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Voucher Exam - CCNA（折扣号考试）---下2007-09-30 11:01:00

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Take Assessment - Voucher Exam - CCNA 4 WAN Technologies (Version 3.1)

Time Remaining:

31
Which networking device performs path determination?
a hub
a switch
a router
a bridge

32
Which list contains only routed protocols?
AppleTalk, IP, EIGRP
IP, AppleTalk, IPX
IP, RIP, IPX
IPX, OSPF, EIGRP

33
Which statement is true regarding routing metrics?
All routing protocols use the same metrics.
EIGRP uses bandwidth as its only metric.
Routers compare metrics to determine the best route.
The larger metric generally represents the better path.

34
Which statement describes the store and forward transmission mode of an Ethernet switch?
It is also referred to as a hybrid mode or as error sensing mode.
It requires the switch to read the first 64 bytes of an Ethernet frame and then begins to forward the data.
It decreases the latency of the transmission but has very little error detection.
It increases latency with large frames, but error detection is high.

35
Which statements about VLANs are true? (Choose three.)
VLANs are restricted to a physical segment.
They are logical groupings of devices.
User hosts can be grouped by function.
VLANs are configured by software.
VLANs are standardized.

36
Which statement is correct concerning routing and routed protocols?
A routed protocol allows the routers to communicate with other routers and maintain tables for a routing protocol.
A routing protocol allows routers to communicate with other routers and maintain tables for a routed protocol.
Routers only need to use routing protocols to work properly.
There is no difference between routed and routing protocols.

37
Which command will display statistics for all interfaces configured on a router?
list interfaces
show interfaces
show processes
show statistics

38
Which type of handshaking occurs when using CHAP?
one-way
two-way
three-way
four-way

39
Which statements describe the use of Link State Advertisements (LSA)? (Choose two.)
LSAs are generated when changes in the network occur.
Link state advertisements are refreshed every 60 minutes.
The router copies the information received from each LSA packet into the routing table.
Routers exchange LSAs to build and maintain topology databases.
Forwarding LSAs can increase the occurrence of routing loops.

40
Which of the following are benefits of creating a subnetwork structure in an IP network? (Choose three.)
permits network address duplication
allows for address flexibility
prevents address replication
provides broadcast containment
adds low-level security
allows for more network hosts available

41
What determines how much data a sending station running TCP/IP can transmit before it must receive an acknowledgment?
segment size
transmission rate
bandwidth
window size
sequence number

42
An administrator has an older 1900 switch located on the edge of the network. What can the network administrator do to ensure that it does not become the root bridge of the spanning-tree network?
decrease the BPDU hello timer update on the 1900
assign the highest IP address to the switch that should be the root
assign the lowest IP address to new root bridge
assign the lowest priority to the switch that should be the root
assign the highest priority to the new root bridge
decrease the BID on the 1900 switch

43
What is the purpose of typing o/r 0x2142 during a password recovery procedure on a 2500 series router?
to restart the router
to bypass the configuration in NVRAM
to view the lost password
to save the changes to the configuration
to enter ROM Monitor mode

44
Which of the following are true concerning distance vector and link state routing protocols? (Choose 2.)
Distance vector protocols send the entire routing table to directly connected neighbors.
Link state protocols send the entire routing table to all routers in the network.
Distance vector protocols send updates about directly connected neighbors to all networks listed in the routing table.
Link state protocols send updates containing the state of their own links to all other routers on the network.

45
What does the ISDN BRI provide?
23 B channels and one 64 kbps D channel
total bit rate up to 1.536 Mbps
two 56 kbps B channels and one 64 kbps D channel
two 64 kbps B channels and one 16 kbps D channel
46


In an effort to minimize traffic, an administrator decided to keep web traffic from causing the ISDN link to come up by denying WWW traffic to the 192.168.20.5 remote server. Two minutes after making changes to the configuration as shown in the graphic, the administrator notices that web traffic is still passing over the link. What is the most likely cause of the problem?
The dialer-group has not been applied to outbound traffic.
The access-list is incorrectly configured.
Broadcasts are creating "interesting" traffic and keeping the link active.
The command ip access-group 128 out is missing from the bri0/0 interface.

47
Which address does a bridge use to build its bridging table?
destination IP address
destination MAC address
source IP address
source MAC address

48
What is the default ISDN encapsulation used on Cisco ISDN routers?
SLIP
PPP
HDLC
VPP

49
What is the purpose of the IOS enable secret command?
to set password protection on incoming Telnet sessions
to set password protection on the console terminal
to allow a user access to User mode
to allow a user to enter a password that will be encrypted

50
Which of the following improves security in PPP authentication?
LCP
NCP
CHAP
PAP

51
How many bits are in IPv6 addresses?
16
32
64
96
128
258

52
What is the term for the cabling that connects the customer premises equipment to the CO switch?
demarc
local loop
final mile
DTE
trunk line

53
What enables routers to learn of destination networks?
proxy ARP
CAM table exchanges
host name tables
routing protocols
DNS lookups

54
Which reason is correct for having at least one true condition in an ACL?
If there is not a true statement, all packets are returned to the sender.
The implicit "deny any" statement will deny all traffic.
True conditions only test the status of the router.
You are not required to have a true statement in ACL.

55
What is the name of that point in a LAN where the responsibility of the network administrator ends and the responsibility of the telco begins?
point of presence
local loop
DTE
demarcation

56
Which of the following are functions of a WAN? (Choose three.)
permit real-time communication between users
allow users access to high bandwidth
provide full-time local service
provide e-mail and e-commerce services
connect physically adjacent devices
provide access to computers in other locations

57


All the routers in the network shown in the graphic are part of the same OSPF area. All the routers were powered up simultaneously, except Router E, which was brought online the following day. Which router will be the BDR after the network has converged?
Router A
Router B
Router C
Router D
Router E

58
Which type of ACL only checks the source address?
Extended ACL
General ACL
Source ACL
Standard ACL

59
When using distance-vector routing protocols in a frame relay environment with multiple DLCIs on a single physical router interface, split-horizon issues must be resolved. According to Cisco best practices, what should be configured to manage these issues?
a single network address
multiple LMIs
subinterfaces
multiple IP addresses on the same subnet

60
Which fields are common to the TCP and the UDP segments? (Choose two.)
source address
sequence number
acknowledgement number
options
checksum
destination port
61
Which of the following do switches send at regular intervals to eliminate switching loops?
bi-directional protocol data units
binary protocol data units
bridge protocol data units
buffered protocol data units

62
What reduces the problems of routing loops due to incorrect updates?
count to infinity
distance vector timers
event-triggered updates
split horizon

63
Routers and switches both perform important tasks in an internetwork. Which of the following are distinguishing differences between them? (Choose two.)
Routers are used more often in LAN topologies than switches.
Routers do not require an initial configuration to operate but switches do.
Routers and switches operate at different layers of the OSI model.
Routers and switches route different sets of protocols.
Routers block broadcasts but switches forward broadcasts.

64
When must data be sent by way of the default route?
The destination network is on a different network than the source.
The destination network is not directly connected to the router.
The destination network is a stub network.
There is no entry in the routing table for the destination network.

65
What is an advantage of the use of layers in the OSI reference model?
It breaks network communications into larger parts.
It increases complexity.
It prevents changes in one layer from affecting other layers.
It requires the use of single-vendor equipment for hardware and software communications.

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