JN0-280 Certification Training & JN0-280 Exam Dumps & JN0-280 Study Guide
JN0-280 Certification Training & JN0-280 Exam Dumps & JN0-280 Study Guide
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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q164-Q169):
NEW QUESTION # 164
Which signaling protocol is used for EVPN?
- A. IS-IS
- B. PIM
- C. BGP
- D. OSPF
Answer: C
Explanation:
EVPN (Ethernet Virtual Private Network)is a standard protocol used for building Layer 2 and Layer 3 VPNs over an IP or MPLS network. Thesignaling protocolused for EVPN isBGP(Border Gateway Protocol).
Step-by-Step Breakdown:
* BGP as the EVPN Signaling Protocol:EVPN uses BGP to exchange MAC address reachability information between routers (PE devices). This enables devices to learn which MAC addresses are reachable through which PE devices, facilitating Layer 2 forwarding across an IP or MPLS core.
* BGP Extensions for EVPN:BGP is extended with new address families (e.g., EVPN NLRI) to carry both MAC and IP address information, allowing for scalable and efficient multi-tenant network solutions.
Juniper Reference:
* Junos EVPN Configuration: Juniper uses BGP as the control plane for EVPN to exchange MAC and IP route information between different data center devices.
NEW QUESTION # 165
Referring to the exhibit, why are the BGP routes hidden?
- A. Load balancing is not enabled.
- B. The BGP next hop is unreachable.
- C. Other routes are selected because of better metrics.
- D. There are too many hops to the destination.
Answer: B
Explanation:
In the exhibit, the BGP routes are marked ashidden. This typically happens when the routes are not considered valid for use, but they remain in the routing table for reference. One common reason for BGP routes being hidden is that thenext hopfor these routes is unreachable.
Step-by-Step Breakdown:
* BGP Next Hop:In BGP, when a route is received from a neighbor, thenext hopis the IP address that must be reachable for the route to be used. If the next hop is unreachable (i.e., the router cannot find a path to the next-hop IP), the route is marked as hidden.
* Analyzing the Exhibit:The exhibit shows that the BGP next hop for all hidden routes is 10.4.4.4. If this IP is unreachable, the BGP routes from that neighbor will not be considered valid, even though they appear in the routing table.
* Verification:
* Use the command show route 10.4.4.4 to check if the next-hop IP is reachable.
* If the next-hop is not reachable, the BGP routes will be hidden. Resolving the next-hop reachability issue (e.g., fixing an IGP route or an interface) will allow the BGP routes to become active.
Juniper Reference:
* Junos Command: show route hidden displays routes that are not considered for forwarding.
* Troubleshooting: Check the next hop reachability for hidden BGP routes using show route <next-hop>.
NEW QUESTION # 166
Exhibit:
How many stages are shown in the exhibit?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
The exhibit shows aFolded IP Clos Architecture, which is also referred to as a3-stage Closnetwork design.
This architecture typically consists of two layers of switches:
* Spine Layer: The top row of switches.
* Leaf Layer: The bottom row of switches.
Step-by-Step Breakdown:
* Clos Architecture:A 3-stage Clos network has two types of devices: spine and leaf. In this design, each leaf switch connects to every spine switch, providing a high level of redundancy and load balancing.
* Stage Explanation:
* Stage 1: The first set of leaf switches.
* Stage 2: The spine switches.
* Stage 3: The second set of leaf switches.
TheFolded Closarchitecture shown here effectively "folds" the 3-stage design by combining the ingress and egress leaf layers into one, reducing it to two visible layers, but still maintaining the overall3-stage architecture.
Juniper Reference:
* IP Clos Architecture: The 3-stage Clos design is commonly used in modern data centers for high availability, redundancy, and scalability.
NEW QUESTION # 167
What is the primary difference between IBGP and EBGP?
- A. The use of AS_PATH attribute
- B. The administrative distance
- C. The way they advertise routes
- D. The requirement for a full mesh topology
Answer: B
NEW QUESTION # 168
What is the primary purpose of using static routes in a network?
- A. To provide a manually configured routing entry
- B. To generate routing entries dynamically
- C. To aggregate multiple routes into one
- D. To automatically adjust routes based on network traffic
Answer: A
NEW QUESTION # 169
......
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