Pass Juniper JN0-281 Exam With Practice Test Questions Dumps Bundle [Q49-Q67]

JN0-281 Juniper

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Pass Juniper JN0-281 Exam With Practice Test Questions Dumps Bundle [Q49-Q67]

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Pass Juniper JN0-281 Exam With Practice Test Questions Dumps Bundle

2026 Valid JN0-281 test answers & Juniper Exam PDF

NO.49 MACsec provides protection against which two types of threats? (Choose two.)

Data decryption

Playback attacks

Hashing attacks

Man-in-the-middle attack

MACsec (Media Access Control Security) provides data confidentiality, integrity, and origin authenticity at Layer 2, protecting against several types of threats.
Step-by-Step Breakdown:
Man-in-the-Middle Attack Protection:
MACsec encrypts traffic at Layer 2, preventing man-in-the-middle attacks where an attacker intercepts and manipulates traffic between two communicating devices. Since the data is encrypted, any intercepted packets are unreadable.
Protection Against Playback Attacks:
MACsec also protects against playback attacks by using sequence numbers and timestamps to ensure that old, replayed packets are not accepted by the receiver.
Juniper Reference:
MACsec Configuration: Juniper devices support MACsec for securing Layer 2 communications, ensuring protection against replay and man-in-the-middle attacks in sensitive environments.

NO.50 Which VLAN tagging method inserts a 4-byte tag into the Ethernet frame?

ISL

Dot1Q

Q-in-Q

MPLS

NO.51 Exhibit:

Referring to the exhibit, which next hop will be preferred in the routing table?

Next hop IP address 172.25.20.254 will be preferred.

Neither next hop will be preferred.

Next hop IP address 172.25.20.200 will be preferred.

Both next hops will be preferred.

In the exhibit, we see a static route configuration with two possible next hops for the default route (0.0.0.0/0):
next-hop 172.25.20.254 with the default preference of 7.
qualified-next-hop 172.25.20.200 with a preference of 6.
Step-by-Step Breakdown:
Preference Value:
In Junos OS, the preference value is used to determine which route should be preferred in the routing table. The lower the preference value, the higher the priority for the route.
Comparison:
In this case:
The next hop 172.25.20.254 has a preference of 7.
The qualified-next-hop 172.25.20.200 has a preference of 6.
Preferred Next Hop:
Since 172.25.20.200 has a lower preference (6) compared to 172.25.20.254 (7), it will be the preferred next hop in the routing table, assuming both next hops are reachable.
Juniper Reference:
Qualified Next Hop: In Junos, static routes with multiple next-hop options are selected based on the preference value, with the lower value being preferred.

NO.52 Exhibit:

Referring to the exhibit, which two statements are correct about default BGP advertisements? (Choose two.)

When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router2.

When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router1.

When routes advertised by the SP router are received by router2, they will contain the next-hop address of the SP router.

When routes advertised by the SP router are received by router2, they will contain the next-hop address of router1.

The exhibit shows a BGP peering scenario between three routers: router1 and router2 are part of the same AS (AS65000), while the SP router is in a different AS (AS65101). This indicates an EBGP (External BGP) peering between the SP router and router1, and IBGP between router1 and router2.
Step-by-Step Breakdown:
Next-Hop Behavior in BGP:
IBGP: In IBGP, the next-hop address is not modified when advertising routes within the same AS. Thus, when router1 advertises routes learned from router2 to the SP router, it will keep the next-hop address of router1, not router2.
EBGP: In EBGP, the next-hop address is modified. When router1 receives routes from the SP router, it will advertise them to router2 with the next-hop address of router1.
Route Propagation:
Routes received by router1 from router2 will be advertised to the SP router with router1 as the next hop.
Similarly, routes advertised by the SP router will be passed on to router2, with router1 remaining as the next hop.
Juniper
Reference: BGP Next-Hop: Juniper’s BGP implementations follow standard BGP next-hop behavior, where the next-hop is modified in EBGP but not in IBGP, ensuring proper route advertisement across autonomous systems.

NO.53 Exhibit:

R2 received an OSPF update from R1, and it received the same update from R3.
Referring to the exhibit, what will R2 do?

R2 ignores the update from R1.

R2 does nothing with R3’s update.

R2 ignores the update from R3.

R2 acknowledges R3 and discards it.

In the exhibit, R2 receives the same OSPF update from both R1 and R3. OSPF has mechanisms to prevent unnecessary processing of duplicate LSAs (Link-State Advertisements).
Step-by-Step Breakdown:
OSPF LSA Processing:
OSPF uses LSAs to exchange link-state information between routers. When a router receives an LSA, it checks if it already has a copy of the LSA in its Link-State Database (LSDB).
Duplicate LSAs:
If R2 has already received and processed the update from R1, it will ignore the update from R3 because it already has the same LSA in its database. OSPF uses the concept of flooding, but it does not reprocess LSAs that it already knows about.
R2 Behavior:
R2 will keep the update from R1 (the first one it received) and will ignore the same LSA from R3, as it is already in the LSDB.
Juniper Reference:
OSPF LSA Processing: Junos adheres to OSPF standards, ensuring that duplicate LSAs are not processed multiple times to avoid unnecessary recalculations.

NO.54 What are two reasons why you would deploy an IP fabric instead of a traditional Layer 2 network in a data center? (Choose two.)

Layer 2 networks only support a single broadcast domain.

IP fabrics are better suited to smaller networks where scale is less important.

Layer 3 networks support load balancing.

Layer 2 networks are susceptible to loops.

IP fabrics are Layer 3-centric network designs often used in data centers due to their scalability, efficient routing, and loop-free architecture.
Step-by-Step Breakdown:
Layer 3 Load Balancing:
IP fabrics use Equal-Cost Multipath (ECMP) to distribute traffic across multiple paths, providing effective load balancing and improving bandwidth utilization. This capability is absent in traditional Layer 2 networks, which do not support ECMP for routing decisions.
Layer 2 Loops:
Layer 2 networks are prone to loops because of the lack of TTL (Time-to-Live) mechanisms. Spanning Tree Protocol (STP) is required to prevent loops, but it can introduce inefficiencies by blocking links. In contrast, IP fabrics based on Layer 3 protocols are loop-free and do not need STP. Juniper Reference: IP Fabric: Juniper’s IP fabric solutions offer efficient Layer 3 routing with built-in load balancing and loop prevention, making them ideal for modern data center architectures.

NO.55 Referring to the exhibit, how many stages are in this IP fabric?

NO.56 What are two requirements for an IP fabric? (Choose two.)

a Layer 3 routing protocol

a single connection between each spine and leaf

a single connection between each leaf

a Layer 2 switching protocol

An IP fabric is a network architecture commonly used in data centers to provide scalable, high-throughput connectivity using a spine-leaf topology.
Step-by-Step Breakdown:
Layer 3 Routing Protocol:
An IP fabric relies on a Layer 3 routing protocol, typically BGP or OSPF, to provide routing between the leaf and spine switches. This ensures efficient traffic forwarding across the network. Single Connection Between Spine and Leaf:
In an IP fabric, each leaf switch connects to every spine switch with a single connection. This ensures that traffic between any two leaf switches can travel through the spine layer in just two hops.
Juniper
Reference: Spine-Leaf Design: Juniper’s IP fabric implementations are designed for scalability and low-latency routing, often using protocols like BGP for Layer 3 control.

NO.57 Which of the following are correct about OSPF router ID selection? (Choose two)

It can be manually configured.

It is chosen based on the highest IP address of any active interface by default.

It is always the IP address of the loopback interface.

It is selected based on the lowest MAC address.

NO.58 You are configuring an aggregate route. In this scenario, which two statements are correct? (Choose two.)

Reject will silently drop the traffic.

Discard will silently drop the traffic.

Reject will send an ICMP Destination Unreachable message back to the sender.

Discard will send an ICMP Destination Unreachable message back to the sender.

When configuring an aggregate route, you have options for how to handle traffic that matches the route but does not match any more specific route in the routing table. Two actions can be taken: discard and reject.
Step-by-Step Breakdown:
Discard:
The discard option will silently drop packets that match the aggregate route. No notification is sent to the sender, and the packet is simply dropped.
Reject:
The reject option will drop the packet and also send an ICMP Destination Unreachable message back to the sender. This informs the sender that the packet could not be delivered because there is no specific route available.
Juniper Reference:
Aggregate Routes: The reject and discard next-hop options provide different levels of feedback when packets cannot be routed, and they can be used to control how unreachable destinations are handled.

NO.59 What is the primary purpose of using aggregate routes in a network?

To dynamically adjust to network changes

To summarize and reduce the number of routes in the routing table

To filter unwanted traffic

To statically define a route to a specific destination

NO.60 During a BGP Graceful Restart, what happens to the routes learned from the restarting neighbor?

They are immediately removed from the routing table.

They are marked as stale but kept in the routing table.

They are advertised to other BGP neighbors.

Their metric is increased to prevent their use.

NO.61 What are two requirements for an IP fabric? (Choose two.)

a Layer 3 routing protocol

a single connection between each spine and leaf

a single connection between each leaf

a Layer 2 switching protocol

An IP fabric is a network architecture commonly used in data centers to provide scalable, high-throughput connectivity using a spine-leaf topology.
Step-by-Step Breakdown:
Layer 3 Routing Protocol:
An IP fabric relies on a Layer 3 routing protocol, typically BGP or OSPF, to provide routing between the leaf and spine switches. This ensures efficient traffic forwarding across the network.
Single Connection Between Spine and Leaf:
In an IP fabric, each leaf switch connects to every spine switch with a single connection. This ensures that traffic between any two leaf switches can travel through the spine layer in just two hops.
Juniper Reference:
Spine-Leaf Design: Juniper’s IP fabric implementations are designed for scalability and low-latency routing, often using protocols like BGP for Layer 3 control.

NO.62 Which two prefixes are contributing routes to a 10.20.0.0/18 aggregate route? (Choose two)

10.20.0.0/24

10.20.60.0/23

10.20.0.0/16

10.20.100.0/24

NO.63 Which two statements are correct about rules for EBGP and IBGP? (Choose two.)

EBGP peers have a TTL of 1, while IBGP peers have a TTL of 255.

EBGP peers have a TTL of 255, while IBGP peers have a TTL of 1.

EBGP routes are more preferred than IBGP routes.

IBGP routes are more preferred than EBGP routes.

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. Juniper 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.

NO.64 Which two statements are correct about EVPN-VXLAN overlay networking? (Choose two.)

It is the only option to provide reachability between servers that reside in the same network segment in a data center.

BGP provides the control plane within the overlay network.

An encapsulation of the original packet is required to transport the packet across the network.

OSPF provides the control plane within the overlay network.

EVPN-VXLAN is an overlay technology used in data center networks to extend Layer 2 services over a Layer 3 network.
Step-by-Step Breakdown:
BGP Control Plane:
BGP (Border Gateway Protocol) is used as the control plane for EVPN-VXLAN. BGP advertises MAC addresses and IP address reachability information across the VXLAN network, enabling efficient multi-tenant Layer 2 connectivity over a Layer 3 infrastructure.
Encapsulation:
VXLAN (Virtual Extensible LAN) encapsulates Layer 2 frames into Layer 3 packets. This encapsulation allows Layer 2 traffic to be transported across a Layer 3 network, effectively creating a tunnel for Ethernet frames.
Juniper
Reference: EVPN-VXLAN Configuration: Juniper supports EVPN-VXLAN with BGP as the control plane, allowing scalable Layer 2 connectivity over a routed infrastructure in modern data centers.

NO.65 Which two statements are correct about using LACP on a Junos device? (Choose two.)

Both sides of the LACP session must be in active mode to exchange LACP packets on a Junos device.

One side of the LACP session must be in active mode to exchange LACP packets on a Junos device.

LACP is used to monitor the status of an aggregated Ethernet bundle’s member interfaces on a Junos device.

LACP is used to automatically add and delete interfaces from aggregated Ethernet bundles on a Junos device.

NO.66 Referring to the exhibit, you notice that after committing the configuration, the ae0 and ae1 interfaces appear in a link down state.

Which statement is correct in this scenario?

No operational interfaces have been added to the LAG interfaces.

No traffic is traversing the LAG interfaces.

The LAG interfaces are in a passive state.

The LAG interfaces are in aggressive mode.

In the exhibit, the ae0 and ae1 interfaces are in a link down state. This occurs when no physical interfaces (member interfaces) have been added to the LAG (Link Aggregation Group) interfaces, or the member interfaces are not operational.
Step-by-Step Breakdown:
LAG Configuration:
A LAG interface (aggregated Ethernet interface) is a logical interface that combines multiple physical interfaces for redundancy and increased bandwidth. The LAG will only be operational if at least one member interface is active and configured correctly.
No Operational Member Interfaces:
If no member interfaces are added or if the member interfaces are down, the LAG will remain in a down state, as shown in the exhibit for ae0 and ae1. Resolution:
Verify that physical interfaces have been added to the LAG using commands like:
LAG Interface Status: In Juniper, the link status of the LAG depends on its member interfaces, which must be operational for the LAG to function.

NO.67 What is the default route preference of a static route in the Junos OS?

In Junos OS, the default route preference for a static route is 5. Route preference values are used to determine which route should be installed in the routing table when multiple routes to the same destination are available.
Step-by-Step Breakdown:
Static Route Preference:
A static route, by default, has a preference of 5, making it a highly preferred route. Lower preference values are more preferred in Junos, meaning static routes take precedence over most dynamic routing protocol routes, such as OSPF (preference 10) or BGP (preference 170).
Route Preference:
Route preference is a key factor in the Junos routing decision process. Routes with lower preference values are preferred and installed in the forwarding table.
Juniper Reference:
Static Routes: In Junos, the default preference for static routes is 5, making them more preferred than most dynamic routes.

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Pass Juniper JN0-281 Exam With Practice Test Questions Dumps Bundle [Q49-Q67]

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