Get Perfect Results with Premium JN0-351 Dumps Updated 67 Questions [Q32-Q54]

QUESTION 32
You are asked to create a new firewall filter to evaluate Layer 3 traffic that is being sent between VLANs. In this scenario, which two statements are correct? (Choose two.)

You should create a family Ethernet-switching firewall filter with the appropriate match criteria and actions.

You should apply the firewall filter to the appropriate VLAN.

You should create a family inet firewall filter with the appropriate match criteria and actions.

You should apply the firewall filter to the appropriate IRB interface.

Explanation
A firewall filter is a configuration that defines the rules that determine whether to forward or discard packets at specific processing points in the packet flow. A firewall filter can also modify the attributes of the packets, such as priority, marking, or logging. A firewall filter can be applied to various interfaces, protocols, or routing instances on a Juniper device1.
A firewall filter has a family attribute, which specifies the type of traffic that the filter can evaluate. The family attribute can be one of the following: inet, inet6, mpls, vpls, iso, or ethernet-switching2. The family inet firewall filter is used to evaluate IPv4 traffic, which is the most common type of Layer 3 traffic on a network.
To create a family inet firewall filter, you need to specify the appropriate match criteria and actions for each term in the filter. The match criteria can include various fields in the IPv4 header, such as source address, destination address, protocol, port number, or DSCP value. The actions can include accept, discard, reject, count, log, policer, or next term3.
To apply a firewall filter to Layer 3 traffic that is being sent between VLANs, you need to apply the filter to the appropriate IRB interface. An IRB interface is an integrated routing and bridging interface that provides Layer 3 functionality for a VLAN on a Juniper device. An IRB interface has an IP address that acts as the default gateway for the hosts in the VLAN. An IRB interface can also participate in routing protocols and forward packets to other VLANs or networks4.
Therefore, option C is correct, because you should create a family inet firewall filter with the appropriate match criteria and actions. Option D is correct, because you should apply the firewall filter to the appropriate IRB interface.
Option A is incorrect, because you should not create a family ethernet-switching firewall filter with the appropriate match criteria and actions. A family ethernet-switching firewall filter is used to evaluate Layer 2 traffic on a Juniper device. A family ethernet-switching firewall filter can only match on MAC addresses or VLAN IDs, not on IP addresses or protocols5.
Option B is incorrect, because you should not apply the firewall filter to the appropriate VLAN. A VLAN is a logical grouping of hosts that share the same broadcast domain on a Layer 2 network. A VLAN does not have an IP address or routing capability. A firewall filter cannot be applied directly to a VLAN; it must be applied to an interface that belongs to or connects to the VLAN6.
References:
1: Firewall Filters Overview 2: Configuring Firewall Filters 3: Configuring Firewall Filter Match Conditions and Actions 4: Understanding Integrated Routing and Bridging Interfaces 5: Configuring Ethernet-Switching Firewall Filters 6: Understanding VLANs

QUESTION 33
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)

AS path

MED

next hop

community

QUESTION 34
Exhibit.

Which router will become the OSPF BDR if all routers are powered on at the same time?

R4

R1

R3

R2

QUESTION 35
Exhibit

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

Peer 10.32.1.2 is configured for AS 63645.

The BGP session is not established.

The R1 is configured for AS 65400.

The routers are exchanging IPv4 routes.

QUESTION 36
What are two reasons for creating multiple areas in OSPF? (Choose two.)

to reduce the convergence time

to increase the number of adjacencies in the backbone

to increase the size of the LSDB

to reduce LSA flooding across the network

QUESTION 37
Which two types of tunnels are able to be created on all Junos devices? (Choose two.)

STP

GRE

IP-IP

IPsec

QUESTION 38
A new network requires multiple topology support. You decide to use IS-IS in this situation. Which three protocol topologies are supported in this scenario? (Choose three.)

IPsec

anycast

IPv6

multicast

IPv4

QUESTION 39
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)

MTU is not at least 1492 bytes.

IP subnets are not a /30 address.

The Level 2 routers have mismatched areas.

The lo0 interface is not included as an IS-IS interface.

QUESTION 40
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

Redundant trunk groups use spanning tree to provide loop-free redundant uplinks.

Redundant trunk groups load balance traffic across two designated uplink interfaces.

Layer 2 control traffic is permitted on the secondary link.

If the active link fails, then the secondary link automatically takes over.

QUESTION 41
Exhibit.

You are using OSPF to advertise the subnets that are used by the Denver and Dallas offices. The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets.
Referring to the exhibit, which two statements are correct? (Choose two.)

Create static routes on the switches using the local vMX router’s loopback interface for the next hop.

Configure and apply a routing policy that redistributes the Dallas and Denver subnets using Type 5 LSAs.

Configure and apply a routing policy that redistributes the connected Dallas and Denver subnets.

Enable the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets.

QUESTION 42
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

Redundant trunk groups load-balance traffic across two designated uplink interfaces.

If the active link fails, then the secondary link automatically takes over.

Layer 2 control traffic is permitted on the secondary link

Redundant trunk groups must be connected to the same aggregation switch.

QUESTION 43
In RSTP, which three port roles are associated with the discarding state? (Choose three.)

root

backup

alternate

disabled

designated

QUESTION 44
Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems?
(Choose two.)

EBGP routers will append their AS number when advertising routes to their neighbors.

EBGP routers will only accept routes that contain their own AS number in the AS_PATH.

EBGP routers will drop routes that contain their own AS number in the AS_PATH

EBGP routers will prepend their AS number when advertising routes to their neighbors

QUESTION 45
Exhibit.

What is the management IP address of the device shown in the exhibit?

10.210.20.233

172.23.12.100

128.0.0.1

172.23.11.10

QUESTION 46
You are concerned about spoofed MAC addresses on your LAN.
Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)

dynamic ARP inspection

IP source guard

DHCP snooping

static ARP

QUESTION 47
Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)

blocking

flooding

learning

listening

QUESTION 48
Which statement is correct about controlling the routes installed by a RIB group?

An import policy is applied to the RIB group.

Only routes in the last table are installed.

A firewall filter must be configured to install routes in the RIB groups.

An export policy is applied to the RIB group.

QUESTION 49
You have two OSPF routers forming an adjacency. R1 has a priority of 32 and a router ID of 192.168.1.2. R2 has a priority of 64 and a router ID of 192.168.1.1. The routers were started at the same time and all other OSPF settings are the default settings.
Which statement is correct in this scenario?

At least three routers are required for a DR/BDR election

Router IDs must match for an adjacency to form.

R2 will be the BDR.

R1 will be the BDR.

QUESTION 50
Which two events cause a router to advertise a connected network to OSPF neighbors? (Choose two.)

When an OSPF adjacency is established.

When an interface has the OSPF passive option enabled.

When a static route to the 224.0.0.6 address is created.

When a static route to the 224.0.0.5 address is created.

QUESTION 51
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?

MED

next-hop

local preference

origin

QUESTION 52
Exhibit

You have configured a GRE tunnel. To reduce the risk of dropping traffic, you have configured a keepalive OAM probe to monitor the state of the tunnel; however, traffic drops are still occurring.
Referring to the exhibit, what is the problem?

For GRE tunnels, the OAM protocol requires that the BFD protocols also be used.

The “event link-adjacency-loss” option must be set.

LLDP needs to be removed from the gr-1/1/10.1 interface.

The hold-time value must be two times the keepalive-time value

Explanation
A keepalive OAM probe is a mechanism that can be used to monitor the state of a GRE tunnel and detect any failures in the tunnel path. A keepalive OAM probe consists of sending periodic packets from one end of the tunnel to the other and expecting a reply. If no reply is received within a specified time, the tunnel is considered down and the line protocol of the tunnel interface is changed to down1.
To configure a keepalive OAM probe for a GRE tunnel, you need to specify two parameters: the keepalive-time and the hold-time. The keepalive-time is the interval between each keepalive packet sent by the local router. The hold-time is the maximum time that the local router waits for a reply from the remote router before declaring the tunnel down2.
According to the Juniper Networks documentation, the hold-time value must be two times the keepalive-time value for a GRE tunnel2. This is because the hold-time value must account for both the round-trip time of the keepalive packet and the processing time of the remote router. If the hold-time value is too small, it may cause false positives and unnecessary tunnel flaps.
In the exhibit, the configuration shows that the keepalive-time is set to 10 seconds and the hold-time is set to
15 seconds for the gr-1/1/10.1 interface. This means that the local router will send a keepalive packet every 10 seconds and will wait for 15 seconds for a reply from the remote router. However, this hold-time value is not two times the keepalive-time value, which violates the recommended configuration. This may cause traffic drops if the remote router takes longer than 15 seconds to reply.
Therefore, option D is correct, because the hold-time value must be two times the keepalive-time value for a GRE tunnel. Option A is incorrect, because BFD is not required for GRE tunnels; BFD is another protocol that can be used to monitor tunnels, but it is not compatible with GRE keepalives3. Option B is incorrect, because the “event link-adjacency-loss” option is not related to GRE tunnels; it is an option that can be used to trigger an action when a link goes down4. Option C is incorrect, because LLDP does not need to be removed from the gr-1/1/10.1 interface; LLDP is a protocol that can be used to discover neighboring devices and their capabilities, but it does not interfere with GRE tunnels5.
References:
1: Configuring Keepalive Time and Hold time for a GRE Tunnel Interface 2: keepalive | Junos OS | Juniper Networks 3: Configuring Bidirectional Forwarding Detection 4: event link-adjacency-loss | Junos OS | Juniper Networks 5: Understanding Link Layer Discovery Protocol

QUESTION 53
You are asked to connect an IP phone and a user computer using the same interface on an EX Series switch.
The traffic from the computer does not use a VLAN tag, whereas the traffic from the IP phone uses a VLAN tag.
Which feature enables the interface to receive both types of traffic?

voice VLAN

native VLAN

MAC limiting

DHCP snooping

QUESTION 54
Which three protocols support BFD? (Choose three.)

RSTP

BGP

OSPF

LACP

FTP

Explanation
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.
According to the Juniper Networks documentation, the following protocols support BFD on Junos OS devices1:
BGP: BFD can be used to monitor the connectivity between BGP peers and trigger a session reset if a failure is detected. BFD can be configured for both internal and external BGP sessions, as well as for IPv4 and IPv6 address families2.
OSPF: BFD can be used to monitor the connectivity between OSPF neighbors and trigger a state change if a failure is detected. BFD can be configured for both OSPFv2 and OSPFv3 protocols, as well as for point-to-point and broadcast network types3.
LACP: BFD can be used to monitor the connectivity between LACP members and trigger a link state change if a failure is detected. BFD can be configured for both active and passive LACP modes, as well as for static and dynamic LAGs4.
Other protocols that support BFD on Junos OS devices are:
IS-IS: BFD can be used to monitor the connectivity between IS-IS neighbors and trigger a state change if a failure is detected. BFD can be configured for both level 1 and level 2 IS-IS adjacencies, as well as for point-to-point and broadcast network types.
RIP: BFD can be used to monitor the connectivity between RIP neighbors and trigger a route update if a failure is detected. BFD can be configured for both RIP version 1 and version 2 protocols, as well as for IPv4 and IPv6 address families.
VRRP: BFD can be used to monitor the connectivity between VRRP routers and trigger a priority change if a failure is detected. BFD can be configured for both VRRP version 2 and version 3 protocols, as well as for IPv4 and IPv6 address families.
The protocols that do not support BFD on Junos OS devices are:
RSTP: RSTP is a spanning tree protocol that provides loop prevention and rapid convergence in layer 2 networks. RSTP does not use BFD to detect link failures, but relies on its own hello mechanism that sends BPDU packets every 2 seconds by default.
FTP: FTP is an application layer protocol that is used to transfer files between hosts over a TCP connection. FTP does not use BFD to detect connection failures, but relies on TCP’s own retransmission and timeout mechanisms.
References:
1: [Configuring Bidirectional Forwarding Detection] 2: [Configuring Bidirectional Forwarding Detection for BGP] 3: [Configuring Bidirectional Forwarding Detection for OSPF] 4: [Configuring Bidirectional Forwarding Detection for Link Aggregation Control Protocol] : [Configuring Bidirectional Forwarding Detection for IS-IS] : [Configuring Bidirectional Forwarding Detection for RIP] : [Configuring Bidirectional Forwarding Detection for VRRP] : [Understanding Rapid Spanning Tree Protocol] : [Understanding FTP]

Get Perfect Results with Premium JN0-351 Dumps Updated 67 Questions [Q32-Q54]

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