Deck 8: Backbone Networks

Question 1

Routers operate at the application layer.

Answer 1

False

Question 2

Routers can only connect the same type of cable.

Answer 2

False

Question 3

The distribution layer of a backbone connects LANs together.

Answer 3

True

Question 4

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

Question 5

A switched backbone uses a bus topology

Question 6

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

Question 7

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

Question 8

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).

Question 9

A backbone network that connects many backbone networks spanning several buildings at a single location is often called an Internet backbone.

Question 10

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

Question 11

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.

Question 12

Routers connect two or more network segments that use the same or different data link protocols, but the same network protocol.

Question 13

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

Question 14

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

Question 15

Routers use network layer address to forward packets between network segments.

Question 16

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.

Question 17

A routed backbone tends to be used more for large networks than VLANs, although VLAN high speed switches and this new type of LAN-BN architecture are now being considered.

Question 18

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

Question 19

A hardware device that operates at the application layer is a router.

Question 20

The cable to connect BNs is usually twisted pair.

Question 21

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

A)Bridged backbones
B)Hubbed backbones
C)Multistation access unit backbones
D)Routed backbones
E)NIC backbones

Question 22

Routers:

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

Question 23

A subnetted or hierarchical backbone can also be called:

A)Bridged backbone
B)Virtual LAN
C)Hubbed backbone
D)Collapsed backbone
E)Routed backbone

Question 24

A key advantage of a chassis switch is its flexibility.

Question 25

Which of the following is not true about switched backbones?

A)network latency delay) is decreased in comparison to traditional bridged or routed) backbone networks
B)each connection into the switch is a separate point-to-point circuit which supports simultaneous access by the LANs connected to the switch
C)there are many more networking devices in a switched backbone network compared to the number of LANs attaching to it
D)use a star topology
E)the backbone essentially exists in the switch; there is no backbone cable

Question 26

Which of the following is not true about backbone networks?

A)They may also be called enterprise networks if they connect all networks within an organization.
B)They typically connect many networks, including LANs.
C)They typically provide connections to other BNs, WANs, MANs, and the Internet.
D)They may also be called campus networks if they connect many BNs spanning several buildings as a single location.
E)They tend to use lower speed circuits than LANs.

Question 27

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.

Question 28

A VLAN network assigns computers to LAN segments by hardware.

Question 29

Many routers have more sophisticated ACL software that enables the ACL to have different
rules for different interfaces,

Question 30

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 switches do
E)routers can choose the "best" route between networks for forwarding a packet

Question 31

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.

A)bridged backbone
B)virtual LAN
C)hubbed backbone
D)collapsed backbone
E)routed backbone

Question 32

VLANs provide faster performance compared to switched, collapsed or routed backbone architectures.

Question 33

Which of the following is a fundamental backbone network architecture?

A)Bridged backbone
B)Virtual LAN
C)Hubbed backbone
D)Gatewayed backbone
E)Virtual backbone

Question 34

Routers:

A)operate at the application layer
B)operate only at the physical layer
C)cannot connect two or more networks that use the same type of cable
D)may also be called TCP/IP gateways
E)operate only at the data link layer

Question 35

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

A)layer 3 switches
B)routers
C)dumb terminals
D)layer 2 switches
E)all of the above can be used

Question 36

Switches:

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

Question 37

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)switch the traffic based on layer 3 addresses
E)require much more management that do routed backbone networks

Question 38

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

A)access layer
B)distribution layer
C)decentralized layer
D)core layer
E)none of the options

Question 39

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

A)They switch messages based on their IP address.
B)They can be used in place of routers.
C)They function faster than routers.
D)They have more simultaneously active ports than routers.
E)They can only switch messages based on their data link layer addresses.

Question 40

A __________ type of BN has a star topology with a switch at its center resulting in all devices on the BN segment being part of the same IP network.

A)Bridged backbone
B)Virtual LAN
C)Hubbed backbone
D)Switched backbone
E)Routed backbone

Question 41

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

A)going from 100Base-T Ethernet to 10Base-T Ethernet
B)going from 100Base-T Ethernet to gigabit Ethernet
C)adding additional circuits alongside heavily used ones
D)replacing a shared circuit backbone with a switched circuit backbone
E)providing a faster circuit to the server

Question 42

Devices in a rack are connected together using ___________.

A)patch cables
B)string
C)servers
D)modules
E)chassis switches

Question 43

Which of the following is true regarding switched backbones?

A)They place all network devices for one part of the building physically in the same room, often in a rack of equipment
B)They have an advantage of requiring less cable
C)They make it more difficult to move computers from one LAN to another
D)Network capacity is always tied to the physical location of the computers
E)They are harder to maintain and upgrade than a BN that is not rack-based

Question 44

Which of the following is not true about multi-switch 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 frame belongs.
C)In some multi-switch VLANs, the Ethernet frame 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)VLAN configurations are limited to spanning over no more than two switches.

Question 45

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.

A)Bridged backbone
B)Virtual LAN
C)Hubbed backbone
D)Collapsed backbone
E)Routed backbone

Question 46

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

A)access layer composed of 10/100 layer 2 Ethernet switches
B)distribution layer composed of layer 3 Ethernet switches of 100 or 1000) Base-T
C)redundant switches
D)core layer composed of layer 3 Ethernet switches running 10 or 40) GbE over fiber
E)coax cabling throughout LANs and BN

Question 47

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

A)Access layer
B)Distribution layer
C)Core layer
D)Privacy layer
E)Switched layer

Question 48

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

A)server
B)NIC
C)cabinet
D)basement
E)rack

Question 49

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

A)Access layer
B)Distribution layer
C)Core layer
D)Privacy layer
E)Switched layer

Question 50

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

A)IEEE 802.1q standard
B)NIC interface
C)physical port on the switch
D)IEEE 802.3 standard
E)physical location of the computer

Question 51

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

A)enough ports
B)sufficient memory
C)twisted pair connections
D)large wheels
E)IEEE 802.11

Question 52

The biggest drawbacks to VLANs are their_________________.

A)cost and management complexity
B)size and contention
C)contention and cost
D)learning curve and contention
E)speed and size

Question 53

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

A)Access layer
B)Distribution layer
C)Core layer
D)Privacy layer
E)Switched layer

Question 54

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

A)multi-station device foundation
B)main distribution facility
C)manual data frequency
D)multiplexer downstream flow
E)maximum data facility

Question 55

VLANs prioritize traffic based on the ______.

A)IEEE 802.1q standard
B)IEEE 802.11 standard
C)VLAN size
D)multiswitch allocation
E)switch dynamics

Question 56

Network demand will not be reduced by:

A)restricting or moving) applications such as desktop videoconferencing
B)using network devices to ensure that broadcast messages do not go to other networks
C)encouraging the use of applications such as medical imaging
D)sending status information to all computers on all LANs in the backbone network
E)restricting or moving) applications such as multimedia

Question 57

As security becomes more important, most routers now have software that enables the network manager to create an) _______ that specifies what traffic the router should allow through and what traffic the router should block.

A)module
B)access control list
C)MDF
D)VLAN ID
E)VLAN tag

Question 58

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.

A) backbone
B) switched
C) routed
D)QoS
E)access

Question 59

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

A)upgrading memory for devices in the network
B)changing the demand placed on the network
C)adding new keyboards to the client computers
D)upgrading the circuits between devices
E)improving devices in the network

Question 60

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

A)using the same protocols in the backbone and the LANs
B)using static routing in low to moderate traffic conditions
C)ensuring that backbone devices have sufficient memory so that packets do not have to be retransmitted by the sender
D)translating packets from one protocol to another as they enter the BN
E)none of the options

Question 61

Describe how a VLAN works.

Question 62

List and describe five managerial factors to consider when selecting best practices for a backbone network design.

Question 63

What are some business trends we are seeing in backbone networks?

Question 64

What is a backbone network? What is typical of this kind of network?

Question 65

When might a router be useful than a switch?

Question 66

What are six actions that you might undertake as a network manager to improve backbone performance?

Question 67

_______ are the most secure type of backbone because they enable ACL and other security measures to be applied at the switch level.

A)VLANs
B)Switched backbones
C)Routed backbones
D)MDF backbones
E)Ethernet backbones

Question 68

What are the main benefits of Virtual LANs?

Question 69

Even though the access layer isn't part of the backbone, why is it important to the backbone?

Question 70

Describe how ACLs can be used to increase network security.

Question 71

Given network devices such as routers and switches, discuss three major technological trends that are helpful in explaining the differences between these devices.