Ms ch 8

Switches and routers are devices that can connect networks to the BN. True False

True

Routers can only connect the same type of cable. true false

False

Switches: learn addresses by reading the source and destination addresses connect two ore more network segments that use different data link protocols operate at the physical layer only have become less popular than hubs connect two or more network segments that use different network protocols

learn addresses by reading the source and destination addresses

Associated with a switched backbone, MDF is an acronym for: maximum data facility main distribution facility multi-station device foundation manual data frequency multiplexer downstream flow

main distribution facility

One basic component of a backbone network is the hardware device that connects other networks to the backbone. true false

true

One difference between a switch and a router is that a router will only process messages addressed to the router (at layer 2), while a switch processes all messages. True False

true

The primary advantage of a routed backbone is that it clearly segments each part of the network connected to the backbone because each segment has its own subnet addresses that can be managed separately. true false

true

The backbone architecture layer that is closest to the users is the Distribution layer Switched layer Core layer Access layer Privacy layer

Access layer

The _______ is the part of the backbone that connects the LANs together. Core layer Access layer Distribution layer Privacy layer Switched layer

Distribution layer

_________ move packets along the backbone based on their network layer address. Hubbed backbones Multistation access unit backbones NIC backbones Routed backbones Bridged backbones

Routed backbones

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 They have an advantage of requiring less cable Network capacity is always tied to the physical location of the computers They make it more difficult to move computers from one LAN to another They are harder to maintain and upgrade than a BN that is not rack-based

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

Which of the following is not true about backbone networks? They tend to use lower speed circuits than LANs. They typically provide connections to other BNs, WANs, MANs, and the Internet. They typically connect many networks, including LANs. They may also be called campus networks if they connect many BNs spanning several buildings as a single location. They may also be called enterprise networks if they connect all networks within an organization.

They tend to use lower speed circuits than LANs.

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. Bridged backbone b. Virtual LAN c. Hubbed backbone d. Collapsed backbonee. Routed backbone

Virtual LAN

Which of the following is a fundamental backbone network architecture? Virtual LAN Virtual backbone Hubbed backbone Bridged backbone Gatewayed backbone

Virtual LAN

Routers: typically do not require any configuration by the network administrator use data link layer addresses to move packets that leave the subnet typically require only one TCP/IP address connect different IP networks or subnetworks do less processing on packets than a layer 2 switch does

connect different IP networks or subnetworks

The biggest drawbacks to VLANs are their_________________. learning curve and contention speed and size cost and management complexity contention and cost size and contention

cost and management complexity

Which of the following is not a technology layer that is considered when designing backbone networks? core layer distribution layer none of the options access layer decentralized layer

decentralized layer

Which of the following is not a type of hardware device that can be used to interconnect networks? routers layer 2 switches dumb terminals all of the above can be used layer 3 switches

dumb terminals

Network demand will not be reduced by: encouraging the use of applications such as medical imaging restricting (or moving) applications such as desktop videoconferencing sending status information to all computers on all LANs in the backbone network restricting (or moving) applications such as multimedia using network devices to ensure that broadcast messages do not go to other networks

encouraging the use of applications such as medical imaging

A VLAN requires the computer manager to reconfigure the physical cables to the switch if a computer is moved from one port to another port on a switch. True False

false

Backbone networks typically use lower speed circuits to interconnect a series of LANs and provide connections to other backbone networks. true false

false

Layer-3 switches switch messages based on their data link layer address. true false

false

One advantage of a routed backbone is that is requires little management. true false

false

Routed backbones use switches that move packets based on data link layer addresses. True False

false

a hardware device that operates at the application layer is a router\ true false

false

a switched backbone uses a bus topology true false

false

Computers can be assigned to a VLAN based on the ________. physical port on the switch physical location of the computer IEEE 802.3 standard NIC interface IEEE 802.1q standard

physical port on the switch

with a switched backbone network, the equipment is usually placed in a___. rack NIC server basement cabinet

rack

which of the following is not a way that a router differs from a switch a. routers can connect two or more networks that use the same data link protocol b. routers only process messages that are specifically addressed to it c. routers operate at the network layer d. routers perform more processing on each message than switch e. routers can choose the "best" route between networks for forwarding a packet

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

Which of the following is not true about switched backbones? the backbone essentially exists in the switch; there is no backbone cable there are many more networking devices in a switched backbone network compared to the number of LANs attaching to it network latency (delay) is decreased in comparison to traditional (bridged or routed) backbone networks each connection into the switch is a separate point-to-point circuit which supports simultaneous access by the LANs connected to the switch use a star topology

there are many more networking devices in a switched backbone network compared to the number of LANs attaching to it

A backbone network is a high-speed network that connects many networks. True False

true

A key advantage of a chassis switch is its flexibility. True False

true

A room that contains a rack of equipment for a rack-based collapsed backbone is also called the main distribution facility (MDF) or central distribution facility (CDF). true false

true

Switched backbone networks: a. always use a ring topology b. are the least common type of BN used in one building c. use a star topology with one device, usually a switch d. have a great deal of cable in their backbones e. tend to have less cable, but more network devices

use a star topology with one device, usually a switch