Help you pass CCNA Exploration 4.0 (640 802)
CCNA Exploration v4 Accessing the WAN Exam Final Practice Grade 100 %
1 A company is looking for a WAN solution to connect its headquarters site with four remote sites.
What advantage would dedicated leased lines provide to the customer compared to a shared
Frame Relay solution?
lower latency and jitter
variable bandwidth capacity
fewer physical router interfaces
Refer to the exhibit. The network administrator is adding R1 to an existing network. As a part
of the corporate IT procedures, the administrator attempts to back up the router Cisco IOS
software of R1 and receives the output shown. The network administrator then attempts
unsuccessfully to ping the TFTP server from the console session. What should be done next to
isolate this problem?
From R2, validate that interface Fa0/0 is operational.
From the TFTP server, verify that the software on the TFTP server is operational.
From the TFTP server, confirm there is enough room on the TFTP server for the Cisco IOS
From the console session, make sure that R1 has a route to the network where the TFTP
3 Which device encodes data for transmission across the WAN service provider transmission link?
4Refer to the exhibit. An administrator has added the exhibited commands to routers A and B,
but no routing updates are exchanged between the two routers. Based on the information that is
given, what is the likely cause of the problem?
Router A is advertising the wrong network.
The authentication key strings do not match.
The serial interfaces of routers A and B are not on the same network.
The authentication key numbers do not match the EIGRP process number for both routers.
5 What are two characteristics of DSL technology? (Choose two.)
Uploads typically offer larger transfer rates than downloads.
Service providers deploy DSL in the local loop of the telephone network.
DSL download rates are reduced by large volumes of POTS voice traffic.
Filters and splitters allow POTS and DSL traffic to share the same medium.
DSL is a shared medium that allows many users to share bandwidth available from the DSLAM.
6 An administrator is unable to receive e-mail. While troubleshooting the problem, the
administrator is able to ping the local mail server IP address successfully from a remote
network and can successfully resolve the mail server name to an IP address via the use of the
nslookup command. At what layer of the OSI model is the problem most likely to be found?
7 While troubleshooting a problem with an e-mail server, an administrator observes that the
switch port used by the server shows “up, line protocol up”. The administrator cannot ping the
server. At which layer of the OSI model is the problem most likely to be found?application layer
data link layer
Refer to the exhibit. An ACL called Managers already exists on this router. What happens if the
network administrator issues the commands as shown in the exhibit?
The new ACL overwrites the existing ACL.
The network administrator will receive an error message.
The existing ACL is modified to include the new command.
A second Managers ACL is created that contains only the new command.
Refer to the exhibit. Why are the routers unable to establish a PPP session?
The usernames are misconfigured.
The IP addresses are on different subnets.
The clock rate is configured on the wrong end of the link.
The CHAP passwords must be different on the two routers.
Interface serial 0/0/0 on Router1 must connect to interface serial 0/0/1 on Router2.
10 A technician is talking to a colleague at a rival company and comparing DSL transfer rates
between the two companies. Both companies are in the same city, use the same service provider,
and have the same rate/service plan. What is the explanation for why Company A reports
higher download speeds than Company B?
Company B has a higher volume of POTS voice traffic than Company A.
Company B shares the conection to the DSLAM with more clients than Company A.
Company A only uses microfilters on branch locations.
Company A is closer to the service provider.
11Refer to the exhibit. R1 is performing NAT overload for the 10.1.1.0/24 inside network. HostA
has sent a packet to Web Server. What is the destination IP address of the return packet from
Web Server when it is received at the NIC on HostA?
12 Which protocol is implicitly denied at the end of an IPv4 access list?
13 A network administrator is analyzing the data from a network performance baseline. Which
condition will not be indicated in the baseline data?
the IP addressing scheme of the network
the most heavily used parts of the network
congested areas of the network
error rates in different parts of the network
Refer to the exhibit. An administrator is trying to connect Router1, a Cisco router, to a
non-Cisco router using a serial connection. Why is the connection failing?
A loopback is not set.
The interface has been shut down.The wrong encapsulation is being used.
Queuing cannot be used when connecting to non-Cisco devices.
Refer to the exhibit. Which statement is true about the WAN switch device?
It uses a multiport internetworking device to switch traffic such as Frame Relay, ATM or
X.25 over the WAN.
It provides internetworking and WAN access interface ports that are used to connect to the service
It provides termination for the digital signal and ensures connection integrity through error
correction and line monitoring.
It converts the digital signals produced by a computer into voice frequencies that can be
transmitted over the analog lines of the public telephone network.
Refer to the exhibit. Which statement is true about the status of the Frame Relay connection?
The Frame Relay connection is in the process of negotiation.
Only packets with control bit DE set are sent over the PVC. No data traffic traverses the link.
Packets marked as FECN and BECN indicate that a congestion control mechanism is enabled
on the Frame Relay PVC.
The “DLCI USAGE = LOCAL” status indicates that the PVC link is not established between the
interface S0/0/0.1 and the Frame Relay switch.17
Refer to the exhibit. The hosts in network A all have static addresses that are assigned in the
192.168.2.0./24 network. The hosts in network B are DHCP clients in the 192.168.1.0/24
network. After router R1 has been configured with the statements as shown in the exhibit, the
DHCP clients are reporting that they cannot access any network resources. The hosts with static
addresses cannot access any resources outside network A. What is the problem?
The DHCP scope has the wrong address pool.
The interfaces on R1 are incorrectly addressed.
The assignable DCHP addresses are all excluded.
The DCHP clients are receiving the wrong default router address.
Refer to the exhibit. Router1 and Router2 each support separate areas of a data center, and are
connected via a crossover cable. Resources attached to Router1 are unable to connect to
resources attached to Router2. What is the likely cause?The crossover cable is faulty.
The IP addressing is incorrect.
There is a Layer 2 problem with the router connection.
The upper layers are experiencing an unspecified problem.
One or both of the Ethernet interfaces are not working correctly.
19 At what physical location does the responsibility for a WAN connection change from the service
provider to the user?
20 Because of a remote-procedure call failure, a user is unable to access an NFS server. At what
layer of the TCP/IP model does this problem occur?
data link layer
21 Which two functions are provided by the Local Management Interface (LMI) that is used in
Frame Relay networks? (Choose two.)
the mapping of DLCIs to network addresses
the sending of keepalive packets to verify operation of the PVC
Refer to the exhibit. A packet is being sent from Host A to Host B through the VPN tunnel
between R1 and R3. When the packet first arrives at R3, what are the source and destination IP
addresses of the packet?
Source 192.168.1.2 – Destination 192.168.4.2
Source 192.168.3.1 – Destination 192.168.3.2
Source 192.168.2.1 – Destination 192.168.3.2
Source 192.168.3.1 – Destination 192.168.4.2
23 Which protocol is used to authenticate connections over serial links securely?
24Refer to the exhibit. Branch A has a Cisco router and Branch B has a non-Cisco router that is
using IETF encapsulation . After the commands that are shown are entered, R2 and R3 fail to
establish the PVC. The R2 LMI is Cisco, and the R3 LMI is ANSI. The LMI is successfully
established at both locations. Why is the PVC failing?
The PVC to R3 must be point-to-point.
LMI types cannot be different on each end of a PVC.
A single port can only support one encapsulation type.
The IETF parameter is missing from the frame-relay map ip 192.168.1.3 203 command.
Refer to the exhibit. A network administrator is trying to configure a router to use SDM, but
the network administrator cannot access the SDM interface of the router. What is the cause of
The VTY lines are misconfigured.
The HTTP timeout policy is misconfigured.
The authentication method is misconfigured.
The username and password are misconfigured.26
Refer to the exhibit. The SSH connections between the remote user and the server are failing.
The correct configuration of NAT has been verified. What is the most likely cause of the
SSH is unable to pass through NAT.
There are incorrect access control list entries.
The access list has the incorrect port number for SSH.
The ip helper command is required on S0/0/0 to allow inbound connections.
27 What effect would the Router1(config-ext-nacl)# permit tcp 172.16.4.0 0.0.0.255 any eq www
command have when implemented inbound on the f0/0 interface?
All TCP traffic is permitted, and all other traffic is denied.
The command is rejected by the router because it is incomplete.
All traffic from 172.16.4.0/24 is permitted anywhere on any port.
Traffic originating from 172.16.4.0/24 is permitted to all TCP port 80 destinations.
28 While configuring a Frame Relay connection, when should a static Frame Relay map be used?
the remote router is a non-Cisco router
the local router is configured with subinterfaces
broadcast traffic and multicast traffic over the PVC must be controlled
globally significant rather than locally significant DLCIs are being used
29 Where will a router operating system image be copied after the copy flash: tftp command is
30Refer to the exhibit. You are a network administrator who has been tasked with completing the
Frame Relay topology that interconnects two remote sites. How should the point-to-point
subinterfaces be configured on HQ to complete the topology?
HQ(config-subif)#frame-relay interface-dlci 103 on Serial 0/0/0.1
HQ(config-subif)#frame-relay interface-dlci 203 on Serial 0/0/0.2
HQ(config-subif)#frame-relay interface-dlci 301 on Serial 0/0/0.1
HQ(config-subif)# frame-relay interface-dlci 302 on Serial 0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 103 broadcast on Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 203 broadcast on Serial 0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 301 broadcast on Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 302 broadcast on Serial 0/0/0.2
Refer to the exhibit. A host connected to Fa0/0 is unable to acquire an IP address from the
DHCP server. The output of the debug ip dhcp server command shows “DHCPD: there is no
address pool for 10.1.1.1″. What is the problem?
The 10.1.1.1 address is already configured on Fa0/0.
The default router for the 10Network pool is incorrect.
The ip helper-address must be added to Fa0/0 interface.The pool of addresses for the 10Network pool is incorrect.
Refer to the exhibit. Router1 is not able to communicate with its peer that is connected to this
interface. Based on the output as shown, what is the most likely cause?
improper LMI type
local cable unplugged
33 What will be the result of adding the command ip dhcp excluded-address 172.16.4.1 172.16.4.5
to the configuration of a local router that has been configured as a DHCP server?
Traffic that is destined for 172.16.4.1 and 172.16.4.5 will be dropped by the router.
Traffic will not be routed from clients with addresses between 172.16.4.1 and 172.16.4.5.
The DHCP server function of the router will not issue the addresses between 172.16.4.1 and
The router will ignore all traffic that comes from the DHCP servers with addresses 172.16.4.1 and
34Refer to the exhibit. Which DHCP requests will R1 answer?
all DHCP requests that R1 receives
requests that are broadcast to 10.0.1.255
DNS requests with a destination of 10.0.1.3
requests that are received on the FastEthernet 0/0 interface
requests that come from any networks that are not listed as excluded
35 A router in a Frame Relay network needs to forward a message received from a host. What two
methods does the router use to identify the correct VC to forward the message? (Choose two.)
The router forwards the frame to all ports in the network and learns the address from the reply
The destination host IP address is embedded in the DLCI.
The router searches Inverse ARP tables for maps of DLCIs to IP addresses.
A table of static mappings can be searched.
The router broadcasts a request for the required IP address.
36 An administrator is configuring a dual stack router with IPv6 and IPv4 using RIPng. The
administrator receives an error message when trying to enter the IPv4 routes into RIPng. What
is the cause of the problem?
RIPng is incompatible with dual-stack technology.
All interfaces have been configured with the incorrect IPv4 addresses.
RIPv1 or RIPv2 needs to be configured in addition to RIPng to successfully use IPv4.
When IPv4 and IPv6 are configured on the same interface, all IPv4 addresses are shut down in
favor of the newer technology.
37 What are the symptoms when the s0/0/0 interface on a router is attached to an operational
CSU/DSU that is generating a clock signal, but the far end router on the point-to-point link has
not been activated?
show controllers indicates cable type DCE V.35. show interfaces s0/0/0 indicates serial down,
line protocol down.
show controllers indicates cable type DCE V.35. show interfaces s0/0/0 indicates serial up, line
show controllers indicates cable type DTE V.35. show interfaces s0/0/0 indicates serial up,
line protocol down.
show controllers indicates cable type DTE V.35. show interfaces s0/0/0 indicates serial down,
line protocol down.38 What three statements describe the roles of devices in a WAN? (Choose three.)
A CSU/DSU terminates a digital local loop.
A modem terminates a digital local loop.
A CSU/DSU terminates an analog local loop.
A modem terminates an analog local loop.
A router is commonly considered a DTE device.
A router is commonly considered a DCE device.
Refer to the exhibit. Routers R1 and R2 are both configured for single area OSPF. Users who are
connected to switch S1 are unable to access database applications that run on servers that are
connected to S2. The network engineer is working remotely and only has the information that is
shown in the exhibit to direct initial troubleshooting efforts. Based on the exhibit, which OSI
layer is the most appropriate to start with for a divide-and-conquer approach?
40Refer to the exhibit. Partial results of the show access-list and show ip interface fastethernet 0/1
commands for router R3 are shown. There are no other ACLs in effect. Host A is unable to telnet to
host B. Which action will correct the problem but still restrict other traffic between the two
Modify the second entry in the list to permit tcp host 192.168.10.10 any eq telnet .
Reverse the order of the TCP protocol statements in the ACL.
Apply the ACL on the FastEthernet 0/0 interface.
Apply the ACL in the inbound direction.
Refer to the exhibit. What is placed in the address field in the header of a frame that will travel
from the DC office of ABC Company to the Orlando office?
MAC address of the Orlando router
MAC address of the DC router
42 When configuring remote access to a router, what is the significance of the no password
command on a VTY line?
Logins are prevented on that line.
No password is required to log in to that line.
The remote user is not allowed to change the password for that line.
The remote user is prompted to change the line password after connecting to the router.43
Refer to the exhibit. The network administrator creates a standard access control list on
Router1 to prohibit traffic from the 172.16.1.0/24 network from reaching the 172.16.2.0/24
network while still permitting Internet access for all networks. On which router interface and
in which direction should it be applied?
interface Fa0/0, inbound
interface Fa0/0, outbound
interface Fa0/1, inbound
interface Fa0/1, outbound
44Refer to the exhibit. Routers R1 and R2 have been configured with EIGRP in the same
autonomous system. Computers PC1 and PC2 are not able to ping each other. Further
investigation has revealed that the route to 192.168.10.0 is missing from the routing table on R2.
What is the cause of the problem?
The networks are not correctly summarized.
The FastEthernet interfaces on R1 are configured as passive.
The network statements on R2 are incorrectly configured.
EIGRP on R1 does not recognize the 192.168.10.0 network.
45 Which three statements accurately describe attributes of a security policy? (Choose three.)
It creates a basis for legal action if necessary.
It should not be altered once it is implemented.
It defines a process for managing security violations.
It focuses primarily on threats from outside of the organization.
It defines acceptable and unacceptable use of network resources.
It provides step-by-step procedures to harden routers and other network devices.
46 What is a major characteristic of a worm?
malicious software that copies itself into other executable programs
tricks users into running the infected software
a set of computer instructions that lies dormant until triggered by a specific event
exploits vulnerabilities with the intent of propagating itself across a network
47Refer to the exhibit. Which two statements correctly describe how Router1 processes an FTP
request that enters interface S0/0/0 and is destined for an FTP server at IP address 192.168.1.5?
The packet does not match an access list condition.
The router matches the incoming packet to the statement that is created from the access-list 201
permit ip any any command.
The router matches the incoming packet to the statement that is created from the access-list
101 permit ip any 192.168.1.0 0.0.0.255 command.
The router matches the incoming packet to the statement that is created from the access-list 201
deny icmp 192.168.1.0 0.0.0.255 any command.
The packet is allowed into Router1.
48 A technician has been asked to run the Cisco SDM one-step lockdown on the router of a
customer. What will be the result of this process?
The router will download the latest security patches from the specified FTP server.
All security configurations that are offered by the Cisco AutoSecure feature will be automatically
All traffic that enters the router is quarantined and checked against the possible security problems
before being forwarded.
The existing router configurations will be examined and all potential security-related
configuration changes will be automatically implemented.
49 Which statement is true about wildcard masks?
Inverting the subnet mask will always create the wildcard mask.
A wildcard mask identifies a network or subnet bit by using a “1″.
The same function is performed by both a wildcard mask and a subnet mask.
When a “0″ is encountered in a wildcard mask, the IP address bit must be checked.
50 What type of ACL can be used to force a user to authenticate to the router before accessing a
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