R&S Lesson 7

In which configuration would an outbound ACL placement be preferred over an inbound ACL placement?

• when an interface is filtered by an outbound ACL and the network attached to the interface is the source network being filtered within the ACL

• when an outbound ACL is closer to the source of the traffic flow

• when a router has more than one ACL

• when the ACL is applied to an outbound interface to filter packets coming from multiple inbound interfaces before the packets exit the interface

Which address is required in the command syntax of a standard ACL?

• source MAC address

• destination MAC address

• source IP address

• destination IP address

Which statement describes a difference between the operation of inbound and outbound ACLs?

• On a network interface, more than one inbound ACL can be configured but only one outbound ACL can be configured.

• Inbound ACLs are processed before the packets are routed while outbound ACLs are processed after the routing is completed.

• Inbound ACLs can be used in both routers and switches but outbound ACLs can be used only on routers.

• In contrast to outbound ALCs, inbound ACLs can be used to filter packets with multiple criteria.

Which three statements describe ACL processing of packets?

• Each statement is checked only until a match is detected or until the end of the ACE list.

• A packet that does not match the conditions of any ACE will be forwarded by default.

• A packet that has been denied by one ACE can be permitted by a subsequent ACE.

• A packet can either be rejected or forwarded as directed by the ACE that is matched.

• An implicit deny any rejects any packet that does not match any ACE.

What single access list statement matches all of the following networks?

192.168.16.0

192.168.17.0

192.168.18.0

192.168.19.0

• access-list 10 permit 192.168.16.0 0.0.3.255

• access-list 10 permit 192.168.16.0 0.0.0.255

• access-list 10 permit 192.168.16.0 0.0.15.255

• access-list 10 permit 192.168.0.0 0.0.15.255

What wildcard mask is used if you want to deny all hosts from the 172.16.20.0/26 network?

• 0.0.0.255

• 0.0.0.192

• 0.0.63.255

• 0.0.0.63

Which two configuration commands can be used to configure a standard ACL so that only the workstation of the administrator with the IP address 10.10.10.11 can access the virtual terminal of the main router.

• Router1(config)# access-list 10 permit 10.10.10.11 0.0.0.0

• Router1(config)# access-list 10 permit 10.10.10.11 0.0.0.255

• Router1(config)# access-list 10 permit 10.10.10.11 255.255.255.0

• Router1(config)# access-list 10 permit 10.10.10.11 255.255.255.255

• Router1(config)# access-list 10 permit host 10.10.10.11

If a router has two interfaces and is routing both IPv4 and IPv6 traffic, how many ACLs could be created and applied to it?

• 2

• 4

• 6

• 8

• 16

Which three statements are generally considered to be best practices in the placement of ACLs?

• Place standard ACLs close to the source IP address of the traffic.

• Place extended ACLs close to the destination IP address of the traffic.

• Filter unwanted traffic before it travels onto a low-bandwidth link.

• Place extended ACLs close to the source IP address of the traffic.

• Place standard ACLs close to the destination IP address of the traffic.

Refer to the following output. What is the significance of the 4 match(es) statement?

R1# <output omitted>

10 permit 192.168.1.56 0.0.0.7

20 permit 192.168.1.64 0.0.0.63 (4 match(es))

30 deny any (8 match(es))

• Four packets have been allowed through the router to reach the destination network of 192.168.1.64/26.

• Four packets have been allowed through the router from PCs in the network of 192.168.1.64.

• Four packets have been denied that are destined for the 192.168.1.64 network.

• Four packets have been denied that have been sourced from any IP address.