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Voucher Exam - CCNA（折扣号考试）---上2007-09-30 10:59:00

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

Time Remaining:

1
How is the number 225 represented in binary?
11001111
11011011
11110011
11100001

2
What transmission channels are provided by an ISDN BRI service?
23 64 kbps B channels and one 64 kbps D channel
30 64 kbps B channels and one 16 kbps D channel
two 56 kbps B channels and one 16 kbps D channel
two 64 kbps B channels and one 16 kbps D channel
two 64 kbps D channels and one 16 kbps B channel
23 64 kbps D channels and one 64 kbps B channel

3
Which of the following is true regarding latency?
CSMA/CD requires no latency.
It is also called asymmetry.
It is based entirely on distance.
Networking devices add to latency.

4
What is the length, in bits, of an Ethernet address?
12
24
32
48
80
128

5


The switches in the graphic are configured for VTP as shown. Select the statements that correctly describe the operation of these switches. (Choose two.)
A new VLAN can be added to Switch1 and that information will be added only to Switch2.
An existing VLAN can be deleted from Switch2 and that VLAN will be deleted from Switch1 and Switch4.
A new VLAN can be added to Switch4 and that information will be added to Switch1, Switch2, and Switch3.
A new VLAN can be added to Switch1 and that information will be added to Switch2 and Switch4.
A new VLAN can be added to Switch3 and that information will be added to Switch1, Switch2, and Switch4.
An existing VLAN can be deleted from Switch4 and that VLAN will be deleted from Switch1 and Switch2.

6
Which layer is responsible for organizing bits using framing?
Layer 1
Layer 2
Layer 3
Layer 4

7
What is the purpose of DLCIs in Frame Relay?
They determine the Frame Relay encapsulation type.
They identify the logical circuit between a local router and a Frame Relay WAN switch.
They represent the keepalives used to maintain the PVC in an active state.
They represent the physical address of the router attached to a Frame Relay network.

8
For which condition will the ARP protocol be used?
The destination IP address is unknown.
The destination MAC address is unknown.
The source IP address is unknown.
The source MAC address is unknown.

9


If the above network has been configured with RIPv2, how many usable host addresses are in the 192.168.10.192 subnet?
0
2
4
6
8

10
Which three of the following are uses of access control lists (ACLs)? (Choose three.)
protect hosts from viruses
classify network traffic
provide high network availability
identify interesting traffic for DDR
IP route filtering
monitor the number of bytes and packets

11
Which device allows data communication to occur between VLANs?
bridge
hub
switch
router

12
Which of the following EIGRP functions is the responsibility of the IP protocol-dependent module (PDM)? (Choose three.)
the calculation of successor and feasible successor routes for IP and IPX traffic
the notification of DUAL when IP routing information is received
the communication of information about IP routes with neighbor routers
the maintenance of the IP routing table
the exchange of hello packets with other IP-enabled routers
the insertion of lowest cost paths into the routing table

13
Which protocol is paired with its routing classification?
BGP-Interior
EIGRP-Exterior
OSPF-Exterior
RIP-Interior

14


Refer to the graphic. Which of the following are true regarding the route summary EIGRP would utilize for the networks on RouterA? (Choose two.)
The networks can be summarized with auto-summary.
The network summary must be manually configured.
The default subnet mask can be used to summarize the networks.
The networks can be summarized with 172.16.64.0/26.
The networks can be summarized with 172.16.64.0/27.
The networks can be summarized with 172.16.64.0/28.

15
Company XYZ has a Class B address of 135.166.0.0 and currently has 4 individual segments to subnet. The company will be adding 7 additional segments over this year and 9 additional segments the following year. What subnet mask should be used on the network in order to support the largest number of hosts per subnet?
255.255.224.0
255.255.240.0
255.255.248.0
255.255.250.0
255.255.252.0
16
Which of the following represents a group of routers under a common administration and is required when configuring routing protocols such as EIGRP?
control group
autonomous system
corporate system
Domain Name System
local-area network
wide-area network

17
What are the effects of LAN segmentation using a switch? (Choose three.)
dedicated bandwidth between source and destinations
enlarged collision domains
decreased broadcast domains
increased number of collision domains
increased latency in the network

18
Which utility can be used to verify connectivity through all seven layers of the OSI model?
netstat
ping
Telnet
traceroute

19
Which of the following messages are sent from a DHCP server to a client during a successful configuration process? (Choose two.)
DHCPDISCOVER
DHCPOFFER
DHCPREQUEST
DHCPACK

20


The Cake router shown in the graphic has multiple RIP version 2 paths to the network attached to E0 of the Pie router. Which interface on the Cake router will be used to forward a packet from the 192.168.5.0 network to the 192.168.13.0 network?
E0
E1
S0
S1
It will load balance across S0 and S1.
It will load balance across S0, S1 and E1.

21
What is true about windowing?
It always requires separate acknowledgements for each segment sent.
It controls the amount of data that can be sent before acknowledgement is required.
It requires the sender to re-establish a connection if no acknowledgement is received.
It allows TCP/IP to measure transmitted data in segments.

22
Which functions are carried out by switches and bridges when building the CAM tables? (Choose three.)
builds the table using unknown source MAC addresses from received frames
builds the table using unknown destination MAC addresses from received frames
time stamps the entries for each address
time stamps the BPDU of each frame received
maps switch port numbers with the associated MAC address
maps switch port numbers with the associated network address

23
Which of the following is the ISDN Layer 2 signaling protocol?
BRI
PRI
LAPA
LAPD

24
Which of the following IP addresses are broadcast addresses if the subnet mask is 255.255.255.240? (Choose three.)
75.32.75.15
205.16.35.11
199.254.129.111
129.130.17.143
135.22.55.93
105.33.62.213

25
What is the function of the first phase of PPP negotiation?
link termination
authentication of communicating peers
link establishment and configuration
network layer protocol configuration

26
Which method does a router use to build a Frame Relay map?
ARP requests
RARP requests
Inverse RARP requests
Inverse ARP requests

27
Which methods do frame relay switches use to inform DTEs of congestion within the frame relay network?
CCP and LMI
CIR and LATE
DLCI and SPID
FECN and BECN

28
Given a router that has already been configured, what is the correct loading sequence when powering on?
bootstrap, RAM, operating system
bootstrap, configuration file, operating system
bootstrap, operating system, configuration file
operating system, configuration file, RAM

29
What is the purpose of the show cdp neighbors command?
to display a summary of the configurations of all directly attached Cisco devices
to display information about all Cisco devices that are directly connected to a local device
to display information about all Cisco networks in the WAN
to display addressing information about all remote routers
to display the names of all OSPF neighbors in the local area

30
Which component designates a device that is not compatible with ISDN and requires a terminal adapter?
NT1
NT2
TE1
TE2

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