Which layer of the OSI model contains the IP address information?

1. A. Layer 2
2. B. Layer 3
3. C. Layer 1
4. D. Layer 4

Correct Answer: B
The OSI (Open Systems Interconnection) model is a conceptual framework used to understand network interactions in seven distinct layers. IP (Internet Protocol) addresses are part of Layer 3, known as the Network Layer. This layer is responsible for packet forwarding, including routing through intermediate routers, and it handles the logical addressing scheme of the network to ensure that packets can be routed across multiple networks and reach their destination. IP addresses provide unique identifiers for network interfaces, allowing for communication between devices on a network or across different networks.

Click the Exhibit button.

Referring to the exhibit, what is the source IP address of the ping that was executed?

1. A. 10.12.0.2
2. B. 10.23.0.2
3. C. 10.23.0.3
4. D. 10.24.0.4

Correct Answer: B
The exhibit shows a ping test being executed from router R2 to the IP address 10.23.0.3. Since the ping command is issued on R2 and we see successful replies from 10.23.0.3, it means the source of the ping must be an interface on R2. Given the network diagram and the IP address scheme, the source IP address of the ping is on the interface ge-0/0/2 of R2, which is in the subnet 10.23.0.0/24. The only logical IP address for R2's interface in this subnet, based on standard networking practices and the given options, would be 10.23.0.2. The other addresses provided in the options belong to different subnets or are the destination of the ping itself.

Exhibit
term limit-icmp { from { source-address { 172.25.11.0/24;
}
protocol icmp;
}
then {
count count-icmp; discard;
}
}
Referring to the exhibit, which two actions will occur when a packet matches the firewall filter? (Choose two.)

1. A. An ICMP destination unreachable message will be returned.
2. B. The packet will be forwarded.
3. C. The packet will be discarded.
4. D. A counter will be incremented.

Correct Answer: C
Referring to the firewall filter configuration in the exhibit, when a packet matches the specified term limit-icmp, two actions are defined in the then statement: count count-icmp and discard. The count count-icmp action means that each time a packet matches this term, a counter named count-icmp will be incremented, providing a tally of how many packets have matched the term. The discard action means that the packet will be dropped and not forwarded through the device. This effectively prevents the packet from reaching its intended destination. There is no action specified that would cause an ICMP destination unreachable message to be returned, nor is there any action that would allow the packet to be forwarded.

Exhibit
[edit]
user@routerl set interfaces ge-0/1/2 unit 0 family inet address 172.16.101.1/24 [edit]
user@router# commit check
configuration check succeeds
[edit]
user@router#
You need to configure interface ge-0/1/2 with an IP address of 172.16.100.1/24. You have accidentally entered 172.16.101.1/24 as shown in the exhibit.
Which command should you issue to solve the problem?

1. A. (edit] user@router# rollback 1
2. B. [edit] user@router# rollback 2
3. C. [edit] userOrouter# rollback 0
4. D. [edit] user@routeri rollback rescue

Correct Answer: A
If you've committed a configuration and then need to revert to the previous configuration, the rollback command is used. Since the incorrect IP address has not been committed, as indicated by the commit check command being successful, issuing rollback 1 will undo the changes made in the current session, which includes the accidental entry of the IP address.