Free Juniper JN0-351 Übungsprüfungen

Question #1

What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

A . 1496 bytes
B . 1480 bytes
C . 1500 bytes
D . 1476 bytes

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Question #2

Exhibit.

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

A . R4
B . R1
C . R3
D . R2

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Question #3

Which statement is correct about IP-IP tunnels?

A . IP-IP tunnels only support encapsulating IP traffic.
B . IP-IP tunnels only support encapsulating non-IP traffic.
C . The TTL in the inner packet is decremented during transit to the tunnel endpoint.
D . There are 24 bytes of overhead with IP-IP encapsulation.

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Question #4

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.)

A . You should create a family Ethernet-switching firewall filter with the appropriate match criteria and actions.
B . You should apply the firewall filter to the appropriate VLAN.
C . You should create a family inet firewall filter with the appropriate match criteria and actions.
D . You should apply the firewall filter to the appropriate IRB interface.

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Richtige Antwort: CD
CD

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.

Reference: 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 #5

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.)

A . Create static routes on the switches using the local vMX router’s loopback interface for the next hop.
B . Configure and apply a routing policy that redistributes the Dallas and Denver subnets using Type 5 LSAs.
C . Configure and apply a routing policy that redistributes the connected Dallas and Denver subnets.
D . Enable the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets.

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Question #6

Exhibit

Which command displays the output shown in the exhibit?

A . show route forwarding-table
B . show ethernet-switching table
C . show ethernet―switching table extensive
D . show route forwarding―table family ethernet-switching

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Question #7

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?

A . native VLAN
B . DHCP snooping
C . MAC limiting
D . voice VLAN

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Question #8

You are troubleshooting a BGP routing issue between your network and a customer router and are reviewing the BGP routing policies.

Which two statements are correct in this scenario? (Choose two.)

A . Export policies are applied to routes in the RIB-ln table.
B . Import policies are applied to routes in the RIB-Local table.
C . Import policies are applied after the RIB-ln table.
D . Export policies are applied after the RIB-Local table.

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