.

d. cable modem

A(n) ___________ contains a series of cable modems/multiplexers and converts the data from cable modem protocols into protocols needed for Internet traffic, before passing them to a router connected to an ISP POP.

d. cable modem termination system (CMTS)

In a cable modem environment, a _______ is used to combine Internet data traffic with ordinary TV video traffic and then send it back to the fiber node for distribution.

d. combiner

A headend is also referred to as a:

d. distribution hub

Another term for cable networks that use both fiber-optic and coaxial cable is __________.

d. hybrid fiber coax

In a DSL environment, local loops from many customers enter and are connected to the

d. main distribution center

Which of the following is not a way to reduce network demand?

d. moving data further from the applications and people who use them

Each state or Canadian province has its own ___________ to regulate communications within its borders.

d. public utilities commission

A ________ geometric layout connects all computers in a closed loop, with each computer linked to the next usually with a series of point-to-point dedicated circuits.

d. ring design

A _______ geometric layout for a WAN connects all computers to one central computer that routes messages to the appropriate computer, usually via a series of point-to-point dedicated circuits.

d. star design

The ___________ is where the organization housing its primary servers.

data center

If you have a low volume of message traffic on a small WAN or MAN, _________ service is recommended, but if you have a high traffic, large WAN or MAN, __________ service would be more cost effective.

dial-up, packet

When a person uses a regular modem to make a connection to an Internet service provider through POTS, the data travels over a:

dialed circuit

__________ antennas project a signal in only one direction and are most often used on the inside of an exterior wall pointing to the inside of the building for security reasons.

directional

A _________ is a group of related resources.

domain

The _____ contains the servers that are designed to serve data to customers and suppliers.

e-commerce edge

The _________operates like the IETF through small research groups focused on specific issues.

e. Internet Research Task Force

The closest the Internet has to an "owning" organization is the ___________.

e. Internet Society

Technologies that provide higher-speed communications than traditional modems (e.g., DSL) are known as ______________ technologies.

e. broadband

Network demand will not be reduced by:

encouraging the use of applications such as medical imaging

One advantage of _____________ is that no conversations between LAN and WAN protocols are needed.

ethernet to the home

A(n) ____________ allows many users to share the same set of files on a common, shared disk drive.

file server

Circuit capacity on a backbone network will not be improved by:

going from 100Base-T Ethernet to 10Base-T Ethernet

Of the following, which is not true about fiber optic cable?

it has a very low capacity

Switches:

learn addresses by reading the source and destination addresses

The ________ acts as a router at the front of the server farm.

load balancer

Associated with a switched backbone, MDF is an acronym for:

main distribution facility

_________ are smaller versions of NAPs that link a set of regional ISPs.

metropolitan area exchanges

__________ antennas transmit the signal in all directions.

omnidirectional

Running fiber optic cable into the home as an alternative networking technology to DSL is called:

passive optical networking

A logical bus topology:

permits every message to be received by every computer on the bus, even when those messages are intended for other computers

Another name for distributed coordination function (DCF) is __________.

physical carrier sense method

Computers can be assigned to a VLAN based on the ________.

physical port on the switch

Each of the circuits connected to a switch is a separate _______________ circuit connecting the switch to a device on the network.

point-to-point

The server version of the Network Operating System does not:

provide the software that performs the functions associated with the physical layer

10/100 Ethernet:

provides traditional 10 Mbps Ethernet connections to client computers utilizing traditional 10Base-T, with 100 Mbps generally used to the server

With a switched backbone network, the equipment is usually placed in a ______.

rack

A _____________ type of BN segments (each of which has a special set of subnet addresses that can be managed by different network managers) each part of the network connected to the backbone.

routed backbone

Two primary disadvantages to the ______ BN type are that the routers in the network impose time delays, and routers are typically more expensive and require more management than switches.

routed backbone

Which of the following is not a way that a router differs from a switch?

routers can connect two or more networks that use the same data link protocol

Which of the following is not an advantage of using Cat5 unshielded twisted pair for cabling LANs?

security (relative to fiber)

Most backbone devices are store-and-forward devices. One simple way to improve performance is to ensure that they have ________________.

sufficient memory

Internet 2 is also known as:

the Abilene network

Device performance on a backbone network will not be improved by:

translating packets from one protocol to another as they enter the BN

To increase the volume of simultaneous messages the LAN circuit can transmit from network clients to the server(s), you can:

upgrade to a bigger circuit

Switched backbone networks:

use a star topology with one device, usually a switch

_____________ refers to practice of writing symbols in chalk on sidewalks and walls to indicate the presence of an unsecured WLAN.

warchalking

IEEE 802.11ac runs on which of the following two different frequency spectrums simultaneously?

2.4GHz and 5GHz

Which of the following is not a WLAN standard?

802.3

A __________ indicates what resources on each server are available on the network for use by other computers and what people are allowed what access to the network.

network profile

A __________ type of BN has a star topology with one device, such as a switch, at its center.

Switched backbone

_________ have no backbone cable.

Switched backbones

Which of the following is not true about multiswitch VLANs? a. Several switches are used to build a VLAN b. The switches in the VLAN can send packets among themselves in a way that identifies the VLAN to which the packet belongs. c. In some multi-switch VLANs, the Ethernet packet is modified based on the emerging IEEE 802.1q standard. d. In some multi-switch VLANs, a new VLAN packet encapsulates the Ethernet packet. e. All of the above are true statements.

All of the above are true statements.

The _______ is the part of the backbone that connects the LANs together.

Distribution layer

Which of the following is not true about layer-2 switched Ethernet?

The physical topology is the same as the physical topology of shared Ethernet: a ring.

Which of the following is not true about backbone networks?

They tend to use lower speed circuits than LANs.

The type of logical topology that Ethernet uses is a:

bus

Media access control refers to:

controlling access to a media by more than one computer in a LAN

Which of the following is not a technology layer that is considered when designing backbone networks?

decentralized layer

Which of the following is not a type of hardware device that can be used to interconnect networks?

dumb terminals

The cheapest time to install network cabling is:

during the construction of the building

Routers:

may also be called TCP/IP gateways

A switch uses a _____________ that is very similar to a routing table used in a router.

forwarding table

Which of the following is a mode in which a switch operates:

fragment-free switching

Wired Ethernet is a _______________ technology for small SOHO devices, meaning that manufacturers are no longer creating new products. .

legacy

Many organizations today are installing traditional wired Ethernet for desktop users and install Wi-Fi as ______________.

overlay networks

Devices in a rack are connected together using ___________.

patch cables

If your LAN server is overloaded, which of the following should you not consider (to solve the server problem)?

replacing the cable with fiber optic cable

Routers:

require more management than switches

Breaking a network into smaller parts is called network:

segmentation

A ___ has a set of high-speed storage devices and servers that are networked together using a very high speed network.

storage area network