CH.8 - TB
(T/F) The distribution layer of a backbone connects the LANs together
T
(T/F) ATM uses permanent addresses.
F
Port-based VLANs use the __________ layer port number to form the VLAN groups. a. physical b. data link c. network d. transport e. application
A
A rack-based collapsed backbone: a. places all network devices for one part of the building physically in the same room, often in a rack of equipment b. has an advantage of requiring less cable c. makes it more difficult to move computers from one LAN to another d. means that network capacity is always tied to the physical location of the computers e. is harder to maintain and upgrade than a BN that is not rack-based
A
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
A
Routed backbones: a. require a lot of management b. are not susceptible to time delays c. use data link layer addresses to move packets that leave the subnet d. require only a few set of TCP/IP addresses e. don't need much time to establish separate subnet addresses for each LAN
A
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 more popular than layer 2 switches
A
Which of the following devices is the most complex? a. Gateway b. Router c. Layer 3 switches d. Switch e. Multiprotocol router
A
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
A
_________ have no backbone cable. a. Collapsed backbones b. Cloud routed backbones c. Hubbed backbones d. Bridged backbones e. Multistation access unit backbones
A
____________ routers can understand different network layer protocols. a. Multiprotocol b. 3270 emulation c. ASCII/EBCDIC d. Asynchronous e. Bridge-
A
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
B
ATM is __________ so that all packets travel in order through the virtual circuit. a. synchronous b. connection-oriented c. sequence multiplexed d. time multiplexed e. connectionless
B
Associated with a rack-based collapsed 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
B
Gateways: a. process all messages, even if the messages are not explicitly addressed to them b. can translate one network protocol into another c. are less complex than bridges d. are most often used as the interface between two or more networks that have similar data link and network layer protocols e. cannot perform a routing function
B
Gigabit Ethernet is not: a. the newest technology used in LANs and backbones b. rarely found in backbones at the present time c. usually run over fiber d. found in 1 GbE, 10 GbE and 40GbE formats e. likely to replace ATM in the backbone
B
MAC-based VLANs use the _________ layer address to form the VLAN groups. a. physical b. data link c. network d. transport e. application
B
The header of an ATM cell is comprised of _____ bytes of address and control information, such as Quality of Service. a. 3 b. 5 c. 35 d. 48 e. 53
B
With ATM, The path defined between sender and receiver, which is used for communication is called a ____________. a. route b. virtual circuit c. ATM path d. VLAN e. ATM LANE
B
______ means that the data transmission rate in the circuit will vary and the application is tolerant of delays. a. Variable bit rate-real time b. Variable bit rate-nonreal time c. Available bit rate d. Unspecified bit rate e. Constant bit rate
B
ATM defines _________ service classes (for Quality of Service routing/switching) that enable the network to prioritize transmissions. a. three b. four c. five d. seven e. nine
C
Collapsed 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
C
IP-based VLANs use the _______ layer address to form the VLAN groups. a. Physical b. data link c. network d. transport e. application
C
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. restricting (or moving) 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
C
Used with ATM networks, MPOA is an acronym for: a. Multi-Point Overhaul Asynchronous b. Multiprocessing on Access c. Multiprotocol over ATM d. Multiplexing over Address e. Multiplexing on Asynchronous
C
Which of the following is not a fundamental backbone network architecture? a. Bridged backbone b. Virtual LAN c. Hubbed backbone d. Collapsed backbone e. Routed backbone
C
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 above
C
Which of the following is not true about collapsed backbones? a. performance is improved over 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 collapsed backbone network d. if the switch fails, so does the entire backbone network e. the backbone essentially exists in the switch; there is no backbone cable
C
Which of the following would be least effective in improving backbone performance? a. improving the computers in the network b. changing the demand placed on the network c. adding new keyboards to the client computers d. upgrading the circuits between computers e. improving devices in the network
C
__________ refers to the way in which backbone interconnects the network attached to it and how it manages the way in which packets from one network move though the backbone to other networks. a. Traffic architecture b. Network design c. Backbone architecture d. Distribution layer e. Core layer
C
A __________ type of BN has a star topology with one device, such as a switch, at its center. a. Bridged backbone b. Virtual LAN c. Hubbed backbone d. Collapsed backbone e. Routed backbone
D
ATM uses _______ -byte cells. a. 39 b. 44 c. 48 d. 53 e. 34
D
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 above
D
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
D
Which IEEE standard inserts a 16-byte VLAN tag into a normal Ethernet packet? a. 802.11 b. 802.5 c. 803.3 d. 802.1q e. 802.11g
D
Which of the following can be used for network capacity allocation? a. port-based VLANs b. MAC-based VLANs c. IP-based VLANs d. application based VLANs e. FDDI
D
Which of the following is not a type of hardware device that can be used to interconnect networks? a. switches b. routers c. multiprotocol routers d. 'dumb' terminals e. gateways
D
Which of the following is not a way in which computers attached to a VLAN switch can be assigned to the specific virtual LANs inside them? a. IP-based b. Port-based c. MAC-based d. ATM-based e. Application-based
D
Which of the following is not an ATM class of service? a. variable bit rate - real time b. variable bit rate - non-real time c. unspecified bit rate d. iso-synchronous bit rate e. available bit rate
D
Which of the following is not true with respect to ATM? a. It uses fixed length packets, or cells. b. It is also known as Cell Relay. c. It provides no error correction to user data. (that is left to software at the source and destination) d. It is not a switched network. e. It uses a different type of addressing from traditional data link protocols because it uses virtual circuit identifiers.
D
________ means that the circuit has no guaranteed data rate. a. Variable bit rate-real time b. Variable bit rate-nonreal time c. Available bit rate d. Unspecified bit rate e. Constant bit rate
D
_________ 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
D
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. a. bridged backbone b. virtual LAN c. hubbed backbone d. collapsed backbone e. routed backbone
E
A subnetted or hierarchical backbone can also be called: a. Bridged backbone b. Virtual LAN c. Hubbed backbone d. Collapsed backbone e. Routed backbone
E
Policy-based VLANs use the _______ layer address to form the VLAN groups. a. physical b. data link c. network d. transport e. application
E
Which of the following is an advantage of the traditional BN approach over collapsed backbone design? a. throughput is much higher in a traditional design BN b. traditional design BNs require far fewer networking devices c. traditional design BNs have much simpler network management d. much more cable is used in traditional design backbone networks e. if one networking device fails, the entire BN does not fail
E
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.
E
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.
E
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 packet belongs. c. In some multi-switch VLANs, the Ethernet packet is modified based on the emerging IEE 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
E
Which of the following would not be part of an "ideal" backbone design for the future? 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
E
__________ means that the circuit must provide a constant, predefined data rate at all times. a. Variable bit rate-real time b. Variable bit rate-nonreal time c. Available bit rate d. Unspecified bit rate e. Constant bit rate
E
(T/F) A VLAN network assigns computers to LAN segments by hardware.
F
(T/F) 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.
F
(T/F) A backbone network that connects many backbone networks spanning several buildings at a single location is often called an Internet backbone.
F
(T/F) A collapsed backbone uses a bus topology
F
(T/F) A hardware device that operates at the application layer is a router.
F
(T/F) A routed backbone tends to be used more for large networks than VLANs.
F
(T/F) A switched virtual circuit once defined is used for the current and future transmissions between two computers.
F
(T/F) ATM uses variable length cells.
F
(T/F) Backbone networks typically use lower speed circuits to interconnect a series of LANs and provide connections to other backbone networks.
F
(T/F) Gateways are simpler than routers.
F
(T/F) Layer-3 switches switch messages based on their data link layer address.
F
(T/F) One advantage of a routed backbone is that is requires little management.
F
(T/F) One of the least common uses of gateways is to enable LANs that use TCP/IP and Ethernet to communicate with mainframes that use other protocols.
F
(T/F) Routed backbones are switches that move packets based on data link layer addresses.
F
(T/F) Routers can only connect the same type of cable.
F
(T/F) Routers operate at the application layer
F
(T/F) The cable to connect BNs is usually twisted pair.
F
(T/F) The terms for hardware devices, such as routers and gateways, are interchangeable among vendors.
F
(T/F) With respect to high-speed networks, the acronym, ATM, refers to Automatic Teller Machines
F
(T/F) Switches, routers, and gateways devices that can connect networks to the BN.
T
(T/F) A backbone network is a high-speed network that connects many networks
T
(T/F) A key advantage of a chassis-based collapsed backbone is its flexibility.
T
(T/F) 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).
T
(T/F) ATM is a layer 3 technology that also includes layer 2 and layer 1 technologies as part of its specification
T
(T/F) ATM is connection oriented.
T
(T/F) Gateways connect two or more networks that use the same or different data link and the same or different network protocols.
T
(T/F) One advantage of a router is that it can choose the "best" route between networks when there is a choice.
T
(T/F) One basic component of a backbone network is the hardware device that connects other networks to the backbone.
T
(T/F) One difference between a switch and a bridge is that a router will only process messages addressed to the router, while a switch processes all messages..
T
(T/F) Routers connect two or more network segments that use the same or different data link protocols, but the same network protocol.
T
(T/F) Routers use network layer address to forward packets between network segments.
T
(T/F) 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.
T
(T/F) VLANs provide faster performance compared to switched, collapsed or routed backbone architectures.
T