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| Section | Objectives |
|---|---|
| Topic 1: Networking Fundamentals | - OSI and TCP/IP models - IPv4/IPv6 addressing basics - Subnetting concepts - Routing fundamentals |
| Topic 2: Junos OS Fundamentals | - Operational vs configuration mode - Configuration hierarchy and commit model - Junos OS architecture - Junos CLI navigation and commands |
| Topic 3: Routing Fundamentals in Junos | - Dynamic routing overview - OSPF basics - Static routing |
| Topic 4: Security and Network Services Basics | - NAT concepts overview - Firewall filters basics |
| Topic 5: Configuration and Monitoring | - Monitoring and troubleshooting tools - System services and users - Interface configuration |
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NEW QUESTION # 79
Click the Exhibit button.
Referring to the exhibit, what is the source IP address of the ping that was executed?
Answer: C
Explanation:
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.
NEW QUESTION # 80
Referring to the exhibit, which two actions will occur when a packet matches the firewall filter?
(Choose two.)
term limit-icmp { from {
source-address {
172.25.11.0/24;
}
protocol icmp;
}
then {
count count-icmp; discard;
}
}
Answer: B,D
Explanation:
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.
NEW QUESTION # 81
Which two statements are correct about Junos OS? (Choose two.)
Answer: B,D
Explanation:
Junos OS is built with a modular architecture where individual processes run independently, improving stability and fault isolation. It also separates the control plane (Routing Engine) from the forwarding plane (Packet Forwarding Engine), enhancing performance and reliability.
NEW QUESTION # 82
An administrator wants to set up a remote user authentication service for the many users that access a Juniper security device. In this scenario, what are two supported authentication protocols? (Choose two.)
Answer: A,C
Explanation:
RADIUS and TACACS+ are supported centralized authentication protocols used for remote user authentication on Juniper devices, enabling integration with external authentication servers.
NEW QUESTION # 83
Exhibit:
You have configured multiple authentication methods on your Junos device, including RADIUS, TACACS+, and local user accounts. A user attempts to log in, but the RADIUS server is unavailable. Referring to the exhibit, which statement is correct?
Answer: A
Explanation:
In the Junos OS architecture, the authentication-order statement within the [edit system] hierarchy defines the sequence in which the device attempts to validate user credentials against external and internal databases. The order specified in the exhibit is [ radius tacplus password ] , meaning the device first queries the RADIUS server, followed by the TACACS+ server, and finally the local password database.
A critical distinction in Junos authentication logic is the difference between a server being " unavailable " and a server " rejecting " a user. If an authentication server responds with an explicit access-reject (meaning it received the request but the credentials were invalid), the authentication process terminates immediately to maintain security integrity. However, if the server is unreachable or fails to respond within the configured timeout period (unavailable), the Junos Control Plane automatically falls back to the next method in the defined sequence. In this specific scenario, since the RADIUS server is unavailable, the device will proceed to attempt authentication using the TACACS+ server. If that were also unavailable, it would finally check the local password database. This fallback mechanism ensures that administrators can still access the device even during external server outages, provided they have a local account configured as the final method in the list.
Reference: User Interfaces, System Authentication, Authentication Order and Fallback.
NEW QUESTION # 84
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