Chapter 5

Question 1

The following commands were entered on a router:
Router(config)# access-list 2 deny 172.16.5.24
Router(config)# access-list 2 permit any
The ACL is correctly applied to an interface. What can be concluded about this set of commands?

Answer 1

The wildcard mask 0.0.0.0 is assumed.

Question 2

Interface s0/0/0 already has an IP ACL applied inbound. What happens when the network administrator attempts to apply a second inbound IP ACL?

Answer 2

The second ACL is applied to the interface, replacing the first.

Question 3

Which two statements are correct about extended ACLs? (Choose two)

Answer 3

Extended ACLs evaluate the source and destination addresses.

Port numbers can be used to add greater definition to an ACL.

Question 4

Which benefit does an extended ACL offer over a standard ACL?

Answer 4

In addition to the source address, an extended ACL can also filter on destination address, destination port, and source port.

Question 5

Refer to the exhibit. How will Router1 treat traffic matching the time-range requirement of EVERYOTHERDAY?

Answer 5

Telnet traffic entering fa0/0 from 10.1.1.254/24 destined to the 172.16.1.0/24 network is permitted.

Question 6

Which three statements describe ACL processing of packets? (Choose three.)

Answer 6

An implicit deny any rejects any packet that does not match any ACL statement.
A packet can either be rejected or forwarded as directed by the statement that is matched.
Each statement is checked only until a match is detected or until the end of the ACL statement list.

Question 7

Refer to the exhibit. The administrator wishes to block web traffic from 192.168.1.50 from reaching the default port of the web service on 192.168.3.30. To do this, the access control list name is applied inbound on the router R1 LAN interface. After testing the list, the administrator has noted that the web traffic remains successful. Why is web traffic reaching the destination?

Answer 7

The range of source addresses specified in line 10 does not include host 192.168.1.50.

Question 8

Which feature will require the use of a named ACL rather than a numbered ACL?

Answer 8

the ability to edit the ACL and add additional statements in the middle of the list without removing and re-creating the list

Question 9

Which two statements are true regarding the significance of the access control list wildcard mask 0.0.0.7? (Choose two.)

Answer 9

The last 3 bits of a given IP address will be ignored.

The first 29 bits of a given IP address will be checked

Question 10

Where should a standard access control list be placed?

Answer 10

close to the destination

Question 11

How do Cisco standard ACLs filter traffic?

Answer 11

by source IP address

Question 12

Which two statements are true regarding named ACLs? (Choose two.)

Answer 12

Names can be used to help identify the function of the ACL.

Certain complex ACLs, such as reflexive ACLs, must be defined with named ACLs.

Question 13

Refer to the exhibit. What will be the effect of the configuration that is shown?

Answer 13

Users attempting to access hosts in the 192.168.30.0/24 network will be required to telnet to R3.

Question 14

Refer to the exhibit. An administrator has configured two access lists on R1. The list inbound on the serial interface is named Serial and the list inbound on the LAN interface is named LAN. What affect will be produced by the access control lists?

Answer 14

PC1 will not be able to telnet to R3 and PC3 will not be able to communicate with PC1.

Question 15

Which two statements are true regarding the following extended ACL? (Choose two.)
access-list 101 deny tcp 172.16.3.0 0.0.0.255 any eq 20
access-list 101 deny tcp 172.16.3.0 0.0.0.255 any eq 21
access-list 101 permit ip any any

Answer 15

FTP traffic originating from network 172.16.3.0/24 is denied.
Web traffic originating from 172.16.3.0 is permitted.

Question 16

Which statement about standard ACLs is true?

Answer 16

They should be placed as close to the destination as possible.

Question 17

Refer to the exhibit. Which statement is true about ACL 110 if ACL 110 is applied in the inbound direction on S0/0/0 of R1?

Answer 17

It will permit any TCP traffic that originated from network 172.22.10.0/24 to return inbound on the S0/0/0 interface.

Question 18

Which three parameters can ACLs use to filter traffic? (Choose three.)

Answer 18

protocol suite
source address
destination address

Question 19

Refer to the exhibit. How does this access list process a packet with the source address 10.1.1.1 and a destination of 192.168.10.13?

Answer 19

It is dropped because it does not match any of the items in the ACL

Question 20

By default, how is IP traffic filtered in a Cisco router?

Answer 20

permitted in and out of all interfaces

Question 21

Refer to the exhibit. When creating an extended ACL to deny traffic from the 192.168.30.0 network destined for the Web server 209.165.201.30, where is the best location for applying the ACL?

Answer 21

R3 Fa0/0 inbound

Question 22

Refer to the exhibit. ACL 120 is configured inbound on the serial0/0/0 interface on router R1, but the hosts on network 172.11.10.0/24 are able to telnet to network 10.10.0.0/16. On the basis of the provided configuration, what should be done to remedy the problem?

Answer 22

Apply the ACL outbound on the serial0/0/0 interface on router R1.

Question 23

A network administrator needs to allow traffic through the firewall router for sessions that originate from within the company network, but the administrator must block traffic for sessions that originate outside the network of the company. What type of ACL is most appropriate?

Answer 23

reflexive

Question 24

A technician is creating an ACL and needs a way to indicate only the subnet 172.16.16.0/21. Which combination of network address and wildcard mask will accomplish the desired task?

Answer 24

172.16.16.0 0.0.7.255

Question 25

Which three items must be configured before a dynamic ACL can become active on a router? (Choose three.)

Answer 25

extended ACL
authentication
Telnet connectivity