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| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting and Operations | - Network troubleshooting methodology
|
| Topic 2: BGP and Routing Policy | - BGP fundamentals
|
| Topic 3: OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
| Topic 4: Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
| Topic 5: MPLS and Service Provider Technologies | - VPN services
|
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NEW QUESTION # 59
How are routing loops prevented in internal BGP networks?
Answer: D
Explanation:
The prevention of routing loops within an Autonomous System (AS) is handled differently than loop prevention between ASes. While External BGP (EBGP) uses the AS_PATH attribute to detect loops,Internal BGP (IBGP)does not modify the AS_PATH. Therefore, a different mechanism is required to ensure that a route does not circulate infinitely inside the network.
This mechanism is known as theIBGP Split Horizon rule. According to Juniper Networks documentation and the BGP standard (RFC 4271), a BGP speakermust not advertise a route learned via an IBGP peer to any other IBGP peer. In simpler terms, "what is learned internally, stays local." This rule ensures that a route only travels one "hop" inside the AS-from the router that learned it from an external source to all other internal routers.
Because of this rule, IBGP routers do not naturally propagate routes through each other. This creates a requirement for afull meshof IBGP sessions, where every BGP-speaking router in the AS must have a direct peering session with every other BGP-speaking router. To mitigate the scaling issues of a full mesh in large service provider networks, architects useRoute ReflectorsorConfederations, which are authorized exceptions to the Split Horizon rule.
Option B is incorrect because EBGP peersdoadvertise EBGP routes to other EBGP peers (this is how the internet works). Option C is incorrect because EBGP-learned routesmustbe sent to IBGP peers so the internal network knows how to reach the outside world. Option D is incorrect because internal routesmustbe sent to external peers to advertise your network to the internet.
NEW QUESTION # 60
What information is determined by using the AS path attribute included in the BGP update message? (Choose two.)
Answer: A,D
Explanation:
TheAS_PATHattribute is a "well-known mandatory" attribute in BGP, meaning it must be present in every BGP Update message exchanged between External BGP (eBGP) peers. It records the sequence of Autonomous System numbers that a route has traversed. Per Juniper Networks Service Provider documentation, this attribute serves two fundamental purposes:
1. Loop Prevention (Option B):
This is the most critical function of the AS_PATH. When a BGP router receives an update from an eBGP peer, it scans the AS_PATH attribute for its own AS number. If the router finds its local AS number already listed in the path, it concludes that the route has already passed through its network and has "looped" back. To prevent an infinite routing loop, the router will immediately discard the update. This mechanism is the cornerstone of BGP's stability as a path-vector protocol.
2. Path Selection / Shortest Path Determination (Option C):
BGP uses a complex "tie-breaking" algorithm to select the best path among multiple candidates. One of the highest-ranking criteria in this algorithm (after Weight, Local Preference, and AS_PATH length) is the length of the AS_PATH. A shorter AS_PATH (fewer AS numbers listed) is generally preferred over a longer one, as it typically represents a more direct path through the internet hierarchy.
Why other options are incorrect:
* Option A:The "origin" of a route (IGP, EGP, or Incomplete) is determined by theORIGINattribute, which is a separate well-known mandatory attribute.
* Option D:BGP does not count individual "next-hop devices" (which would be an IGP metric like hop count in RIP); it only tracks Autonomous Systems. A single AS in the path might contain hundreds of internal routers (next-hops), but BGP only sees it as one "hop" in the AS_PATH.
NEW QUESTION # 61
You are monitoring OSPF on a router and notice frequent state changes between Full and Down. Which condition would cause this behavior?
Answer: C
Explanation:
When troubleshooting OSPF in a service provider environment, distinguishing between "stuck" adjacencies and "flapping" adjacencies is the first step. A session that transitions frequently betweenFullandDown indicates that the relationship can be established successfully (meaning parameters match), but it cannot be maintained.
According to Juniper Networks documentation, the most common cause for a session to drop from Full to Down is the expiration of theDead Interval. If a router does not receive a Hello packet within the Dead Interval (usually 40 seconds), it tears down the adjacency. Aphysical interface flapping (Option A)is the primary trigger for this. If the physical link or the underlying transport (like a leased line or a microwave link) goes down even momentarily, the OSPF process immediately detects the interface failure, flushes the neighbors, and moves the state to Down. As soon as the interface comes back up, the routers perform the Hello exchange and reach the Full state again, creating the flapping cycle.
Analysis of other options:
* MTU Mismatch (Option D):This typically causes the adjacency to get "stuck" in theExchangeor ExStartstate. The routers can exchange small Hello packets, but when they try to send larger Database Description (DBD) packets that exceed the MTU, the packets are dropped, preventing the session from ever reaching "Full."
* Area ID Mismatch (Option C):This prevents the adjacency from even reaching theInitstate; the routers will never form a neighbor relationship.
* Route Preference (Option B):This affects which route is chosen for the forwarding table but has no impact on the OSPF neighbor state machine itself.
NEW QUESTION # 62
Which IPv6 address type is used as an identifier for a group of IPv6 interfaces that might belong to different nodes, typically, the nearest node?
Answer: D
NEW QUESTION # 63
Referring to the exhibit, from which device(s) does R3 learn about Route X?
Answer: D
Explanation:
R2 can not forward IBGP learned routes to another IBGP neighbor correct R3 will learn about Route X from R2 only. R1 is in a separate AS and Route X is advertised to R2 through eBGP. R2 will then advertise the route to R3 using iBGP. R3 cannot learn routes directly from another AS without having a direct eBGP session with that AS.
NEW QUESTION # 64
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