JN0-280 Practice Test Questions Answers Updated 187 Questions
JN0-280 dumps & JNCIA-DC Sure Practice with 187 Questions
The JN0-280 exam covers a wide range of topics, including data center architecture, Juniper Networks hardware, virtualization technologies, Layer 2 and Layer 3 switching, routing protocols, and security technologies. Candidates must demonstrate their proficiency in these areas to pass the exam and earn the JNCIA-DC certification. JN0-280 exam comprises multiple-choice questions and simulations that test the candidate's ability to configure and troubleshoot Juniper Networks technologies in a data center environment. The JN0-280 exam is an excellent way for professionals to enhance their skills and advance their careers in the data center networking field.
NEW QUESTION # 55
In OSPF, which command is commonly used to monitor neighbor relationships?
- A. show ospf interfaces
- B. show ospf database
- C. show ip ospf neighbors
- D. show ip route ospf
Answer: C
NEW QUESTION # 56
Exhibit:
How many stages are shown in the exhibit?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
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 # 57
What roles do the Designated Router (DR) and Backup Designated Router (BDR) play in OSPF?
- A. They redistribute routes between OSPF and non-OSPF networks.
- B. They determine the shortest path first algorithm.
- C. They reduce the number of adjacencies on broadcast networks.
- D. They are responsible for generating LSAs for external routes.
Answer: C
NEW QUESTION # 58
Which statement is correct about areas in OSPF?
- A. An OSPF area is used to segment Layer 2 broadcast domains.
- B. An OSPF area is used to signify the autonomous system to which each device belongs.
- C. OSPF areas are used to isolate the effects of a broadcast storm.
- D. OSPF areas are used to reduce the size of the link-state database.
Answer: D
Explanation:
InOSPF (Open Shortest Path First), areas are used to segment a network into smaller, more manageable pieces to improve scalability. By dividing a network into areas, OSPF can reduce the size of thelink-state database (LSDB), which helps routers process updates more efficiently.
Step-by-Step Breakdown:
* Purpose of OSPF Areas:OSPF areas allow for hierarchical routing within the OSPF domain. Routers in the same area have identical LSDBs, but routers in different areas do not exchange full link-state information. Instead, they exchange summarized routes, which reduces the LSDB size and CPU
/memory usage.
* Benefits:Reducing the LSDB size improves scalability and ensures faster convergence in larger networks. Area 0 is the backbone area, and all other areas must connect to it, forming a hierarchical structure.
Juniper Reference:
* OSPF Configuration: Areas in OSPF are configured to optimize network performance by limiting the scope of link-state advertisements (LSAs) to within an area.
NEW QUESTION # 59
Which OSPF packet types are used to establish and maintain neighbor relationships? (Choose two)
- A. Link State Request packets
- B. Hello packets
- C. Link State Update packets
- D. Database Description packets
Answer: B,D
NEW QUESTION # 60
When using spine and leaf fabric architectures, what is the role of each device? (Choose two.)
- A. Leaf nodes are used for host connectivity.
- B. Spine nodes are used for host connectivity.
- C. Leaf nodes are used for traffic to other leafs.
- D. Spine nodes are used for transit to other leaf nodes.
Answer: A,D
Explanation:
In aspine-leaf fabric architecture, which is commonly used in data center designs, each device has a distinct role to ensure efficient and scalable network traffic flow.
Step-by-Step Breakdown:
* Spine Nodes:
* Thespine nodesform the backbone of the fabric and are responsible fortransit traffic between leaf nodes. They connect to every leaf switch and provide multiple paths for traffic between leaf nodes, ensuring redundancy and load balancing.
* Leaf Nodes:
* Theleaf nodesare used forhost connectivity. These switches connect to servers, storage, or edge routers. They also connect to the spine switches to reach other leaf switches.
Juniper Reference:
* Spine-Leaf Architecture: In Juniper's IP fabric designs,spine switcheshandle inter-leaf communication, whileleaf switchesmanage host and endpoint connectivity.
NEW QUESTION # 61
Which two statements about IBGP are correct? (Choose two.)
- A. IBGP uses full mesh for loop prevention.
- B. By default, IBGP has a TTL of 255.
- C. By default, IBGP has a TTL of 1.
- D. IBGP uses AS path for loop prevention.
Answer: A,B
Explanation:
IBGP (Internal Border Gateway Protocol)is used to exchange routing information betweenrouters within the same AS (Autonomous System).
Step-by-Step Breakdown:
* TTL of 255:
* By default, IBGP sessions are established with aTTL (Time to Live)value of255. This allows IBGP neighbors to communicate over multiple hops within the AS without requiring any additional configuration.
* Full Mesh Requirement:
* IBGP requires alogical full meshbetween all IBGP routers to ensure that routing information is fully distributed within the AS. Since IBGP does not propagate routes learned from one IBGP peer to another by default, a full mesh topology is needed unlessroute reflectorsorBGP confederationsare used.
Juniper Reference:
* IBGP Full Mesh: Juniper recommends using route reflectors in large networks to simplify IBGP full- mesh requirements.
NEW QUESTION # 62
In the context of Link Aggregation Groups (LAG), what is the primary purpose of LACP?
- A. To reduce the speed of data transfer
- B. To dynamically manage the bundling of several physical ports
- C. To provide a method for encrypting data packets
- D. To increase the error rate in data transmission
Answer: B
NEW QUESTION # 63
What are two common reasons for BGP routes to be in the hidden state? (Choose two.)
- A. Routes are being filtered from the inet.2 routing table
- B. The BGP neighbor is in a different autonomous system
- C. The next hop is unresolvable
- D. Routes are being rejected by a policy
Answer: C,D
NEW QUESTION # 64
When configuring OSPF, what is the purpose of defining areas?
- A. To provide network redundancy.
- B. To specify different encryption methods.
- C. To control route advertisement and manage traffic.
- D. To assign different IP address ranges.
Answer: C
NEW QUESTION # 65
Which LSA types are associated with OSPF? (Choose three)
- A. External LSA (Type 5)
- B. Router LSA (Type 1)
- C. Summary LSA (Type 3)
- D. Network LSA (Type 2)
Answer: B,C,D
NEW QUESTION # 66
Which two protocols can you use for a data center underlay network? (Choose two)
- A. OSPF
- B. EVPN
- C. VXLAN
- D. EBGP
Answer: A,D
NEW QUESTION # 67
Which statement about switches is correct?
- A. All ports reside in the same collision domain.
- B. Every port is in a unique collision domain.
- C. Each port is in a unique broadcast domain by default.
- D. Each port is a member of VLAN 2 by default.
Answer: B
Explanation:
Each port on a modernswitchcreates a separatecollision domain. This allows multiple devices to communicate simultaneously without collisions on different ports.
Step-by-Step Breakdown:
* Collision Domain:
* Acollision domainis a network segment where data packets can collide if two devices send packets simultaneously.
* On a switch, each port creates aseparate collision domain, so collisions only occur if two devices connected to the same port (through a hub, for instance) try to send data at the same time.
* Switches vs Hubs:Unlike hubs, which have one large collision domain, switches isolate collisions to individual ports, improving performance.
Juniper Reference:
* Switch Port Behavior: In Juniper switches, each port operates in its own collision domain, enhancing network efficiency by reducing the chances of packet collisions.
NEW QUESTION # 68
Which of the following are true about Layer 2 and Layer 3 strategies in data center architectures? (Choose two)
- A. Layer 2 strategies are primarily used for inter-data center connectivity.
- B. Layer 3 strategies cannot be used in conjunction with Layer 2 environments.
- C. Layer 2 strategies are typically used for creating large, flat networks.
- D. Layer 3 strategies help in reducing broadcast domains.
Answer: C,D
NEW QUESTION # 69
Which signaling protocol is used for EVPN?
- A. IS-IS
- B. OSPF
- C. PIM
- D. BGP
Answer: D
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 # 70
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