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Juniper JN0-664 Exam Sample Questions


Question # 1

In OSPF, how does a router ensure that LSAs advertised to a neighboring router are received?
A. LSA flooding guarantees that all routers will receive them successfully.
B. LSAs are sent over a TCP connection.
C. LSAs are acknowledged by the neighboring router.
D. LSAs are advertised with an acknowledgement bit.


C. LSAs are acknowledged by the neighboring router.

Explanation:

OSPF Protocol Basics:

OSPF (Open Shortest Path First) is a link-state routing protocol.

Routers exchange LSAs (Link-State Advertisements) to share topology information.

LSA Acknowledgment Mechanism:

OSPF uses a reliable mechanism to ensure LSAs are received.

When a router sends an LSA to a neighbor, it expects an acknowledgment (ACK).

If an ACK is not received within a certain period, the router will retransmit the LSA.

Acknowledgment Process:

LSAs are sent over OSPF's reliable transport, which ensures delivery through acknowledgments.

This mechanism helps to maintain consistent and up-to-date topology databases across routers.

References:

OSPF RFC 2328

Understanding OSPF Operations




Question # 2

You want to ensure that L1 IS-IS routers have only the most specific routes available from L2 IS-IS routers. Which action accomplishes this task?
A. Configure the ignore-attached-bit parameter on all L2 routers.
B. Configure all routers to allow wide metrics.
C. Configure all routers to be L1.
D. Configure the ignore-attached-bit parameter on all L1 routers


D. Configure the ignore-attached-bit parameter on all L1 routers

Explanation:

The attached bit is a flag in an IS-IS LSP that indicates whether a router is connected to another area or level (L2) of the network. By default, L2 routers set this bit when they advertise their LSPs to L1 routers, and L1 routers use this bit to select a default route to reach other areas or levels through L2 routers. However, this may result in suboptimal routing if there are multiple L2 routers with different paths to other areas or levels. To ensure that L1 routers have only the most specific routes available from L2 routers, you can configure the ignore-attached-bit parameter on all L1 routers. This makes L1 routers ignore the attached bit and install all interarea routes learned from L2 routers in their routing tables.



Question # 3

You are configuring a Layer 3 VPN between two sites. You are configuring the vrf-target target : 65100:100 statement in your routing instance. In this scenario, which two statements describe the vrf-target configuration? (Choose two.)
A. This value is used to identify BGP routes learned from the local CE device.
B. This value is used to identify BGP routes learned from the remote PE device.
C. This value is used to add a target community to BGP routes advertised to the local CE device.
D. This value is used to add a target community to BGP routes advertised to the remote PE device.


B. This value is used to identify BGP routes learned from the remote PE device.

D. This value is used to add a target community to BGP routes advertised to the remote PE device.

Explanation:

The `vrf-target` statement in a Layer 3 VPN configuration is used to control the import and export of VPN routes by attaching a target community to the routes. This helps in defining which VPN routes should be imported into or exported from a particular VRF (Virtual Routing and Forwarding) instance.

1. Understanding VRF Target

  • The `vrf-target` statement specifies the extended community attributes (route targets) that are used to control the import and export of routes in a VRF.
  • These attributes help in identifying which routes should be shared between different VRFs, particularly across different PE (Provider Edge) devices.

2. Statements Analysis
  • This value is used to identify BGP routes learned from the local CE device incorrect. The `vrf-target` attribute is not used to identify routes learned from the local CE device. It is used to manage routes between PE devices and within the provider's MPLS network.
  • This value is used to identify BGP routes learned from the remote PE device.
  • Correct. The `vrf-target` value helps in identifying which routes from remote PE devices should be imported into the local VRF. It essentially acts as a filter for importing BGP routes with matching target communities.
  • This value is used to add a target community to BGP routes advertised to the local CE device.
  • Incorrect. Routes advertised to the local CE device do not use the `vrf-target` attribute. Instead, these routes are typically managed within the local VRF routing table.
  • This value is used to add a target community to BGP routes advertised to the remote PE device.
  • Correct. When advertising routes from the local PE to remote PE devices, the `vrf-target` value is added to these routes. This target community ensures that the correct routes are shared across the VPN.

Conclusion:

The correct statements about the `vrf-target` configuration in a Layer 3 VPN scenario are:

This value is used to identify BGP routes learned from the remote PE device.

This value is used to add a target community to BGP routes advertised to the remote PE device.

References:

Juniper Networks Documentation on VRF Target: [VRF Target Configuration
(https://www.juniper.net/documentation/en_US/junos/topics/topic-map/layer-3-vpns.html)

MPLS and VPN Architectures by Ivan Pepelnjak and Jim Guichard




Question # 4

Which two statements are correct about the customer interface in an LDP-signaled pseudowire? (Choose two)
A. When the encapsulation is vlan-ccc or extended-vlan-ccc, the configured VLAN tag is not included in the control plane LDP advertisement
B. When the encapsulation is ethernet-ccc, only frames without a VLAN tag are accepted in the data plane
C. When the encapsulation is vLan-ccc or extended-vlan-ccc, the configured VLAN tag is included in the control plane LDP advertisement
D. When the encapsulation is ethemet-ccc, tagged and untagged frames are both accepted in the data plane.


C. When the encapsulation is vLan-ccc or extended-vlan-ccc, the configured VLAN tag is included in the control plane LDP advertisement

D. When the encapsulation is ethemet-ccc, tagged and untagged frames are both accepted in the data plane.

Explanation:

The customer interface in an LDP-signaled pseudowire is the interface on the PE router that connects to the CE device. An LDP-signaled pseudowire is a type of Layer 2 circuit that uses LDP to establish a point-to-point connection between two PE routers over an MPLS network. The customer interface can have different encapsulation types depending on the type of traffic that is carried over the pseudowire. The encapsulation types are ethernet-ccc, vlan-ccc, extended-vlan-ccc, atm-ccc, frame-relay-ccc, ppp-ccc, cisco-hdlc-ccc, and tcc-ccc. Depending on the encapsulation type, the customer interface can accept or reject tagged or untagged frames in the data plane, and include or exclude VLAN tags in the control plane LDP advertisement. The following table summarizes the behavior of different encapsulation types:




Question # 5

Which two statements are correct about VPLS tunnels? (Choose two.)
A. LDP-signaled VPLS tunnels only support control bit 0.
B. LDP-signaled VPLS tunnels use auto-discovery to provision sites
C. BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.
D. BGP-signaled VPLS tunnels require manual provisioning of sites.


A. LDP-signaled VPLS tunnels only support control bit 0.

C. BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.

Explanation:

https://www.juniper.net/documentation/us/en/software/nce/feature-guide-virtual-private-lan-service/topics/task/vpls-ldp-signaling-solutions.html

https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/topics/concept/vpns-configuring-vpls-routing-instances.html#id-11510150__id-11568648


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