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Practice Final_S4_phan 1

   Trong: CCNA
 
May 18 2008, 03:37 PM     Bởi: Guest_lehuy0305_*
1.
A network administrator is asked to design a system to allow simultaneous access to the Internet for 250 users. The ISP for this network can only supply five public IPs. What can be used to accomplish this task?
routable translation
dynamic translation
static translation
port address translation
2.


The LAN attached to the Ethernet interface of the Raleigh router shown in the graphic is addressed with private IP addresses. If one public IP is assigned to the company, which commands could be used in a configuration that allows all devices with private IPs in this network to access the Internet? (Choose two.)
ip nat inside source list 1 interface serial0 overload
ip nat outside source list 1 interface serial0 overload
ip nat inside serial0
ip nat inside source list 1 pool Raleigh overload
ip nat inside Raleigh overload
ip inside nat source list 1 interface serial0 Raleigh

3.


The command output shown in the graphic was taken from a Cisco 806 broadband router. Which kind of address translation is in effect on this router?
static
dynamic
overload
private
public
4.
Which of the following IP addresses are defined by RFC 1918 as private addresses? (Choose three.)
192.168.146.0/22
172.10.25.0/16
172.31.0.0/16
20.0.0.0/8
10.172.92.8/29
5.
Why was NAT created? (Choose two.)
to create firewalls on routers
to conserve IP addresses
to translate domain names into IP addresses
to map network addresses to the corresponding data link address
to hide internal addresses from external devices
6.
Which statements about DHCP are true? (Choose three.)
DHCP uses TCP.
DHCP uses UDP.
DHCP sends messages to the server on port 67.
DHCP sends messages to the server on port 68.
DHCP sends messages to the client on port 67.
DHCP sends messages to the client on port 68.
7.
Which command would be used to exclude the IP address 192.168.24.5 from the DHCP address pool on a router?
Router(dhcp-config)# ip dhcp excluded-address 192.168.24.5
Router# ip dhcp excluded-address 192.168.24.5
Router(config-excluded)# ip dhcp excluded-address 192.168.24.5
Router(config)# ip dhcp excluded-address 192.168.24.5
Router(config)# excluded-address 192.168.24.5
Router(dhcp-config)# excluded-address 192.168.24.5
8.
Which command would produce the output shown in the graphic?
show ip dhcp server statistics
show ip dhcp binding
debug ip dhcp server events
debug ip dhcp binding
9.
Which of the following terms describes a device that will put data on the local loop?
DLCI
CO
DCE
DTE
PRI
BRI
10.
Which of the following devices is used to establish the communications link between the customer equipment and the local loop for digital lines?
terminal adapter
modem
CSU/DSU
PBX switch
ISDN switch
Frame Relay Switch
11.
Which of the following are commonly used as Data Communications Equipment? (Choose two.)
modem
router
CSU/DSU
ISDN Switch
Frame Relay Switch
12.
Which of the following switching types will allow the communication devices in the provider's network to be shared and only allocated to an individual subscriber during data transfer?
circuit-switched
packet-switched
frame-switched
dedicated-switched lines
lease-switched
13.
A company needs a WAN connection that is capable of transferring voice, video, and data at a minimum data rate of 155 Mbps. Which WAN connection is the best choice?
X.25
DSL
ATM
ISDN BRI
ISDN PRI
14.
Which statement explains why basic DSL is an unpopular WAN connectivity choice for enterprise computer departments that support home users?
DSL offers insufficient bandwidth to home users.
DSL requires the installation of new cables, which is not always possible for home users.
DSL dialup connection time is too slow for business use.
DSL has limited geographical availability.
15.
When planning simple WAN connections for a small company, which feature of the three layer hierarchical model makes it a good choice for the WAN topology.
It provides for redundancy.
It allows for easy WAN expansion in case of company growth.
It is less expensive.
It provides faster connection time.
It provides less latency and jitter
16.
The WAN connection for a nationwide company with 250 offices must support constant connections to core layer services for file sharing, and occasional Internet access. Which combination of WAN technologies will meet these needs with minimum expense?
Frame Relay PVC for Internet access and ATM for file server access
Frame Relay PVC for Internet access and ISDN for file server access
ISDN for Internet access and X.25 for file server access
ISDN for Internet access and Frame Relay PVC for file server access
17.
Which command will provide for CHAP authentication if the hostname on a challenging router is tampa with a password of florida?
username tampa password florida
username tampa florida
hostname tampa password florida
hostname tampa florida
18.


How will data be transmitted from the router to the ISP if the router has the two links shown in the graphic?
Both links will transmit data at the same rate.
1544 bits can be transmitted simultaneously from the router over the T1 line.
Both links will transmit bits one by one.
The 56K link will transmit a maximum of 53 bits at the same time.
19.
Which of the following is a function of a DCE device?
determines the next-hop address for a packet
multiplexes signals from several sources
adapts information for use on a service provider's network
used to directly connect two DTEs to simulate a WAN network
20.


Which of the following describes the WAN devices and cabling shown in the graphic? (Choose two.)
A null-modem cable is used between RouterD and DeviceC for connectivity.
A DB-25 or DB-9 serial cable is connected to interface S0/0 of RouterA.
DeviceB and DeviceC are DCE devices.
The same encoding scheme must be used by DeviceB and DeviceC.
A synchronous serial connection exists between DeviceB and DeviceC.
21.
A technician is testing the functionality of a recently installed router. The technician is unable to ping the serial interface of a remote router. The technician executes the show interface serial0/0 command on the local router and sees the following line in the output:

Serial0/0 is up, line protocol is down

What are possible causes for this command output? (Choose three.)
remote CSU/DSU failure
serial cable missing
interface shutdown
keepalives not being sent
clocking signal missing
22.
Which of the following LCP options can be configured for PPP? (Choose three.)
CHAP
Stacker
IPCP
CDPCP
Multilink
23.
When PPP authentication is enabled, which of the following may be checked before establishing a PPP link between two devices? (Choose two.)
the enable password on the remote device
the ip host configuration on the remote device
the security server database for the username and password of the remote device
the hostname and enable password on the local device
the local database for the username and password of the remote device

 

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