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NEW QUESTION # 153
You are asked to create a default route that will be advertised to your internal OSPF neighbors. You have three upstream connections to the Internet and you must ensure that when available, all traffic uses ISP1 as your primary connection and only uses ISP2 and ISP3 when ISP1 is not available.
Which solution should you implement in this scenario?
Answer: A
Explanation:
The solution that should be implemented in this scenario is to create a default generate route that includes an import policy to match BGP routes from ISP1 and assign a preference value of four or less. This way, the default route will be advertised to the internal OSPF neighbors only when there is a BGP route from ISP1 in the routing table, and it will have a higher preference than any other default route from ISP2 or ISP3. If ISP1 is not available, the default generate route will be withdrawn and the traffic will use the next available default route from ISP2 or ISP3.
Option A is incorrect because creating a default static route with ISP1's address as the next hop while specifying the addresses for ISP2 and ISP3 as qualified next hops with a preference value of six or higher will not ensure that the default route is advertised to the internal OSPF neighbors only when ISP1 is available. The default static route will always be in the routing table regardless of the availability of ISP1, and it will have a lower preference than any other default route from ISP2 or ISP3.
Option C is incorrect because creating a default static route with each neighbor address as the next hop will not ensure that all traffic uses ISP1 as the primary connection and only uses ISP2 and ISP3 when ISP1 is not available. The default static route will always be in the routing table regardless of the availability of ISP1, and it will load balance the traffic among the three ISPs.
Option D is incorrect because creating a default aggregated route will not ensure that the default route is advertised to the internal OSPF neighbors only when ISP1 is available. The default aggregated route will always be in the routing table regardless of the availability of ISP1, and it will not have any preference value associated with it. References:
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
NEW QUESTION # 154
You have configured a GRE tunnel. To reduce the risk of dropping traffic, you have configured a keepalive OAM probe to monitor the state of the tunnel; however, traffic drops are still occurring.
Referring to the exhibit, what is the problem?
Answer: D
Explanation:
For GRE tunnel keepalive to function properly, the hold time should be set to at least twice the keepalive interval to ensure proper detection and recovery of the tunnel state. In the exhibit, both keepalive-time and hold-time are set to 10 seconds, which is not optimal. The hold-time should be at least double the keepalive-time value.
So, to fix the issue, you should configure the hold-time to be 20 seconds or more.
NEW QUESTION # 155
You want to ensure traffic is routed through a GRE tunnel. In this scenario, which two statements will satisfy this requirement? (Choose two.)
Answer: A,D
Explanation:
Option A is correct. For traffic to be sent through a GRE tunnel, there must be a route that directs the traffic into the tunnel. This is typically accomplished through the use of a static route or a dynamic routing protocol.
Option B is correct. All intermediary devices must have a route to the tunnel endpoints. In real- world scenarios, the tunnel endpoints for a tunnel going over the Internet must have globally reachable internet addresses. Otherwise, intermediate routers in the Internet cannot forward the tunneled packets.
NEW QUESTION # 156
Which two statements about BGP facilitate the prevention of routing loops within an autonomous system?
(Choose two.)
Answer: A,B
Explanation:
BGP has a simple loop prevention mechanism for eBGP that checks the AS path for its own AS number.
However, this mechanism does not work for iBGP, since all routers in the same AS have the same AS number. Therefore, iBGP has two additional rules to prevent routing loops within an autonomous system:
A router does not advertise a route learned from an iBGP neighbor to another iBGP neighbor. This rule ensures that a route does not loop back to the original iBGP router through another iBGP path.
A router does not accept a route learned from an iBGP neighbor if the next hop is not reachable via an IGP.
This rule ensures that a router does not forward packets to an unreachable next hop.
These two rules imply that iBGP sessions must be configured as a logical full mesh, meaning that every iBGP router must have a direct iBGP session with every other iBGP router in the same AS. This way, every iBGP router can learn the best route from the eBGP routers and use the IGP to reach the next hop. A logical full mesh does not require a physical full mesh, meaning that iBGP routers do not have to be directly connected.
They can use intermediate routers to establish iBGP sessions, as long as the IGP can reach the next hop.
A logical full mesh can be challenging to scale and maintain, especially for large ASes with many iBGP routers. Therefore, some alternatives to the full mesh requirement have been developed, such as route reflectors and confederations. These alternatives relax the iBGP rules and introduce additional attributes and mechanisms to prevent routing loops, such as originator ID and cluster list. References:
BGP Fundamentals
BGP - eBGP loop prevention mechanism same AS number
Loop Prevention in BGP Routing
NEW QUESTION # 157
Referring to the exhibit, which configuration change is needed for an IS-IS Level 1 adjacency between R1 and R2?
Answer: B
NEW QUESTION # 158
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