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| Section | Objectives |
|---|---|
| Topic 1: Routing Fundamentals in Junos | - Dynamic routing overview - Static routing - OSPF basics |
| Topic 2: Configuration and Monitoring | - System services and users - Monitoring and troubleshooting tools - Interface configuration |
| Topic 3: Security and Network Services Basics | - NAT concepts overview - Firewall filters basics |
| Topic 4: Networking Fundamentals | - Routing fundamentals - Subnetting concepts - IPv4/IPv6 addressing basics - OSI and TCP/IP models |
| Topic 5: Junos OS Fundamentals | - Configuration hierarchy and commit model - Junos OS architecture - Operational vs configuration mode - Junos CLI navigation and commands |
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NEW QUESTION # 29
You asked a network engineer to configure a new logical interface on a Juniper router. The interface must use the fourth usable host address from the 172.16.40.128/29 subnet. Which IP address is correct in this scenario?
Answer: D
Explanation:
A /29 subnet contains 8 addresses. For 172.16.40.128/29, the network address is 172.16.40.128 and the broadcast address is 172.16.40.135, leaving usable hosts 172.16.40.129 through
172.16.40.134. The fourth usable host is 172.16.40.132.
NEW QUESTION # 30
Your system administrator notified the infrastructure team that all server NICs will be moving to jumbo frames. All of the NICs used by servers are 1 gigabit. The starting frame size will be 4K. The exact frame size may change depending on testing results. In this scenario, which choice would provide a flexible solution?
Answer: B
Explanation:
In large-scale Junos deployments, efficiency and flexibility are achieved through the use of configuration groups . When faced with a requirement like moving all 1-gigabit interfaces to jumbo frames-with the caveat that the exact MTU value (e.g., 4000 bytes) might change after testing-manually editing every interface is both tedious and prone to error.
By creating a configuration group under the [edit groups] hierarchy, you can define the MTU parameter once.
You then use the apply-groups statement at the [edit interfaces] level or on specific interface ranges. This creates a " template " effect. The flexibility comes into play during the testing phase: if results indicate that a
9000-byte MTU is preferable to 4000 bytes, the architect only needs to modify the value in the group definition. The Junos OS inheritance mechanism automatically propagates this update to every interface associated with that group.
Applying MTU at the family level (Option B) is less efficient and doesn ' t handle the physical Layer 2 MTU requirements of jumbo frames as effectively. Path-MTU discovery (Option D) is a protocol-level function for avoiding fragmentation but does not configure the local interface ' s hardware capability to accept larger frames. Thus, groups represent the best practice for centralized, scalable management.
Reference: Configuration Basics, Junos Groups, Interface MTU Configuration.
NEW QUESTION # 31
What is the purpose of the "commit check" command in Junos OS when working within configuration mode before applying any changes to the system?
Answer: C
Explanation:
The "commit check" command validates the configuration syntax and logic before applying it. It ensures that errors are caught early without impacting the running configuration. This is especially useful in production environments to prevent service disruptions due to incorrect configurations.
NEW QUESTION # 32
Which Junos tool should you use to identify the path that packets take through the network to a destination?
Answer: D
Explanation:
The traceroute command shows the path packets take to a destination by displaying each hop along the route.
NEW QUESTION # 33
What are two examples of exception traffic? (Choose two.)
Answer: B,C
Explanation:
Exception traffic is traffic that requires special handling by the Routing Engine (RE) rather than being simply forwarded by the Packet Forwarding Engine (PFE). This type of traffic is generally meant for the device itself rather than for transit through the device.
routing updates: Routing protocol updates (such as OSPF, BGP, or RIP) are destined for the Routing Engine because they are processed by the control plane to maintain the routing table.
Thus, they are also considered exception traffic.
ping to the local device: When you ping the local device (the router or switch itself), the packet is directed to the Routing Engine, as it requires a response from the device. This is an example of exception traffic.
NEW QUESTION # 34
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