CCNA Security Chapter 4

1.

1 point

What is one benefit of using a stateful firewall instead of a proxy server?

ability to perform packet filtering

ability to perform user authentication

prevention of Layer 7 attacks

better performance

2.

1 point

What is one limitation of a stateful firewall?

not as effective with UDP- or ICMP-based traffic

cannot filter unnecessary traffic

weak user authentication

poor log information

3.

1 point

To facilitate the troubleshooting process, which inbound ICMP message should be permitted on an outside interface?

echo reply

time-stamp reply

time-stamp request

echo request

router advertisement

4.

1 point

If the provided ACEs are in the same ACL, which ACE should be listed first in the ACL according to best practice?

permit udp any any range 10000 20000

permit ip any any

permit tcp 172.16.0.0 0.0.3.255 any established

deny tcp any any eq telnet

deny udp any host 172.16.1.5 eq snmptrap

permit udp 172.16.0.0 0.0.255.255 host 172.16.1.5 eq snmptrap

5.

1 point

Which two rules about interfaces are valid when implementing a Zone-Based Policy Firewall? (Choose two.)

If one interface is a zone member, but the other is not, all traffic will be passed.

If both interfaces belong to the same zone-pair and a policy exists, all traffic will be passed.

If one interface is a zone member and a zone-pair exists, all traffic will be passed.

If neither interface is a zone member, then the action is to pass traffic.

If both interfaces are members of the same zone, all traffic will be passed.

6.

1 point

A network administrator is implementing a Classic Firewall and a Zone-Based Firewall concurrently on a router. Which statement best describes this implementation?

An interface must be assigned to a security zone before IP inspection can occur.

The two models cannot be implemented on a single interface.

Both models must be implemented on all interfaces.

A Classic Firewall and Zone-Based Firewall cannot be used concurrently.

7.

1 point

The _______ action in a Cisco IOS Zone-Based Policy Firewall is similar to a permit statement in an ACL.

8.

1 point

A company is deploying a new network design in which the border router has three interfaces. Interface Serial0/0/0 connects to the ISP, GigabitEthernet0/0 connects to the DMZ, and GigabitEthernet/01 connects to the internal private network. Which type of traffic would receive the least amount of inspection (have the most freedom of travel)?

traffic that originates from the public network and that is destined for the DMZ

traffic that is going from the private network to the DMZ

traffic that is returning from the DMZ after originating from the private network

traffic that is returning from the public network after originating from the private network

9.

1 point

A router has been configured as a classic firewall and an inbound ACL applied to the external interface. Which action does the router take after inbound-to-outbound traffic is inspected and a new entry is created in the state table?

When traffic returns from its destination, it is reinspected, and a new entry is added to the state table.

A dynamic ACL entry is added to the external interface in the inbound direction.

The entry remains in the state table after the session is terminated so that it can be reused by the host.

The internal interface ACL is reconfigured to allow the host IP address access to the Internet.

10.

1 point

When an inbound Internet-traffic ACL is being implemented, what should be included to prevent the spoofing of internal networks?

ACEs to prevent broadcast address traffic

ACEs to prevent SNMP traffic

ACEs to prevent ICMP traffic

ACEs to prevent HTTP traffic

ACEs to prevent traffic from private address spaces

11.

1 point

Which command will verify a Zone-Based Policy Firewall configuration?

show interfaces

show protocols

show zones

show running-config

12.

1 point

Which statement describes a typical security policy for a DMZ firewall configuration?

Return traffic from the outside that is associated with traffic originating from the inside is permitted to traverse from the outside interface to the DMZ interface.

Return traffic from the inside that is associated with traffic originating from the outside is permitted to traverse from the inside interface to the outside interface.

Traffic that originates from the inside interface is generally blocked entirely or very selectively permitted to the outside interface.

Traffic that originates from the DMZ interface is selectively permitted to the outside interface.

Traffic that originates from the outside interface is permitted to traverse the firewall to the inside interface with few or no restrictions.

13.

1 point

Which type of packet is unable to be filtered by an outbound ACL?

ICMP packet broadcast packet

router-generated packet

multicast packet

ICMP packet

14.

1 point

Which command is used to activate an IPv6 ACL named ENG_ACL on an interface so that the router filters traffic prior to accessing the routing table?

ipv6 traffic-filter ENG_ACL in

ipv6 access-class ENG_ACL out

ipv6 access-class ENG_ACL in

ipv6 traffic-filter ENG_ACL out

15.

1 point

Refer to the exhibit. Which statement describes the function of the ACEs?

These are optional ACEs that can be added to the end of an IPv6 ACL to allow ICMP messages that are defined in object groups named nd-na and nd-ns.

These ACEs automatically appear at the end of every IPv6 ACL to allow IPv6 routing to occur.

These ACEs allow for IPv6 neighbor discovery traffic.

These ACEs must be manually added to the end of every IPv6 ACL to allow IPv6 routing to occur.

16.

1 point

Refer to the exhibit. The network “A” contains multiple corporate servers that are accessed by hosts from the Internet for information about the corporation. What term is used to describe the network marked as “A”?

DMZ

untrusted network

internal network

perimeter security boundary

17.

1 point

In addition to the criteria used by extended ACLs, what conditions are used by a classic firewall to filter traffic?

IP source and destination addresses

TCP/UDP source and destination port numbers

application layer protocol session information

TCP/IP protocol numbers

18.

1 point

Refer to the exhibit. If a hacker on the outside network sends an IP packet with source address 172.30.1.50, destination address 10.0.0.3, source port 23, and destination port 2447, what does the Cisco IOS firewall do with the packet?

The packet is forwarded, and an alert is generated.

The initial packet is dropped, but subsequent packets are forwarded.

The packet is dropped.

The packet is forwarded, and no alert is generated.

19.

1 point

Refer to the exhibit. The ACL statement is the only one explicitly configured on the router. Based on this information, which two conclusions can be drawn regarding remote access network connections? (Choose two.)

SSH connections from the 192.168.1.0/24 network to the 192.168.2.0/24 network are allowed.

SSH connections from the 192.168.2.0/24 network to the 192.168.1.0/24 network are allowed.

SSH connections from the 192.168.1.0/24 network to the 192.168.2.0/24 network are blocked.

Telnet connections from the 192.168.1.0/24 network to the 192.168.2.0/24 network are blocked.

Telnet connections from the 192.168.2.0/24 network to the 192.168.1.0/24 network are allowed.

Telnet connections from the 192.168.1.0/24 network to the 192.168.2.0/24 network are allowed.

20.

1 point

When a Cisco IOS Zone-Based Policy Firewall is being configured via CLI, which step must be taken after zones have been created?

Establish policies between zones.

Assign interfaces to zones.

Identify subsets within zones.

Design the physical infrastructure.

21.

1 point

Consider the following

access list.access-list 100 permit ip host 192.168.10.1 any

access-list 100 deny icmp 192.168.10.0 0.0.0.255 any echo

access-list 100 permit ip any any

Which two actions are taken if the access list is placed inbound on a router Gigabit Ethernet port that has the IP address 192.168.10.254 assigned? (Choose two.)

A Telnet or SSH session is allowed from any device on the 192.168.10.0 into the router with this access list assigned.

Devices on the 192.168.10.0/24 network are not allowed to ping other devices on the 192.168.11.0 network.

Only Layer 3 connections are allowed to be made from the router to any other network device.

Devices on the 192.168.10.0/24 network are not allowed to reply to any ping requests.

Only the network device assigned the IP address 192.168.10.1 is allowed to access the router.

22.

1 point

A _________ firewall monitors the state of connections as network traffic flows into and out of the organization.

23.

1 point

When a Cisco IOS Zone-Based Policy Firewall is being configured, which two actions can be applied to a traffic class? (Choose two.)

inspect

log

copy

forward

hold

drop