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Free JN0-280 Exam Braindumps (page: 8)

Page 7 of 18
PDF with 65 Questions

Which statement is correct about IBGP?

  1. It requires a physical full mesh.
  2. It requires a logical full mesh.
  3. It ensures that the local and remote peers use different AS numbers.
  4. It ensures that duplicate AS numbers are not present in the AS path.

Answer(s): B

Explanation:

In IBGP (Internal Border Gateway Protocol), all routers within the same AS (Autonomous System) must have a logical full-mesh topology. This means that every IBGP router must be able to communicate with every other IBGP router directly or indirectly to ensure proper route propagation.
Step-by-Step Breakdown:
Logical Full Mesh:
In an IBGP setup, routers do not re-advertise routes learned from one IBGP peer to another IBGP peer. This rule is in place to prevent routing loops within the AS. To ensure full route propagation, a logical full mesh is required, meaning every IBGP router must peer with every other IBGP router in the AS. This can be done either directly or via route reflection or confederation.
Physical Full Mesh Not Required:
The physical topology does not need to be a full mesh, but the BGP peering relationships must form a logical full mesh. Techniques like route reflectors or BGP confederations can reduce the need for manual full-mesh peering.


Reference:

IBGP Configuration: IBGP logical full mesh requirements can be simplified using route reflectors to avoid the complexity of manually configuring many IBGP peers.



Which three technologies improve high availability and convergence in a data center network? (Choose three.)

  1. graceful restart (GR)
  2. Bidirectional Forwarding Detection (BFD)
  3. link loss adjacency
  4. Failover Group (FG)
  5. link aggregation group (LAG)

Answer(s): A,B,E

Explanation:

High availability and fast convergence are critical in data center networks to minimize downtime and maintain optimal performance. The following technologies contribute to achieving these goals:
Graceful Restart (GR):
GR allows routers to maintain forwarding state during control plane restarts, ensuring continuous packet forwarding while minimizing network disruptions.
Bidirectional Forwarding Detection (BFD):
BFD provides fast detection of path failures, allowing routing protocols to converge quickly by detecting link failures much faster than traditional timers.
Link Aggregation Group (LAG):
LAG increases both redundancy and bandwidth by combining multiple physical links into one logical link, providing load balancing and fault tolerance.


Reference:

High Availability Techniques: These technologies are fundamental in ensuring rapid recovery and failover within Juniper-based data center environments.



Which two statements are correct about rules for EBGP and IBGP? (Choose two.)

  1. EBGP peers have a TTL of 1, while IBGP peers have a TTL of 255.
  2. EBGP peers have a TTL of 255, while IBGP peers have a TTL of 1.
  3. EBGP routes are more preferred than IBGP routes.
  4. IBGP routes are more preferred than EBGP routes.

Answer(s): A,C

Explanation:

EBGP (External BGP) and IBGP (Internal BGP) operate with different rules due to the nature of their relationships.
Step-by-Step Breakdown:
TTL Differences:
EBGP: By default, EBGP peers have a TTL of 1, meaning they must be directly connected, or the TTL needs to be manually increased for multihop EBGP.
IBGP: IBGP peers within the same AS have a TTL of 255, as they are expected to communicate over multiple hops within the AS.
Preference for EBGP Routes:
Routes learned via EBGP are typically preferred over IBGP routes. This is because EBGP routes are considered more reliable since they originate outside the AS, while IBGP routes are internal.


Reference:

BGP Configuration: The different handling of TTL and route preferences between EBGP and IBGP ensures proper route selection and security within Junos-based networks.



Which statement is correct about an IRB interface?

  1. An IRB interface switches traffic within the same VLAN.
  2. An IRB interface trunks together VLANs on different switches.
  3. An IRB interface is a physical Layer 3 interface that connects VLANs together.
  4. An IRB interface is a Layer 3 interface that can be used to route between VLANs.

Answer(s): D

Explanation:

An IRB (Integrated Routing and Bridging) interface provides routing functionality between VLANs at Layer 3, allowing devices in different VLANs to communicate with each other.
Step-by-Step Breakdown:
IRB Functionality:
The IRB interface enables routing between different VLANs by acting as a Layer 3 gateway. Traffic within the same VLAN is handled by Layer 2 switching, while traffic between VLANs is routed through the IRB interface.
Layer 3 Routing Between VLANs:
Each VLAN can be assigned an IP address on the IRB interface, which allows traffic to flow between VLANs based on Layer 3 IP routing.


Reference:

IRB Interface Configuration: Juniper supports IRB for inter-VLAN routing on devices like the EX and QFX series switches, facilitating Layer 3 communication in data centers.






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