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Juniper JN0-664 Exam Sample Questions

Question # 1

Which two statements are correct about a sham link? (Choose two.)

A. It creates an OSPF multihop neighborship between two PE routers.

B. It creates a BGP multihop neighborship between two PE routers.

C. The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes

D. The PEs exchange Type 3 OSPF LSAs instead of Type 1 OSPF LSAs for the L3VPN routes.

Answer

A. It creates an OSPF multihop neighborship between two PE routers.

C. The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes

Explanation:

A sham link is a logical link between two PE routers that belong to the same OSPF area but are connected through an L3VPN. A sham link makes the PE routers appear as if they are directly connected, and prevents OSPF from preferring an intra-area back door link over the VPN backbone. A sham link creates an OSPF multihop neighborship between the PE routers using TCP port 646. The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes, which allows OSPF to use the correct metric for route selection1.

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Question # 2

Which two statements are correct regarding bootstrap messages that are forwarded within a PIM sparse mode domain? (Choose two.)

A. Bootstrap messages are forwarded only to routers that explicitly requested the messages within the PIM sparse-mode domain

B. Bootstrap messages distribute RP information dynamically during an RP election.

C. Bootstrap messages are used to notify which router is the PIM RP

D. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain.

Answer

B. Bootstrap messages distribute RP information dynamically during an RP election.

D. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain.

Explanation:

Bootstrap messages are PIM messages that are used to distribute rendezvous point (RP) information dynamically during an RP election. Bootstrap messages are sent by bootstrap routers (BSRs), which are routers that are elected to perform the RP discovery function for a PIM sparse-mode domain. Bootstrap messages contain information about candidate RPs and their multicast groups, as well as BSR priority and hash mask length. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain using hop-by-hop flooding.

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Question # 3

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 # 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 three mechanisms are used by Junos platforms to evaluate incoming traffic for CoS purposes? (Choose three )

A. Rewrite rules

B. Behavior aggregate classifiers

C. Traffic shapers

D. Fixed classifiers

E. Multifield Classifiers

Answer

B. Behavior aggregate classifiers

D. Fixed classifiers

E. Multifield Classifiers

Explanation:

Junos platforms use different mechanisms to evaluate incoming traffic for CoS purposes, such as: Behavior aggregate classifiers: These classifiers use a single field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined or user-defined values.

Fixed classifiers: These classifiers use a fixed field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined values.

Multifield classifiers: These classifiers use multiple fields in a packet header to classify traffic into different forwarding classes and loss priorities based on user-defined values and filters. Rewrite rules and traffic shapers are not used to evaluate incoming traffic for CoS purposes, but rather to modify or shape outgoing traffic based on CoS policies.

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