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Juniper JN0-664 Exam Sample Questions

Question # 1

Which two statements about IS-IS are correct? (Choose two.)

A. PSNPs are used to acknowledge a received LSP.

B. CSNPs are used to acknowledge a received LSP.

C. CSNPs are used to request a missing LSP.

D. PSNPs are used to request a missing LSP.

Answer

A. PSNPs are used to acknowledge a received LSP.

D. PSNPs are used to request a missing LSP.

Explanation:

Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol used to move information efficiently within a computer network. It uses a series of Protocol Data Units (PDUs) to manage the network's topology and ensure consistency across all routers in the network. Specifically, Link State PDUs (LSPs), Complete Sequence Number PDUs (CSNPs), and Partial Sequence Number PDUs (PSNPs) play crucial roles in this process.

1. PSNPs (Partial Sequence Number PDUs):

Acknowledge a received LSP: PSNPs are used to acknowledge the receipt of LSPs. When a router receives an LSP, it sends a PSNP back to the sender to confirm that the LSP has been received.

Request a missing LSP: PSNPs are also used to request missing LSPs. If a router identifies a missing LSP based on sequence numbers, it can send a PSNP to request the specific LSP from its neighbors.

2. CSNPs (Complete Sequence Number PDUs):

 Summarize LSPs: CSNPs are used to summarize all the LSPs known to a router. They are typically sent at regular intervals to provide a complete list of LSPs in a database. They are not used to acknowledge or request specific LSPs but provide an overview of all LSPs for database synchronization.

Based on this understanding, let's evaluate the statements:

A. PSNPs are used to acknowledge a received LSP.

Correct. PSNPs serve the purpose of acknowledging LSPs received from other routers.

B. CSNPs are used to acknowledge a received LSP.

Incorrect. CSNPs are not used for acknowledging LSPs; they are used to provide a summary of all LSPs.

C. CSNPs are used to request a missing LSP.

Incorrect. CSNPs are not used to request missing LSPs; this is the role of PSNPs.

D. PSNPs are used to request a missing LSP.

Correct. PSNPs are used to request specific missing LSPs when a router detects that it is missing information.

Conclusion:

The correct statements about IS-IS are:

A. PSNPs are used to acknowledge a received LSP.

D. PSNPs are used to request a missing LSP.

References:

Juniper Networks Documentation on IS-IS: [IS-IS Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/is-is-routing-overview.html)

RFC 1195, Use of OSI IS-IS for Routing in TCP/IP and Dual Environments: [RFC 1195](https://tools.ietf.org/html/rfc1195) which details the operation and use of IS-IS, including the roles of PSNPs and CSNPs.

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Question # 2

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.

Answer

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

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Question # 3

Which two statements describe PIM-SM? (Choose two)

A. Routers with receivers send join messages to their upstream neighbors.

B. Routers without receivers must periodically prune themselves from the SPT.

C. Traffic is initially flooded to all routers and an S,G is maintained for each group

D. Traffic is only forwarded to routers that request to join the distribution tree.

Answer

A. Routers with receivers send join messages to their upstream neighbors.

D. Traffic is only forwarded to routers that request to join the distribution tree.

Explanation:

PIM sparse mode (PIM-SM) is a multicast routing protocol that uses a pull model to deliver multicast traffic. In PIM-SM, routers with receivers send join messages to their upstream neighbors toward a rendezvous point (RP) or a source-specific tree (SPT). The RP or SPT acts as the root of a shared distribution tree for a multicast group. Traffic is only forwarded to routers that request to join the distribution tree by sending join messages. PIM-SM does not flood traffic to all routers or prune routers without receivers, as PIM dense mode does.

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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.

Answer

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:

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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.

Answer

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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