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
