Chapter 8 Backbone Networks
Routers use network layer address to forward packets between network segments.
True
A switched backbone uses a bus topology
False
Routers
may also be called TCP/IP gateways
A backbone network that connects many backbone networks spanning several buildings at a single location is often called an Internet backbone
False
A hardware device that operates at the application layer is a router
False
Backbone networks typically use lower speed circuits to interconnect a series of LANs and provide connections to other backbone networks
False
Layer-3 switches switch messages based only on their data link layer address.
False
One advantage of a routed backbone is that is requires little management.
False
Routed backbones use switches that move packets based on data link layer addresses
False
Routers can only connect the same type of cable
False
Routers operate at the application layer
False
The cable to connect BNs is usually twisted pair.
False
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
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
Routers connect two or more network segments that use the same or different data link protocols, but the same network protocol.
True
Switches and routers are devices that can connect networks to the BN.
True
The distribution layer of a backbone connects LANs together.
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
VLANs provide faster performance compared to switched, collapsed or routed backbone architectures
True
Which of the following is not true about multi-switch VLANs?
VLAN configurations are limited to spanning over no more than two switches
_______ are the most secure type of backbone because they enable ACL and other security measures to be applied at the switch level
VLANs
The backbone architecture layer that is closest to the users is the
Access layer
The _________ is the part of the backbone that connects the different backbones together.
Core layer
The _______ is the part of the backbone that connects the LANs together.
Distribution layer
A VLAN network assigns computers to LAN segments by hardware
False
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.
False
VLANs prioritize traffic based on the ______.
IEEE 802.1q standard
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
A subnetted or hierarchical backbone can also be called
Routed backbone
_________ move packets along the backbone based on their network layer address.
Routed backbones
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.
Switched backbone
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 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
Which of the following is not true about backbone networks?
They tend to use lower speed circuits than LANs
A backbone network is a high-speed network that connects many networks
True
A key advantage of a chassis switch is its flexibility.
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
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.
True
Many routers have more sophisticated ACL software that enables the ACL to have different rules for different interfaces
True
One basic component of a backbone network is the hardware device that connects other networks to the backbone
True
Which of the following is a fundamental backbone network architecture?
Virtual LAN
As security becomes more important, most routers now have software that enables the network manager to create a(n) _______ that specifies what traffic the router should allow through and what traffic the router should block.
access control list
Which of the following would be least effective in improving backbone performance?
adding new keyboards to the client computers
Which of the following would not be part of an "ideal" backbone design?
coax cabling throughout LANs and BN
Routers
connect different IP networks or subnetworks
The biggest drawbacks to VLANs are their_________________.
cost and management complexity
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
Network demand will not be reduced by:
encouraging the use of applications such as medical imaging
Circuit capacity on a backbone network will not be improved by:
going from 100Base-T Ethernet to 10Base-T Ethernet
Switches
learn addresses by reading the source and destination addresses
Associated with a switched backbone, MDF is an acronym for:
main distribution facility
Devices in a rack are connected together using ___________.
patch cables
Computers can be assigned to a VLAN based on the ________.
physical port on the switch
With a switched backbone network, the equipment is usually placed in a ______.
rack
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
Most backbone devices are store-and-forward devices. One simple way to improve performance is to ensure that they have ________________.
sufficient memory
Which of the following is not true about switched backbones?
there are many more networking devices in a switched backbone network compared to the number of LANs attaching to it
Device performance on a backbone network will not be improved by:
translating packets from one protocol to another as they enter the BN
Switched backbone networks:
use a star topology with one device, usually a switch
