CCNA 4 A1

CCNA 4 A1

the network? Cisco Security Agent antivirus software scannerRefer to the exhibit. A network administrator has issued the commands that are shown on Router1 and Router2. A later review of the routing tables reveals that neither router is learning the LAN network of the neighbor router. What is most likely the problem with the

published on May 18, 201382 responses 0

1. What are two main components of data confidentiality? (Choose two.)

Select the two correct answers
checksum
digital certificates
encapsulation
encryption
hashing

2. Which network component has the primary function of detecting and logging attacks made against the network?

Cisco Security Agent
antivirus software scanner
intrusion detection system
intrusion prevention system

3. Refer to the exhibit. A network administrator has issued the commands that are shown on Router1 and Router2. A later review of the routing tables reveals that neither router is learning the LAN network of the neighbor router. What is most likely the problem with the RIPng configuration?

The serial interfaces are in different subnets.
The RIPng process is not enabled on interfaces.
The RIPng network command is not configured.
The RIPng processes do not match between Router1 and Router2.

4. Which three guidelines would help contribute to creating a strong password policy? (Choose three.)

Select the three correct answers
Once a good password is created, do not change it.
Deliberately misspell words when creating passwords.
Create passwords that are at least 8 characters in length.
Use combinations of upper case, lower case, and special characters.
Write passwords in locations that can be easily retrieved to avoid being
locked out.
Use long words found in the dictionary to make passwords that are
easy to remember.

5. Refer to the exhibit. The link between the CTRL and BR_1 routers is configured as shown in the exhibit. Why are the routers unable to establish a PPP session?

The clock rate must be 56000.
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 CTRL must connect to interface serial 0/0/1
on BR_1.

6. Refer to the exhibit. Headquarters is connected through the Internet to branch office A and branch office B. Which WAN technology would be best suited to provide secure connectivity between headquarters and both branch offices?

ATM
VPN
ISDN
Frame Relay
broadband DSL

7. Which combination of authentication and Layer 2 protocol should be used to establish a link between a Cisco and a non-Cisco router without sending authentication information in plain text?

CHAP and HDLC
CHAP and PPP
PAP and HDLC
PAP and PPP

8. 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 1 reports higher download speeds than company 2 reports?

Company 2 downloads larger files than company 1 downloads.
Company 2 must share the connection to the DSLAM with more clients
than company 1 shares.
Company 1 is closer to the service provider than is company 2.
Company 1 has a lower volume of POTS traffic than company 2 has.

9. Refer to the exhibit. The network administrator creates a standard access control list to prohibit traffic from the 192.168.1.0/24 network from reaching the Internet. The access list must still permit the 192.168.1.0/24 network access to the 192.168.2.0 network. On which router interface and in which direction should the access control list be applied?

interface Fa0/0, inbound
interface Fa0/0, outbound
interface S0/0/0, inbound
interface S0/0/0, outbound

10. 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?

When IPv4 and IPv6 are configured on the same interface, all IPv4
addresses are over-written in favor of the newer technology.
Incorrect IPv4 addresses are entered on the router interfaces.
RIPng is incompatible with dual-stack technology.
IPv4 is incompatible with RIPng.

11. Refer to the exhibit. A network administrator is trying to backup the IOS software on R1 to the TFTP server. He receives the error message that is shown in the exhibit, and cannot ping the TFTP server from R1. What is an action that can help to isolate this problem?

Use correct source file name in the command.
Verify that the TFTP server software is running.
Make sure that there is enough room on the TFTP server for the
backup.
Check that R1 has a route to the network where the TFTP server
resides.

12. Refer to the exhibit. Partial results of the show access-lists and show ip interface FastEthernet 0/1 commands for router Router1 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 networks? Apply the ACL in

Apply the ACL in the inbound direction.
Apply the ACL on the FastEthernet 0/0 interface.
Reverse the order of the TCP protocol statements in the ACL.
Modify the second entry in the list to permit tcp host 172.16.10.10 any
eq telnet .

13. What component of VPN technology combines message text with a key to make the message unreadable by unauthorized receivers?

message hash
user password
RSA signature
encryption algorithm

14. Which variable is permitted or denied by a standard access control list?

protocol type
source IP address
source MAC address
destination IP address
destination MAC address

15. 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.

16. Refer to the exhibit. RIPv2 has been configured on all routers in the network. Routers R1 and R3 have not received any RIP routing updates. What will fix the issue?

Enable RIP authentication on R2.
Issue the ip directed-broadcast command on R2.
Change the subnet masks to 10.11.12.0/8 and 172.16.40.0/16 on R2.
Enable CDP on R2 so that the other routers will receive routing
updates.

17. What name is given to the location where a customer network interfaces with a network that is owned by another organization?

CPE
DCE
local loop
demarcation point

18. Refer to the exhibit. What is placed in the address field in the header of a frame that will travel from the Orlando router to the DC router?

DLCI 123
DLCI 321
10.10.10.25
10.10.10.26
MAC address of the DC router

19. Refer to the exhibit. Communication between two peers has failed. Based on the output that is shown, what is the most likely cause?

interface reset
unplugged cable
improper LMI type
PPP negotiation failure

20. What will be the result of adding the command ip dhcp excluded-address 10.10.4.1 10.10.4.5 to the configuration of a local router that has been configured as a DHCP server?

Traffic that is destined for 10.10.4.1 and 10.10.4.5 will be dropped by
the router.
Traffic will not be routed from clients with addresses between
10.10.4.1 and 10.10.4.5.
The DHCP server will not issue the addresses ranging from 10.10.4.1
to 10.10.4.5.
The router will ignore all traffic that comes from the DHCP servers with
addresses 10.10.4.1 and 10.10.4.5.

21. What functionality do access control lists provide when implementing dynamic NAT on a Cisco router?

which addresses are allowed to be accessed from the inside network
which addresses are allowed out of the router
which addresses are assigned to a NAT pool
which addresses are to be translated

22. Which statement about a VPN is true?

VPN link establishment and maintenance is provided by LCP.
DLCI addresses are used to identify each end of the VPN tunnel.
VPNs use virtual Layer 3 connections that are routed through the
Internet.
Only IP packets can be encapsulated by a VPN for tunneling through
the Internet.

23. Refer to the exhibit. Results of the show vlan and show vtp status commands for switches S1 and S2 are displayed in the exhibit. VLAN 11 was created on S1. Why is VLAN 11 missing from S2?

There is a Layer 2 loop.
The VTP domain names do not match.
Only one switch can be in server mode.
S2 has a higher spanning-tree priority for VLAN 11 than S1 does.

24. 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 also successfully ping using the mail server name. At which layer of the OSI model is the problem most likely to be found?

physical layer
network layer
data link layer
application layer

25. Which data link layer encapsulation protocol is used by default for serial connections between two Cisco routers?

ATM
Frame Relay
HDLC
PPP
SDLC

26. A network administrator has changed the VLAN configurations on his network switches over the past weekend. How can the administrator determine if the additions and changes improved performance and availability on the company intranet?

Conduct a performance test and compare with the baseline that was
established previously.
Interview departmental secretaries and determine if they think load
time for web pages has improved.
Determine performance on the intranet by monitoring load times of
company web pages from remote sites.
Compare the hit counts on the company web server for the current
week to the values that were recorded in previous weeks.

27. Which statement accurately describes a role that is played in establishing a WAN connection?

ISDN and ATM are circuit-switched technologies that are used to
establish on demand a path through the service provider network.
Data link layer protocols like PPP and HDLC define how data is
encapsulated for transmission across a WAN link.
A packet-switching network establishes a dedicated circuit between
nodes for the duration of the communication session.
Frame Relay switches are normally considered to be customer premises
equipment (CPE) and are maintained by local administrators.

28. Refer to the exhibit. What is the meaning of the term dynamic in the output of the command?

The bandwidth capability of the interface increases and decreases
automatically based on BECNs.
The Serial0/0/1 interface acquired 172.16.3.1 from a DHCP server.
The mapping between DLCI 100 and 172.16.3.1 was learned through
Inverse ARP.
DLCI 100 will automatically adapt to changes in the Frame Relay cloud.

29. What is an accurate description of CHAP when used with PPP on a serial connection between two routers?

A username and password are sent to the peer router, which replies
with an accept or reject message.
A username and password are sent to the peer router. If these match
the configuration in the peer, the peer in turn provides a username
and password to the initiating router.
A challenge message is sent to the peer router, which responds with its
username and a calculated value based on a shared secret. This value
is then compared by the challenger to its own calculations.
An encrypted password is sent to the peer router, which decrypts it
and compares it to a shared secret. If the decrypted passwords
match, the peer sends the encrypted password back to the initiating
router.

30. Which technology is used to dynamically map next hop, network layer addresses to virtual circuits in a Frame Relay network?

Inverse ARP
LMI
DLCI

31. Refer to the exhibit. A network administrator is trying to connect R1 remotely to make configuration changes. Based on the exhibited command output, what will be the result when attempting to connect to R1?

failure to connect due to Telnet not being enabled
failure to connect due to incomplete configuration for Telnet
a successful connection and ability to make configuration changes
a successful connection but inability to make configuration changes
because of the absence of an enable secret password

32. A DHCP server is configured with a block of excluded addresses. What two devices would be assigned static addresses from the excluded address range? (Choose two.)

Select the two correct answers
a protocol analyzer
DNS server for the network
network printer that is used by many different users
a laptop that will get a different address each time it boots up

33. Refer to the exhibit. The corporate network that is shown has been assigned network 172.16.128.0/19 for use at branch office LANs. If VLSM is used, what mask should be used for addressing hosts at Branch4 with minimal waste from unused addresses?

/19
/20
/21
/22
/23
/24

34. Compared with IDS systems, what can IPS systems do to provide further protection of computer systems?

detect potential attacks
stop the detected attack from executing
update OS patches for computer systems
scan computer systems for viruses and spyware

35. A company has its headquarters office in Dallas and five branch offices located in New York, Chicago, Los Angeles, Seattle, and Atlanta. WAN links are used for communications among offices in six sites. In planning the WAN links, the network designer is given two requirements: (1) minimize cost and (2) provide a certain level of WAN link reliability with redundant links. Which topology should the network designer recommend?

star
full mesh
hierarchical
partial mesh

36. Refer to the exhibit. Every time the administrator reboots this router, the boot process ends in setup mode. What is a possible problem?

There is insufficient RAM for the IOS to load on this router.
A password recovery process should be done on this router.
The bootstrap version and the version of the IOS are different.
The IOS image is damaged and must be reloaded using tftpdnld.
The configuration register is set to ignore the startup configuration.

37. An administrator issues the command show interfaces s0/1/0 on a router that is configured for Frame Relay. Which console output may indicate an LMI mismatch?

Serial0/1/0 is administratively down
Serial0/1/0 is up, line protocol is up
Serial0/1/0 is up, line protocol is down
Serial0/1/0 is down, line protocol is down

38. Refer to the exhibit. Users who are connected to R1 report that they are unable to establish connectivity to the users who are connected to router R2. A network administrator tests the link with the debug ppp authentication command. Based on the output shown, which statement correctly defines the problem on the link?

R1 uses PAP as a method of authentication, and R2 uses CHAP.
R1 uses CHAP as a method of authentication, and R2 uses PAP.
R1 uses an incorrect user name or password for CHAP authentication.
R2 uses an incorrect user name or password for PAP authentication.

39. Which IP address and wildcard mask combination can be used in an ACL statement to match the 172.16.0.0/30 network?

172.16.0.0 0.0.0.1
172.16.0.0 0.0.0.3
172.16.0.0 0.0.0.7
172.16.0.0 255.255.255.252

40. A company is looking for a WAN solution to connect its headquarters site to four remote sites. What are two advantages that dedicated leased lines provide compared to a shared Frame Relay solution? (Choose two.)

Select the two correct answers
reduced jitter
reduced costs
reduced latency
the ability to burst above guaranteed bandwidth
the ability to borrow unused bandwidth from the leased lines of other
customers

41. Refer to the exhibit. R1 is performing NAT overload for the 10.1.1.0/24 inside network. Host A has sent a packet to the web server. What is the destination IP address of the return packet from the web server?

10.1.1.2:1234
172.30.20.1:1234
172.30.20.1:3333
192.168.1.2:80

42. What function does LCP perform in the establishment of a PPP session?

LCP brings the network layer protocols up and down.
It carries packets from several network layer protocols.
It encapsulates and negotiates options for IP and IPX.
It negotiates and sets up control options on the WAN data link.

43. An employee of XYZ corporation will begin working from home. The employee has a choice of DSL or cable technology for WAN connectivity. Which connectivity characteristic is accurately described?

Cable transfer rates are dependent on the length of the local loop.
DSL provides a high-speed connection over existing copper phone
wires.
DSL download speeds are affected by high usage in the area.
DSL service shares the same frequency range as voice calls.
Cable connectivity usually requires new fiber installed for the local
loop.

44. Which option represents a best practice for applying ACLs?

Named ACLs are less efficient than numbered ACLs.
Standard ACLs should be applied inside the core layer.
ACLs applied to outbound interfaces use fewer router resources.
Extended ACLs should be applied closest to the source that is specified
by the ACL.

45. 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
network layer
data link layer
physical layer

46. Which two configurations must be completed before an RSA key can be generated on a router? (Choose two.)

Select the two correct answers
a hostname
a domain name
the SSH version
the SSH timeouts
local authentication on the VTY lines

47. What type of ACL can be used to force a user to authenticate to the router before accessing a network?

standard
dynamic
reflexive
time-based

48. What is the result when the command security passwords min-length 8 is entered into a router?

All new passwords are required to be a minimum of 8 characters in
length.
All current passwords are now required to be a minimum of 8
characters in length.
Enable passwords must be at least 8 characters but line passwords are
unaffected.
Nothing will happen until the command service password-encryption is
entered. Then all future passwords must have a minimum of 8
characters.

49. 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?

network layer
data link layer
physical layer
application layer

50. What is the result when the command permit tcp 10.25.132.0 0.0.0.255 any eq smtp is added to a named access control list and applied on the inbound interface of a router?

TCP traffic with a destination to the 10.25.132.0/24 is permitted.
Only Telnet traffic is permitted to the 10.24.132.0/24 network
Ttraffic from 10.25.132.0/24 is permitted to anywhere on using any
port.
Traffic using port 25 from the 10.25.132.0/24 is permitted to all
destinations.