CN Chapter 4 6.0

Which range represents all the IP addresses that are affected when network 10.120.160.0 with a wildcard mask of 0.0.7.255 is used in an ACE?

• 10.120.160.0 to 10.127.255.255

• 10.120.160.0 to 10.120.167.255

• 10.120.160.0 to 10.120.168.0

• 10.120.160.0 to 10.120.191.255

What two functions describe uses of an access control list? (Choose two.)

• ACLs assist the router in determining the best path to a destination.

• Standard ACLs can restrict access to specific applications and ports.

• ACLs provide a basic level of security for network access.

• ACLs can permit or deny traffic based upon the MAC address originating on the router.

• ACLs can control which areas a host can access on a network.

Which two statements describe the effect of the access control list wildcard mask 0.0.0.15? (Choose two.)

• The first 28 bits of a supplied IP address will be ignored.

• The last four bits of a supplied IP address will be ignored.

• The first 32 bits of a supplied IP address will be matched.

• The first 28 bits of a supplied IP address will be matched.

• The last five bits of a supplied IP address will be ignored.

Refer to the exhibit. A network administrator is configuring an ACL to limit the connection to R1 vty lines to only the IT group workstations in the network 192.168.22.0/28. The administrator verifies the successful Telnet connections from a workstation with IP 192.168.22.5 to R1 before the ACL is applied. However, after the ACL is applied to the interface Fa0/0, Telnet connections are denied. What is the cause of the connection failure?

• The permit ACE specifies a wrong port number.

• The enable secret password is not configured on R1.

• The login command has not been entered for vty lines.

• The IT group network is included in the deny statement.

• The permit ACE should specify protocol ip instead of tcp.

Refer to the exhibit. The network administrator that has the IP address of 10.0.70.23/25 needs to have access to the corporate FTP server (10.0.54.5/28). The FTP server is also a web server that is accessible to all internal employees on networks within the 10.x.x.x address. No other traffic should be allowed to this server. Which extended ACL would be used to filter this traffic, and how would this ACL be applied? (Choose two.)

• access-list 105 permit ip host 10.0.70.23 host 10.0.54.5

  access-list 105 permit tcp any host 10.0.54.5 eq www

  access-list 105 permit ip any any

• access-list 105 permit tcp host 10.0.54.5 any eq www

  access-list 105 permit tcp host 10.0.70.23 host 10.0.54.5 eq 20

  access-list 105 permit tcp host 10.0.70.23 host 10.0.54.5 eq 21

• access-list 105 permit tcp host 10.0.70.23 host 10.0.54.5 eq 20

  access-list 105 permit tcp host 10.0.70.23 host 10.0.54.5 eq 21

  access-list 105 permit tcp 10.0.0.0 0.255.255.255 host 10.0.54.5 eq www

  access-list 105 deny ip any host 10.0.54.5

  access-list 105 permit ip any any

• R2(config)# interface gi0/0

  R2(config-if)# ip access-group 105 in

• R1(config)# interface s0/0/0

  R1(config-if)# ip access-group 105 out

network administrator is designing an ACL. The networks 192.168.1.0/25, 192.168.0.0/25, 192.168.0.128/25, 192.168.1.128/26, and 192.168.1.192/26 are affected by the ACL. Which wildcard mask, if any, is the most efficient to use when specifying all of these networks in a single ACL permit entry?

• 0.0.0.127

• 0.0.0.255

• 0.0.1.255

• 0.0.255.255

• A single ACL command and wildcard mask should not be used to specify these particular networks or other traffic will be permitted or denied and present a security risk.

Refer to the exhibit. A network administrator wants to permit only host 192.168.1.1 /24 to be able to access the server 192.168.2.1 /24. Which three commands will achieve this using best ACL placement practices? (Choose three.)

• R2(config)# access-list 101 permit ip host 192.168.1.1 host 192.168.2.1

• R2(config)# access-list 101 permit ip 192.168.1.0 255.255.255.0 192.168.2.0 255.255.255.0

• R2(config)# interface fastethernet 0/0

• R2(config-if)# ip access-group 101 out

• R2(config-if)# ip access-group 101 in

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

• Extended ACLs use a number range from 1-99.

• Extended ACLs end with an implicit permit statement.

• Extended ACLs evaluate the source and destination addresses.

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

• Multiple ACLs can be placed on the same interface as long as they are in the same direction.

Which three values or sets of values are included when creating an extended access control list entry? (Choose three.)

• access list number between 1 and 99

• access list number between 100 and 199

• default gateway address and wildcard mask

• destination address and wildcard mask

• source address and wildcard mask

Refer to the exhibit. This ACL is applied on traffic outbound from the router on the interface that directly connects to the 10.0.70.5 server. A request for information from a secure web page is sent from host 10.0.55.23 and is destined for the 10.0.70.5 server. Which line of the access list will cause the router to take action (forward the packet onward or drop the packet)?

• 1

• 2

• 3

• 4

• the deny ip any any that is at the end of every ACL