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Exhibit R1 and R8 are not receiving each other's routes Referring to the exhibit, what are three configuration commands that would solve this problem? (Choose three.)
Exhibit A network designer would like to create a summary route as shown in the exhibit, but the configuration is not working. Which three configuration changes will create a summary route? (Choose three.)
Refer to the exhibit. Click the Exhibit button. Referring to the exhibit, you must provide VRF Internet access over a single connection for VPN-A Site 1, which connects to PE-1. Which two statements are correct in this scenario? (Choose two.)
Your organization manages a Layer 3 VPN for multiple customers To support advanced route than one BGP community on advertised VPN routes to remote PE routers. Which routing-instance configuration parameter would support this requirement?
Exhibit You want to implement the BGP Generalized TTL Security Mechanism (GTSM) on the network Which three statements are correct in this scenario? (Choose three)
Exhibit. Referring to the exhib.t, what must be changed to establish a Level 1 adjacency between routers R1 and R2?
Exhibit You are running a service provider network and must transport a customer's IPv6 traffic across your IPv4-based MPLS network using BGP You have already configured mpis ipv6-tunneling on your PE routers. Which two statements are correct about the BGP configuration in this scenario? (Choose two.)
Exhibit Referring to the exhibit, a working L3VPN exists that connects VPN-A sites CoS is configured correctly to match on the MPLS EXP bits of the LSP, but when traffic is sent from Site-1 to Site-2, PE-2 is not classifying the traffic correctly What should you do to solve the problem?
A router running IS-IS is configured with an ISO address of 49.0001.00a0.c96b.c490.00. Which part of this address is the system ID?
Your network is receiving the 203.0.113.0/24 network using EBGP from AS 64500 and AS 64501. Both of these advertisements have identical local-preference values, AS-path lengths, and BGP origin codes. You want to influence the way your AS sends traffic to the 203.0.113.0/24 network. In this scenario, which attribute would you consider next when selecting the best path?

Question 91

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You must alter class-of-service values in packets on the outbound interface of an edge router.

In this scenario, which CoS component allows you to accomplish this task?

A.
output policer
A.
output policer
Answers
B.
scheduler
B.
scheduler
Answers
C.
rewrite rules
C.
rewrite rules
Answers
D.
forwarding classes
D.
forwarding classes
Answers
Suggested answer: C

Explanation:

Class of Service (CoS) in networking is used to manage traffic by classifying, scheduling, and sometimes modifying packets to ensure network performance and Quality of Service (QoS). Different CoS components are used to achieve these goals. Let's analyze each option to determine which CoS component allows you to alter class-of-service values on the outbound interface of an edge router.

1. **Output Policer**:

- Policing is used to control the rate of traffic sent to or from a network interface. It can drop or remark traffic that exceeds a certain rate.

- Policing is not typically used to alter CoS values but to enforce traffic limits.

2. **Scheduler**:

- A scheduler is responsible for managing the order in which packets are transmitted out of an interface based on their CoS markings. It can allocate bandwidth and prioritize traffic.

- The scheduler manages how packets are queued and sent but does not alter the CoS values of packets.

3. **Rewrite Rules**:

- Rewrite rules are used to modify the CoS values of packets, such as DSCP (Differentiated Services Code Point) or 802.1p bits, as they exit an interface.

- Rewrite rules can alter the class-of-service values in the packet headers to match the desired policies of the outbound interface.

- Therefore, rewrite rules are the correct component for altering CoS values on an outbound interface.

4. **Forwarding Classes**:

- Forwarding classes are used to categorize packets into different traffic classes within a router for QoS handling.

- They help in defining how packets should be treated by the scheduler but do not directly modify the CoS values.

**Conclusion**:

To alter class-of-service values in packets on the outbound interface of an edge router, the correct CoS component to use is:

**C. rewrite rules**

**Reference**:

- Juniper Networks Documentation on CoS: [Class of Service Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/class-of-service-overview.html)

- Junos OS CoS Configuration Guide: [Rewrite Rules](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/class-of-service-rewrite-rules.html)

Question 92

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

A.
PSNPs are used to acknowledge a received LSP.
A.
PSNPs are used to acknowledge a received LSP.
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B.
CSNPs are used to acknowledge a received LSP.
B.
CSNPs are used to acknowledge a received LSP.
Answers
C.
CSNPs are used to request a missing LSP.
C.
CSNPs are used to request a missing LSP.
Answers
D.
PSNPs are used to request a missing LSP.
D.
PSNPs are used to request a missing LSP.
Answers
Suggested answer: A, D

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.**

**Reference**:

- 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.

Question 93

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Refer to the exhibit.

Click the Exhibit button.

PE-1 and PE-2 are configured with LDP-signaled pseudowires to provide connectivity between CE-1 and CE-2. You notice no connectivity exists between CE-1 and CE-2.

Referring to the exhibit, which two statements describe potential causes for this fault? (Choose two.)

A.
The VC IDs are mismatched.
A.
The VC IDs are mismatched.
Answers
B.
There is no LSP configured from PE-1 to PE-2.
B.
There is no LSP configured from PE-1 to PE-2.
Answers
C.
Interface ge-0/0/0 on PE-1 is down.
C.
Interface ge-0/0/0 on PE-1 is down.
Answers
D.
There is no LSP configured from PE-2 to PE-1.
D.
There is no LSP configured from PE-2 to PE-1.
Answers
Suggested answer: A, B

Explanation:

In the provided exhibit, PE-1 and PE-2 are configured with LDP-signaled pseudowires to provide Layer 2 connectivity between CE-1 and CE-2. The issue is that there is no connectivity between CE-1 and CE-2. Let's analyze the potential causes for this fault.

1. **LDP-Signaled Pseudowire (L2 Circuit) Configuration**:

- Pseudowires in MPLS networks use LDP (Label Distribution Protocol) to signal the virtual circuit (VC) labels between PE routers.

- For successful connectivity, the VC ID (Virtual Circuit Identifier) and LSPs (Label Switched Paths) between the PE routers must be correctly configured and operational.

2. **Analysis of the Exhibit**:

- The output shows the status of the L2 circuit connection on PE-1.

- The status (St) for the interface is `rmt Dn`, which indicates that the remote site (PE-2) is down or unreachable.

3. **Potential Causes**:

- **A. The VC IDs are mismatched**:

- Correct. If the VC IDs configured on PE-1 and PE-2 do not match, the L2 circuit cannot be established. Mismatched VC IDs prevent the pseudowire from forming correctly.

- **B. There is no LSP configured from PE-1 to PE-2**:

- Correct. LSPs are required for MPLS forwarding. If there is no LSP from PE-1 to PE-2, the LDP session cannot establish a path for the pseudowire. This results in the pseudowire being down.

- **C. Interface ge-0/0/0 on PE-1 is down**:

- Incorrect. The interface status is shown as `Up`, meaning the physical interface is operational.

- **D. There is no LSP configured from PE-2 to PE-1**:

- While this might seem like a potential issue, the specific problem of the remote site being down (`rmt Dn`) typically relates more directly to the forward path from PE-1 to PE-2 (i.e., no LSP from PE-1 to PE-2). Hence, the more accurate immediate cause is covered in Option B.

**Conclusion**:

Given the analysis, the correct statements describing potential causes for the fault are:

**A. The VC IDs are mismatched.**

**B. There is no LSP configured from PE-1 to PE-2.**

**Reference**:

- Juniper Networks Documentation on L2 Circuits: [Configuring Layer 2 Circuits](https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/layer-2-circuits-configuring.html)

- MPLS Configuration Guide: [Juniper MPLS Configuration](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/mpls-overview.html)

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