JN0-280 Premium PDF & Test Engine Files with 187 Questions & Answers [Q103-Q119]

JN0-280 Juniper

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JN0-280 Premium PDF & Test Engine Files with 187 Questions & Answers [Q103-Q119]

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JN0-280 Premium PDF & Test Engine Files with 187 Questions & Answers

Get 100% Real JN0-280 Exam Questions, Accurate & Verified Answers As Seen in the Real Exam!

NO.103 In the Junos OS, which feature is used to create an alternate next hop with a unique preference for a static route?

Preference

Resolve

Next-hop

Qualified-next-hop

In Junos OS, thequalified-next-hopfeature is used to specify an alternate next hop for a static route, along with a unique preference value.
Step-by-Step Breakdown:
* Qualified-Next-Hop:Aqualified-next-hopallows you to define multiple next hops for a static route, each with its own preference. This provides flexibility by allowing the router to choose the best available next hop based on reachability and preference.
* Use Case:If the primary next hop becomes unreachable, the router can automatically switch to the alternate next hop defined by thequalified-next-hopwith a higher preference value.
* Command Example:
set routing-options static route 10.10.10.0/24 qualified-next-hop 192.168.1.1 preference 5 set routing-options static route 10.10.10.0/24 qualified-next-hop 192.168.1.2 preference 10
* Preference:The next hop with the lowest preference is chosen first. If it becomes unavailable, the router will use the higher preference next hop.
Juniper Reference:
* Qualified-Next-Hop: This feature is used to configure backup or alternate next hops for static routes in Juniper devices.

NO.104 Which statement is correct about areas in OSPF?

An OSPF area is used to segment Layer 2 broadcast domains.

OSPF areas are used to isolate the effects of a broadcast storm.

OSPF areas are used to reduce the size of the link-state database.

An OSPF area is used to signify the autonomous system to which each device belongs.

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.

NO.105 In Ethernet switching, what is the primary function of a storm control policy?

To prevent loops in the network.

To restrict the rate of certain types of traffic.

To filter MAC addresses.

To segregate broadcast domains.

NO.106 What is the primary use of a virtual link in OSPF?

To connect OSPF areas to external networks.

To encrypt OSPF traffic.

To connect an OSPF area to the backbone area through a non-backbone area.

To balance load across multiple links.

NO.107 Fill in the blank: In BGP, the ___________ attribute is used to influence the best path selection process.

MED (Metric or Multi-Exit Discriminator)

AS_PATH

Local Preference

Community

NO.108 Layer 2 interfaces operate in which two modes? (Choose two.)

Access

Modular

Trunk

Tagged

Comprehensive Detailed Step by Step Explanation with all Juniper Data Center References Layer 2 interfaces on a switch operate in two key modes:AccessandTrunk.
Step-by-Step Breakdown:
* Access Mode:
* Access portsare used to connect end devices, like PCs or servers, and they are assigned to a single VLAN. These interfaces handle untagged traffic and do not pass VLAN tags.
* Example: A port assigned to VLAN 10 will only handle traffic for that VLAN.
* Trunk Mode:
* Trunk portsare used to connect switches or other networking devices that need to handle traffic from multiple VLANs. Trunk interfaces carry tagged traffic, allowing multiple VLANs to traverse the same physical link.
* Trunk ports typically use802.1QVLAN tagging to differentiate between VLANs.
Juniper Reference:
* Access and Trunk Ports: Juniper switches use these modes to manage VLAN traffic at Layer 2, with access ports handling untagged traffic and trunk ports handling tagged traffic from multiple VLANs.

NO.109 Which of the following are features of storm control on Junos switches? (Choose two)

It can be configured to shut down a port during a storm.

It supports thresholds for broadcast, multicast, and unknown unicast traffic.

It encrypts broadcast and multicast traffic.

It automatically reroutes traffic during a storm.

NO.110 Which two statements are correct about VLAN tags? (Choose two.)

VLAN tags carry a VLAN ID and priority.

VLAN tags are required on access ports.

VLAN tags require multiple forwarding tables.

VLAN tags can be inserted or removed by trunk interfaces.

VLAN tagsare used in Ethernet frames to identify and differentiate traffic between multiple VLANs. They are especially important for devices like switches that handle multiple VLANs on the same physical link.
Step-by-Step Breakdown:
* VLAN Tag Contents:
* VLAN ID: The tag contains a 12-bit VLAN ID field that identifies the VLAN to which the frame belongs.
* Priority: The tag also includes a 3-bit priority field (also known as 802.1p priority) used for QoS (Quality of Service) to prioritize traffic.
* Trunk Ports and VLAN Tagging:
* Trunk Portsare used to carry traffic for multiple VLANs across a single link. These interfaces insert (tag) VLAN identifiers into frames when they leave the switch and remove (untag) them when frames enter the switch.
* Access Ports:VLAN tags are typically not used onaccess ports(ports that connect to end devices) since those ports are configured to be part of a single VLAN, and the traffic doesn’t need VLAN tags.
Juniper Reference:
* VLAN Tagging: Juniper switches support VLAN tagging and ensure that frames are tagged or untagged as they traverse trunk or access ports, respectively.

NO.111 In OSPF, which term refers to routers that have interfaces in multiple areas?

Internal Routers

Backbone Routers

Area Border Routers (ABRs)

Autonomous System Boundary Routers (ASBRs)

NO.112 Generated routes in a network are mainly used to:

Reduce the overall size of the routing table.

Manually configure specific network routes.

Automatically create a route when a specified condition is met.

Summarize external routes into the network.

NO.113 Exhibit:

Referring to the exhibit, what is the route preference of the 172.25.11.254 next hop?

130

140

In the exhibit, we see two next-hop addresses for the default static route (0.0.0.0/0):
* The first next hop is172.25.11.254, with no specified preference.
* The second next hop is172.25.11.200, with a specified preference of140.
Step-by-Step Breakdown:
* Default Static Route Preference:If no preference is explicitly set for a next hop in Junos, it defaults to5 for static routes.
* Determining Preference:In this case, the next hop172.25.11.254does not have an explicit preference defined, so it will use the default value of5. The second next hop has a preference of140, which is higher,meaning it will only be used if the primary next hop is unavailable.
Juniper Reference:
* Static Route Preference: In Junos, the default preference for static routes is5, and this value is applied unless overridden by the preference parameter.

NO.114 When a MAC limiting violation occurs, the switch performs which two actions by default? (Choose two.)

No logging takes place.

It causes Layer 2 loops.

The port is disabled.

It drops the packet.

When aMAC limiting violationoccurs on a Juniper switch, the switch will perform the following actions by default:
Step-by-Step Breakdown:
* Port Disabled:When the number of MAC addresses on an interface exceeds the configured limit, the port isautomatically disabledto prevent further violations. This is a protective mechanism to prevent MAC address flooding.
* Packet Dropped:Additionally, packets from the violating MAC address aredroppedto prevent any further communication from that address. This ensures that only valid MAC addresses are allowed to communicate through the interface.
* Example Configuration:
set ethernet-switching-options secure-access-port interface <interface-name> mac-limit 5
* If more than five MAC addresses are learned, the port is disabled, and excess packets are dropped.
Juniper Reference:
* MAC Limiting: When the switch detects a MAC limiting violation, it disables the port and drops further packets from the violating MAC addresses to maintain network security.

NO.115 Which route is preferred by the Junos OS software routing tables?

Static

Aggregate

Direct

BGP

In Junos OS,direct routesare the most preferred routes in the routing table, having the highest priority.
Step-by-Step Breakdown:
* Direct Routes:
* Direct routes represent networks that are directly connected to the router’s interfaces. Since these routes are directly accessible, they are assigned the highest priority and always take precedence over other types of routes.
* Preference Values:
* Direct routes have apreference of 0, which is the most preferred in Junos. Static routes, OSPF routes, and BGP routes have higher preference values and will only be used if there are no direct routes to the destination.
Juniper Reference:
* Direct Route Preference: In Junos,direct routesare always preferred over other routes, ensuring that the router forwards traffic through locally connected networks.

NO.116 Exhibit:

How many stages are shown in the exhibit?

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.

NO.117 What is the default route preference for a static route on a Junos device?

130

NO.118 Which statement is correct about an IRB interface?

An IRB interface switches traffic within the same VLAN.

An IRB interface trunks together VLANs on different switches.

An IRB interface is a physical Layer 3 interface that connects VLANs together.

An IRB interface is a Layer 3 interface that can be used to route between VLANs.

AnIRB (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.
Juniper 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.

NO.119 When using spine and leaf fabric architectures, what is the role of each device? (Choose two.)

Spine nodes are used for host connectivity.

Spine nodes are used for transit to other leaf nodes.

Leaf nodes are used for traffic to other leafs.

Leaf nodes are used for host connectivity.

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.

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The JN0-280 certification exam covers a range of topics, including data center architecture, data center network implementation, and data center protocols. JN0-280 exam is designed to test the candidate’s ability to design and implement data center networks using Juniper Networks equipment. Data Center, Associate (JNCIA-DC) certification exam is intended for individuals who have a basic understanding of networking and data center technologies.

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