Question 1

You are attempting to configure the initial two aggregated Ethernet interfaces on a router but there are no aggregated Ethernet interfaces available.
In this scenario, which configuration will enable these interfaces on this router?
A)
B)
C)
D)

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Accepted Answer

The correct answer to your question is C. Option C. Here is why:
? Option C shows the configuration of the chassis statement, which defines the properties of the router chassis, such as the number of aggregated Ethernet
interfaces, the number of FPCs, and the number of PICs1.
? To enable aggregated Ethernet interfaces on a router, you need to specify the aggregated-devices statement under the chassis statement and set
the ethernet parameter to the desired number of interfaces2. For example, to enable two aggregated Ethernet interfaces, you can use the following configuration:
chassis { aggregated-devices { ethernet { device-count 2; } } }
? Option C shows this configuration with the device-count set to 2, which will enable two aggregated Ethernet interfaces on the router. The other options do not
show this configuration and will not enable any aggregated Ethernet interfaces on the router.
? Therefore, option C is the correct answer to your question.

Question 2

Exhibit
Your ISP is announcing a default route to both R1 and R2. You want your network routers to forward all Internet traffic through the R1 device
Which BGP attribute would you use?

Accepted Answer

The BGP attribute that you would use to forward all Internet traffic through the R1 device is the local preference1.

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The local preference is an attribute that is used within an autonomous system (AS) and exchanged between iBGP routers1. It is used to select an exit point from
the AS1. The path with the highest local preference is preferred1. By setting a higher local preference for the routes received from R1, you can make R1 the
preferred exit point for all Internet traffic1.

Question 3

Exhibit.
You want to enable redundancy for the EBGP peering between the two routers shown in the exhibit. Which three actions will you perform in this scenario? (Choose
three.)

Accepted Answer

? A is correct because you need to configure BGP multihop to enable redundancy for the EBGP peering between the two routers. BGP multihop is a feature that
allows BGP peers to establish a session over multiple hops, instead of requiring them to be directly connected1. By default, EBGP peers use a time-to-live (TTL)
value of 1 for their packets, which means that they can only reach adjacent neighbors1. However, if you configure BGP multihop with a higher TTL value, you can
allow EBGP peers to communicate over multiple routers in between1. This can provide redundancy in case of a link failure or a router failure between the EBGP
peers.
? B is correct because you need to configure loopback interface peering to enable redundancy for the EBGP peering between the two routers. Loopback interface
peering is a technique that uses loopback interfaces as the source and destination addresses for BGP sessions, instead of physical interfaces2. Loopback
interfaces are virtual interfaces that are always up andreachable as long as the router is operational2. By using loopback interface peering, you can avoid the
dependency on a single physical interface or link for the BGP session, and use multiple paths to reach the loopback address of the peer2. This can provide
redundancy and load balancing for the EBGP peering.
? C is correct because you need to configure routes for the peer loopback interface
IP addresses to enable redundancy for the EBGP peering between the two routers. Routes for the peer loopback interface IP addresses are necessary to ensure
that the routers can reach each other??s loopback addresses over multiple hops2. You can use static routes or dynamic routing protocols to advertise and learn
the routes for the peer loopback interface IP addresses2. Without these routes, the routers will not be able to establish or maintain the BGP session using their
loopback interfaces.

Question 4

Exhibit

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Your BGP neighbors, one in the USA and one in France, are not establishing a connection with each other.
Referring to the exhibit, which statement is correct?

Accepted Answer

? The exhibit shows the configuration of BFD liveness detection for BGP at the global level, which applies to all BGP neighbors by default1. However, this
configuration does not specify the session mode, which determines whether BFD uses single-hop or multihop mode to communicate with a neighbor2.
? For single-hop BGP neighbors, which are directly connected on the same subnet, the session mode can be either automatic or single-hop. For multihop
BGPneighbors, which are not directly connected and require multiple hops to reach, the session mode must be multihop2.
? Since your BGP neighbors are in different countries, they are likely to be multihop neighbors. Therefore, you need to configure the session mode as multihop for
each neighbor individually at the [edit protocols bgp group group-name neighbor address bfd-liveness-detection] hierarchy level2. For example:
protocols { bgp { group usa { neighbor 192.0.2.1 { bfd-liveness-detection { session-mode multihop; } } } group france { neighbor 198.51.100.1 { bfd-livenessdetection { session-mode multihop; } } } } }
? If you do not configure the session mode for multihop neighbors, BFD will use the
default mode of automatic, which will try to use single-hop mode and fail to establish a BFD session with the remote neighbor2. This will prevent BGP from using
BFD to detect liveliness and failover.
? Therefore, the answer B is correct, as you need to configure the BFD liveness
detection on the BGP neighbor level with the appropriate session mode for multihop neighbors.

Question 5

Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

Accepted Answer

? C is correct because Layer 2 control traffic is permitted on the secondary link of a redundant trunk group (RTG) on EX Series switches. Layer 2 control traffic
includes protocols such as LLDP, LACP, and STP, which are used to exchange information and coordinate actions between switches1. According to the Juniper
Networks documentation2, Layer 2 control traffic is allowed to pass through both the active and the secondary links of an RTG, but data traffic is only forwarded
through the active link. This allows the switches to maintain their Layer 2 adjacencies and monitor the link status on both links.
? D is correct because if the active link fails, then the secondary link automatically
takes over in an RTG on EX Series switches. An RTG consists of two trunk links: an active or primary link, and a secondary or backup link2. The active link is used
to forward data traffic, while the secondary link is in standby mode. If the active link fails or becomes unavailable, the secondary link immediately transitions to a
forwarding state and takes over the data traffic without waiting for normal STP convergence2. This provides fast recovery and redundancy for the network.

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Question 6

You want to use filter-based forwarding (FBF) on your Internet peering router to load- balance traffic to two directly connected ISPs based on the source address.
Which two statements are correct in this scenario? (Choose two.)

Accepted Answer

? Option B is correct. Filter-based forwarding (FBF), also known as Policy Based Routing (PBR), uses the forwarding routing instance type12.
? Option C is correct. Routing Information Base (RIB) groups are used to copy routes from one routing table to another34. In the context of FBF, RIB groups can
be used to copy routes from the inet.0 routing table34.
? Option A is incorrect. FBF does not use the no-forwarding routing instance type15.
? Option D is incorrect. RIB groups are not used to hide routes in the inet.0 routing table34. They are used to share or copy routes between different routing
tables34.

Question 7

Exhibit

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You are a network operator troubleshooting BGP connectivity.
Which two statements are correct about the output shown in the exhibit? (Choose two.)

Accepted Answer

Option B suggests that the BGP session is not established. This is correct because in the output, the state of the BGP session is shown as ??Idle??. In BGP, an
??Idle?? state means that the BGP session is not currently established1.
Option C suggests that R1 is configured for AS 65400. This is also correct because in the output, it??s shown that the local AS number is 654001. The local AS
number represents the Autonomous System (AS) number of the router on which you??re checking the BGP session1.

Question 8

What is the default keepalive time for BGP?

Accepted Answer

The default keepalive time for BGP is 60 seconds1. The keepalive time is the interval at which BGP sends keepalive messages to maintain the connection with its
peer1. If the keepalive message is not received within the hold time, the connection is considered lost1. By default, the hold time is three times the keepalive time,
which is 180 seconds1.

Question 9

Exhibit.
You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the
switches take longer
than expected for RSTP to converge, using the default settings.
In this scenario, which action would solve the delay in RSTP convergence?

Accepted Answer

? The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp. This command forces the switch to use the legacy STP
protocol instead of RSTP, even though the switch supports RSTP1. This means that EX-4 will not be able to take advantage of the faster convergence and
enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence2.
? The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches3. Therefore, there will be a compatibility issue
between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning
message that says ??Warning: STP version mismatch with neighbor?? when it receives a BPDU from a RSTP neighbor1.
? To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the
network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp forceversion command in configuration mode1.

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Question 10

Which two statements are correct about tunnels? (Choose two.)

Accepted Answer

A tunnel is a connection between two computer networks, in which data is sent from one network to another through an encrypted link. Tunnels are commonly
used to secure data communications between two networks or to connect two networks that use different protocols.
Option B is correct, because tunnel endpoints must have a valid route to the remote tunnel endpoint. A tunnel endpoint is the device that initiates or terminates a
tunnel connection. For a tunnel to be established, both endpoints must be able to reach each other over the underlying network. This means that they must have a
valid route to the IP address of the remote endpoint1.
Option D is correct, because tunnels add additional overhead to packet size. Tunnels work by encapsulating packets: wrapping packets inside of other packets.
This means that the original packet becomes the payload of the surrounding packet, and the surrounding packet has its own header and trailer. The header and
trailer of the surrounding packet add extra bytes to the packet size, which is called overhead. Overhead can reduce the efficiency and performance of a network,
as it consumes more bandwidth and processing power2.
Option A is incorrect, because BFD can be used to monitor tunnels. BFD is a protocol that can be used to quickly detect failures in the forwarding path between
two adjacent routers or switches. BFD can be integrated with various routing protocols and link aggregation protocols to provide faster convergence and fault
recovery. BFD can also be used to monitor the connectivity of tunnels, such as GRE, IPsec, or MPLS.
Option C is incorrect, because IP-IP tunnels are stateless. IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IPIP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels are stateless, which means that they do
not keep track of the state or status of the tunnel connection. Stateless tunnels do not require any signaling or negotiation between the endpoints, but they also do
not provide any error detection or recovery mechanisms.
References:
1: What is Tunneling? | Tunneling in Networking 2: What Is Tunnel In Networking, Its Types, And Its Benefits? : [Configuring Bidirectional Forwarding Detection] :
[IP-IP Tunneling]