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| Section | Objectives |
|---|---|
| Topic 1: BGP and Routing Policy | - BGP fundamentals
|
| Topic 2: Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
| Topic 3: MPLS and Service Provider Technologies | - VPN services
|
| Topic 4: OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| Topic 5: Troubleshooting and Operations | - Performance and monitoring
|
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NEW QUESTION # 168
Which two statements about graceful restart are correct? (Choose two.)
Answer: A,D
Explanation:
Graceful Restart (GR)is a high-availability mechanism designed to minimize the impact of a routing protocol process (rpd) restart or a Routing Engine (RE) switchover. It allows a router to continue forwarding traffic while the control plane is recovering, provided that the data plane (Packet Forwarding Engine) remains intact.
According to Juniper Networks documentation, Graceful Restart operates in two distinct roles:
* Restarting Mode:This is the role of the router that is actually undergoing the restart. In Junos OS, this mode isnot enabled by default (Option A). An administrator must explicitly configure graceful-restart under the [edit routing-options] hierarchy to allow the router to signal its neighbors that it is attempting a graceful recovery.
* Helper Mode:This is the role of the neighboring routers. When a neighbor sees a router restart, if it is in "helper mode," it will continue to forward traffic toward the restarting router and will not flush the associated routes from its forwarding table for a specified period. In Junos,helper mode is enabled by default (Option B)for most protocols (OSPF, BGP, IS-IS). This means that even if you haven't configured GR on your own router, it will automatically assist its neighbors if they perform a graceful restart.
Why other options are incorrect:
* Option C:WhileGRES (Graceful Routing Engine Switchover)is often usedwithGraceful Restart to handle hardware-level RE failures, they are independent features. GR can function during a simple software process restart without dual REs or GRES.
* Option D:Nonstop Bridging (NSB)is a separate high-availability feature for Layer 2 protocols (like STP). While it shares a similar goal, Graceful Restart is specifically a Layer 3 protocol mechanism (Layer 2 does not use "helper" routers in the same way).
NEW QUESTION # 169
Click the Exhibit button. Referring to the exhibit, why is the ge-0/0/0.0 interface shown as belonging to Level 3?
Answer: A
Explanation:
In Junos IS-IS output, Level 3 indicates that the adjacency is operating for both Level 1 and Level
2. This shorthand appears for point-to-point interfaces where a single adjacency can simultaneously support both IS-IS levels between the routers.
NEW QUESTION # 170
How are routing loops prevented in external BGP networks?
Answer: B
Explanation:
BGP prevents routing loops by examining the AS path attribute in received route advertisements.
If a router detects its own autonomous system number in the AS path, it discards the route. This mechanism ensures that routes that have already passed through the same AS are not accepted again, preventing routing loops between autonomous systems.
NEW QUESTION # 171
Exhibit:
user@R1> show route 10.16.2.0/23 exact detail
inet.0: 12 destinations, 12 routes (11 active, 0 holddown, 1 hidden)
10.16.2.0/23 (1 entry, 1 announced)
*Aggregate Preference: 130
Next hop type: Reject
Address: 0x8f3fd44
Next-hop reference count: 2
State: <Active Int Ext>
Age: 1:39:21
Task: Aggregate
Announcement bits (1): 0-KRT
AS path: I (LocalAgg)
Flags: Depth: 0 Active
AS path list:
AS path: I Refcount: 2
Contributing Routes (2):
10.16.2.0/24 proto Direct
10.16.3.0/24 proto Direct
Which destination IP address will be matched by the aggregate route shown in the exhibit?
Answer: C
Explanation:
In the Juniper Networks Junos operating system,aggregate routesare used to represent a group of more specific routes with a single, shorter prefix. This technique is essential for reducing the size of routing tables and minimizing the volume of routing updates sent to neighbors. According to Juniper technical documentation, for a destination IP address to "match" a specific route, it must fall within the range defined by the network address and its associated CIDR mask.
The provided exhibit shows a detailed lookup for the aggregate route$10.16.2.0/23$. To determine the range of IP addresses covered by a $/23$ mask, we examine the binary representation of the third octet. A $/23$ mask means the first 23 bits are fixed. For the address $10.16.2.0$:
* The first two octets ($10.16$) are fixed.
* The third octet ($2$) is $00000010$ in binary.
* The 23rd bit is the second-to-last bit of this octet.
* The $/23$ range allows the 24th bit (the last bit of the third octet) and all 8 bits of the fourth octet to vary.
This results in a range where the third octet can be either $2$ ($00000010$) or $3$ ($00000011$). Therefore, the aggregate route $10.16.2.0/23$ covers all IP addresses from$10.16.2.0$ to $10.16.3.255$. The exhibit further confirms this by listing the "Contributing Routes": $10.16.2.0/24$ and $10.16.3.0/24$.
Analyzing the provided options against this range:
* 10.16.3.79 (Option A):This address falls squarely within the $10.16.2.0$ to $10.16.3.255$ range.
* 10.16.0.4 (Option B):This address falls in the $10.16.0.0/23$ range ($0.0$ to $1.255$).
* 10.16.4.183 (Option C):This address falls in the $10.16.4.0/23$ range ($4.0$ to $5.255$).
* 10.16.1.214 (Option D):This address also falls in the $10.16.0.0/23$ range.
Consequently,10.16.3.79is the only destination listed that matches the aggregate route shown. It is also important to note theNext hop type: Rejectin the exhibit; this means that if a packet matches the aggregate but does not match any of the more specific contributing routes, the router will drop the packet and send an ICMP unreachable message to the source.
NEW QUESTION # 172
You are asked to configure filter-based forwarding on a Junos device. Which two statements are correct in this scenario? (Choose two.)
Answer: C,D
Explanation:
Filter-based forwarding in Junos requires the creation of a routing policy to specify the match conditions and actions and the application of a match filter to classify traffic to use the policy.
NEW QUESTION # 173
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