Wednesday, June 19, 2013

Both switches and hubs are being utilized within the TestKing network.
Which of the following is true regarding the use of switches and hubs for
network connectivity in this network?
A. Switches take less time to process frames than hubs take
B. Hubs can filter frames
C. Switches do not forward broadcasts
D. Switches increase the number of collision domains in the network
E. Using hubs can increase the amount of bandwidth available to hosts
F. None of the above
Answer: D
Which one of the following characteristics is true regarding the use of hubs
and switches?
A. Hubs can have their ports be configured with VLANs
B. Using hubs is costly with regard to bandwidth availability.
C. Switches can not forward broadcasts.
D. Switches are more efficient than hubs in processing frames.
E. Switches increase the number of collision domains in the network.
Answer: E
Switches increases the number of collisions domains in the network. Switches that are
configured with VLANs will reduce the size of the collision domains by increasing the
number of collision domains in a network, but making them smaller than that of one big,
flat network.
Incorrect Answers:
A. Switches are capable of VLAN configurations, but hubs are not.
B. Hubs are generally the least costly method possible to connect multiple devices together in a
C. Switches forward broadcasts and multicasts, by default, to all ports within the same VLAN.
Only routers block all broadcast traffic by default.
D. Switches and hubs can be equally efficient in processing frames, in theory. In practice,
switches are generally more efficient as they usually have more CPU and memory allocated to
them, and are generally much more expensive than a simple hub.
When comparing and contrasting the similarities and differences between
bridges and switches, which of the following are valid statements? Choose
all the valid answer choices)
A. Bridges are faster than switches because they have fewer ports.
B. A switch is a multiport bridge,
C. Bridges and switches learn MAC addresses by examining the source MAC
address of each frame received.
D. A bridge will forward a broadcast but a switch will not.
E. Bridges and switches increase the size of a collision domain.
F. None of the above statements are true.
Answer: B, C
Both bridges and switches build the bridge table by listening to incoming frames and examining
the source MAC address in the frame.
Switches are multiport bridges that allow you to create multiple broadcast domains. Each
broadcast domain is like a distinct virtual bridge within a switch.
Incorrect Answers:
A. Switches are generally faster than bridges. Bridges also do not necessarily have fewer ports
than switches.
D. Both bridges and switches will forward broadcast and multicast traffic, assuming that the traffic
remains in the same VLAN.
Which of the following correctly describe the various functions and virtues
of a router? (Select all valid answer choices)
A. Packet switching
B. Collision prevention on a LAN segment.
C. Packet filtering
D. Broadcast domain enlargement
E. Broadcast forwarding
F. Internetwork communication
G. None of the above
Answer: A, C, F
The main function of a router is to connect different, separated networks together. In doing so,
switching packets from one network to another is a primary function, along with providing for
communication between networks. As an additional feature, routers are capable of providing
filtering on a network address and application port level, so choice C is also correct.
Incorrect Answers:
B. Routers can indeed be used to segment a network separate a collision domain, since routers
do not forward LAN broadcasts and multicasts to other interfaces. However, routers alone can not
prevent all collisions from occurring on any given LAN segment.
D. Routers actually segment LANs into smaller broadcast domains.
E. Routers do not forward broadcast and multicast traffic out the additional interfaces by default.
Unless bridging or IP helpers are configured on the router, LAN broadcasts are blocked at the
router level.
The LAN needs are expanding at the Testking corporate office, which is
quickly growing. You are instructed to enlarge the area covered by a single
LAN segment on the TestKing network. Which of the following are layer 1
devices that you can use? (Choose all that apply.)
A. A switch
B. A router
C. A network adapter card
D. A hub
E. A repeater
Answer: D, E
A hub simply repeats the electrical signal and makes no attempt to interpret the electrical signal
(layer 1) as a LAN frame (Layer 2). So, a hub actually performs OSI layer 1 functions, repeating
an electrical signal, whereas a switch performs OSI layer 2 functions, actually interpreting
Ethernet header information, particularly addresses, to make forwarding decisions. Hubs can be
used to increase the number of stations that can be supported on a LAN.
Because the repeater does not interpret what the bits mean, but does examine and generate
electrical signals, a repeater is considered to operate at Layer 1. Repeaters can be used to
physically extend the LAN to greater distances.
Both bridges are switches are being used throughout the TestKing LAN.
Which of the following statements are true regarding bridges and switches
in this network?
(Choose 3)
A. Switches are primarily software based while bridges are hardware based.
B. Switches usually have a higher number of ports than most bridges.
C. Bridges are frequently faster than switches.
D. Bridges define broadcast domains while switches define collision domains.
E. Both bridges and switches forward Layer 2 broadcasts.
F. Both bridges and switches make forwarding decisions based on Layer 2
Answer: B, E, F

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