JN0-664 Pre-Exam Practice Tests | (Updated 95 Questions)
Valid JN0-664 Exam Q&A PDF - One Year Free Update
The JN0-664 exam covers a wide range of topics including but not limited to, OSPF, ISIS, BGP, MPLS, LDP, L2VPN, L3VPN, RSVP, BFD, VRRP, and many more. It is a comprehensive exam that tests your understanding of the underlying technologies, as well as your ability to apply that knowledge in real-world scenarios. JN0-664 exam consists of multiple-choice questions, and you will have four hours to complete it.
NEW QUESTION # 43
Exhibit
The environment is using BGP All devices are in the same AS with reachability redundancy Referring to the exhibit, which statement is correct?
- A. Peering is dynamically discovered between all devices.
- B. Client1 is peered to Client2 and Client3.
- C. RR2 is in an OpenConfirm State until RR1 becomes unreachable.
- D. RR1 is peered to Client2 and RR2
Answer: D
Explanation:
BGP route reflectors are BGP routers that are allowed to ignore the IBGP loop avoidance rule and advertise IBGP learned routes to other IBGP peers under specific conditions. BGP route reflectors can reduce the number of IBGP sessions and updates in a network by eliminating the need for a full mesh of IBGP peers.
BGP route reflectors can have three types of peerings:
* EBGP neighbor: A BGP router that belongs to a different autonomous system (AS) than the route reflector.
* IBGP client neighbor: An IBGP router that receives reflected routes from the route reflector. A client does not need to peer with other clients or non-clients.
* IBGP non-client neighbor: An IBGP router that does not receive reflected routes from the route reflector. A non-client needs to peer with other non-clients and the route reflector.
In the exhibit, we can see that RR1 and RR2 are route reflectors in the same AS with reachability redundancy.
They have two types of peerings: EBGP neighbors (R1 and R4) and IBGP client neighbors (Client1, Client2, and Client3). RR1 and RR2 are also peered with each other as IBGP non-client neighbors.
NEW QUESTION # 44
You want to ensure that a single-area OSPF network will be loop free.
In this scenario, what are two requirements that satisfy this requirement? (Choose two.)
- A. Nodes within an area must connect in a full mesh.
- B. The Shortest Path First algorithm must prune looped paths.
- C. All nodes within an area must have the same information in their LSDBs.
- D. The DR/BDR ensures that each node within an area has the same information in their LSDBs.
Answer: B,C
Explanation:
DR/BDR doesn't ensure information sharing within the domain.
NEW QUESTION # 45
R4 is directly connected to both RPs (R2 and R3). R4 is currently sending all joins upstream to R3 but you want all joins to go to R2 instead.
Referring to the exhibit, which configuration change will solve this issue?
- A. Change the local address on R2 to be higher than R3.
- B. Change the group-range to be more specific on R2 than R3.
- C. Change the default route in inet.2 on R4 from R3 as the next hop to R2.
- D. Change the bootstrap priority on R2 to be higher than R3.
Answer: B
NEW QUESTION # 46
Referring to the exhibit. PIM-SM is configured on all routers, and Anycast-RP with Anycast-PIM is used for the discovery mechanism on RP1 and RP2. The interface metric values are shown for the OSPF area.
In this scenario, which two statements are correct about which RP is used? (Choose two.)
- A. Source2 will use RP1 and Receiver2 will use RP1 for group 224.2.2.2.
- B. Source2 will use RP2 and Receiver2 will use RP2 for group 224.2.2.2.
- C. Source1 will use RP1 and Receiver1 will use RP2 for group 224.1.1.1.
- D. Source1 will use RP1 and Receiver1 will use RP1 for group 224.1.1.1.
Answer: A,D
NEW QUESTION # 47
Which two statements are correct about the class-of-service configuration shown in the exhibit?
(Choose two.)
- A. The best-effort queue can never transmit more than 40% of the total bandwidth on the ge-0/0/0 interface, even if that bandwidth is available.
- B. Incoming traffic will not be classified because no classifier exists in the configuration.
- C. Incoming traffic will be classified using the default classifier.
- D. The best-effort queue can transmit more than 40% of the total bandwidth on the ge-0/0/0 interface, if no other queue is using that bandwidth.
Answer: C,D
NEW QUESTION # 48
You want to implement the BGP Generalized TTL Security Mechanism (GTSM) on the network.
Which three statements are correct in this scenario? (Choose three.)
- A. You can implement BGP GTSM between R2 and R1.
- B. BGP GTSM requires a TTL of 1 to be configured between neighbors.
- C. BGP GTSM requires a firewall filter to discard packets with incorrect TTL.
- D. You can implement BGP GTSM between R2, R3, and R4.
- E. BGP GTSM requires a TTL of 255 to be configured between neighbors
Answer: A,C,E
Explanation:
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/multihop- edit-protocols-bgp.html
NEW QUESTION # 49
Which origin code is preferred by BGP?
- A. External
- B. Null
- C. Internal
- D. Incomplete
Answer: D
Explanation:
BGP uses several attributes to select the best path for a destination prefix. One of these attributes is origin, which indicates how BGP learned about a route. The origin attribute can have one of three values: IGP, EGP, or Incomplete. IGP means that the route was originated by a network or aggregate statement within BGP or by redistribution from an IGP into BGP. EGP means that the route was learned from an external BGP peer (this value is obsolete since BGP version 4). Incomplete means that the route was learned by some other means, such as redistribution from a static route into BGP. BGP prefers routes with lower origin values, so Incomplete is preferred over EGP, which is preferred over IGP.
NEW QUESTION # 50
After a recent power outage, your manager asks you to investigate ways to automatically reduce the impact caused by suboptimal routing in your OSPF and OSPFv3 network after devices reboot.
Which three configuration statements accomplish this task? (Choose three.)
- A. set protocols ospf overload
- B. set protocols ospf3 overload timeout 900
- C. set protocols ospf3 overload
- D. set protocols ospf overload timeout 900
- E. set protocols ospf3 realm ipv4-unicast overload timeout 900
Answer: B,D,E
NEW QUESTION # 51
Exhibit
Which two statements about the configuration shown in the exhibit are correct? (Choose two.)
- A. This VPN connects customer sites that use different AS numbers.
- B. A Layer 2 VPN is configured.
- C. This VPN connects customer sites that use the same AS number
- D. A Layer 3 VPN is configured.
Answer: A,D
Explanation:
The configuration shown in the exhibit is for a Layer 3 VPN that connects customer sites that use different AS numbers. A Layer 3 VPN is a type of VPN that uses MPLS labels to forward packets across a provider network and BGP to exchange routing information between PE routers and CE routers. A Layer 3 VPN allows customers to use different routing protocols and AS numbers at their sites, as long as they can peer with BGP at the PE-CE interface. In this example, CE-1 is using AS 65530 and CE-2 is using AS 65531, but they can still communicate through the VPN because they have BGP sessions with PE-1 and PE-2, respectively.
NEW QUESTION # 52
Which two statements are correct about the customer interface in an LDP-signaled pseudowire? (Choose two)
- A. When the encapsulation is ethemet-ccc, tagged and untagged frames are both accepted in the data plane.
- 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 vlan-ccc or extended-vlan-ccc, the configured VLAN tag is not included in the control plane LDP advertisement
Answer: A,C
Explanation:
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:
NEW QUESTION # 53
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.)
- A. set protocols isis import summary-v6
- B. set policy-options policy-statement leak-v6 term DC-routes from route-filter 2001:db9:a:faOO::/61 exact
- C. set policy-options policy-statement leak-v6 term DC-routes then reject
- D. delete policy-options policy-statement leak-v6 term DC-routes from route-filter 2001: db9 :a: fa00 : :/6l longer
- E. delete protocols isis export summary-v6
Answer: B,D,E
Explanation:
To create a summary route for IS-IS, you need to configure a policy statement that matches the prefixes to be summarized and sets the next-hop to discard. You also need to configure a summary-address statement under the IS-IS protocol hierarchy that references the policy statement. In this case, the policy statement leak-v6 is trying to match the prefix 2001:db9:a:fa00::/61 exactly, but this prefix is not advertised by any router in the network. Therefore, no summary route is created. To fix this, you need to delete the longer keyword from the route-filter term and change the prefix length to /61 exact. This will match any prefix that falls within the /61 range. You also need to delete the export statement under protocols isis, because this will export all routes that match the policy statement to other IS-IS routers, which is not desired for a summary route.
NEW QUESTION # 54
A packet is received on an interface configured with transmission scheduling. One of the configured queues is exceeding the allocated bandwidth.
In this scenario, which two actions will be taken by default on a Junos device? (Choose two.)
- A. The exceeding queue will be considered to have positive bandwidth credit.
- B. The exceeding queue will be considered to have negative bandwidth credit.
- C. The excess traffic will use bandwidth available from other queues.
- D. The excess traffic will be discarded.
Answer: B,C
Explanation:
https://www.juniper.net/documentation/us/en/software/junos/cos-security- devices/topics/concept/cos-transmission-scheduling-security-overview.html
NEW QUESTION # 55 
Click the Exhibit button.
Referring to the exhibit, which two statements are correct regarding the output shown in the exhibit? (Choose two.)
- A. The multicast traffic is using the RPT.
- B. The multicast group is an SSM group.
- C. The multicast traffic is using the SPT.
- D. The multicast group is an ASM group.
Answer: C,D
Explanation:
In the provided exhibit, the output of the `show pim join extensive 232.1.1.1` command is shown. This command provides detailed information about the PIM join state for the specified multicast group (232.1.1.1) on the router R1. To determine the correct statements regarding the multicast traffic, let's analyze the output and the terms involved:
1. **ASM vs. SSM**:
- **ASM (Any-Source Multicast)**: In ASM, receivers are interested in receiving multicast traffic from any source sending to a particular multicast group.
- **SSM (Source-Specific Multicast)**: In SSM, receivers are interested in receiving traffic only from specific sources for a multicast group.
- **Group Address Range**:
- ASM uses the range 224.0.0.0 to 239.255.255.255.
- SSM uses the range 232.0.0.0 to 232.255.255.255.
Since the group address 232.1.1.1 falls within the SSM range (232.0.0.0/8), there might be confusion.
However, considering the flags and states in the output, it's evident that the PIM mode and source information are consistent with ASM behavior.
2. **Multicast Trees**:
- **RPT (Rendezvous Point Tree)**: Multicast traffic initially uses the RPT, where the Rendezvous Point (RP) acts as an intermediate point.
- **SPT (Shortest Path Tree)**: After the initial join via RPT, traffic can switch to SPT, which is a direct path from the source to the receiver.
3. **Output Analysis**:
- **Flags**:
- The flags `sparse, rp-tree, wildcard` indicate that the group 232.1.1.1 is currently using RPT. This is typical for ASM, where traffic initially goes through the RP.
- The flags `sparse, spt` indicate that for the source 172.16.1.2, traffic has switched to SPT, meaning it is using the shortest path from the source directly to the receivers.
**Conclusion**:
Based on the analysis:
- **A. The multicast group is an ASM group**: This statement is correct as the configuration and behavior indicate ASM operation.
- **B. The multicast traffic is using the SPT**: This statement is also correct because the flags for the source
172.16.1.2 indicate that the traffic is using the SPT.
Thus, the correct answers are:
**A. The multicast group is an ASM group.**
**B. The multicast traffic is using the SPT.**
**References**:
- Juniper Networks PIM Documentation: [PIM
Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/pim-overview.html)
- Junos OS Multicast Routing Configuration Guide: [Multicast Routing Configuration Guide](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/multicast-routing.html)
NEW QUESTION # 56 
Click the Exhibit button.
You have an EVI implemented between PE-1, PE-2, and PE-3 to allow communication between CE-1 and CE-2. CE-2 receives unicast traffic from CE-1 on both links to PE-2 and PE-3. When CE-1 sends broadcast traffic, CE-2 receives it on only one of the multihomed links.
Referring to the exhibit, which EVPN route type enables this behavior?
- A. Type 1
- B. Type 2
- C. Type 4
- D. Type 3
Answer: D
Explanation:
In the context of Ethernet VPN (EVPN) and the behavior described in the exhibit, it's essential to understand the different EVPN route types and their specific functionalities. Here, CE-2 is receiving unicast traffic on both of its multihomed links to PE-2 and PE-3, but broadcast traffic is received only on one of these links.
**Explanation of EVPN Route Types**:
1. **Type 1 (Ethernet Auto-Discovery Routes)**:
- These routes are used for auto-discovery of Ethernet segments and for advertising VLAN membership.
- They do not directly influence the behavior described in the question.
2. **Type 2 (MAC/IP Advertisement Routes)**:
- These routes are used to advertise MAC addresses and IP-to-MAC bindings within the EVPN.
- They handle unicast traffic forwarding and are crucial for populating the MAC address tables on the PE devices.
- While important, they do not explain the selective broadcast behavior.
3. **Type 3 (Inclusive Multicast Ethernet Tag Routes)**:
- These routes are used to build multicast distribution trees for delivering broadcast, unknown unicast, and multicast (BUM) traffic.
- They ensure that BUM traffic is sent only once per Ethernet segment, preventing duplicate frames from being sent to multihomed CEs.
- This aligns with the behavior described where CE-2 receives broadcast traffic on only one link to prevent duplication.
4. **Type 4 (Ethernet Segment Routes)**:
- These routes are used to advertise the presence of an Ethernet segment and are crucial for Designated Forwarder (DF) election processes in multihoming scenarios.
- While relevant to multihoming, they are not directly responsible for the selective broadcast behavior.
**Conclusion**:
The behavior described, where CE-2 receives broadcast traffic on only one of its multihomed links, is controlled by Type 3 routes. These routes are specifically designed to handle inclusive multicast and broadcast traffic efficiently in EVPN environments, ensuring that such traffic is not duplicated across multiple links to the same CE.
**References**:
- Juniper Networks EVPN Documentation: [EVPN
Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-overview.html)
- RFC 7432, BGP MPLS-Based Ethernet VPN: [RFC 7432](https://tools.ietf.org/html/rfc7432) provides detailed descriptions of EVPN route types and their functions.
- Junos OS EVPN Configuration Guide: [Junos OS EVPN Configuration
Guide](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/evpn.html)
NEW QUESTION # 57
After a recent power outage, your manager asks you to investigate ways to automatically reduce the impact caused by suboptimal routing in your OSPF and OSPFv3 network after devices reboot.
Which three configuration statements accomplish this task? (Choose three.)
- A. set protocols ospf overload
- B. set protocols ospf3 overload timeout 900
- C. set protocols ospf3 overload
- D. set protocols ospf overload timeout 900
- E. set protocols ospf3 realm ipv4-unicast overload timeout 900
Answer: B,D,E
Explanation:
To reduce the impact of suboptimal routing in OSPF and OSPFv3 after devices reboot, you can use the overload feature to prevent a router from being used as a transit router for a specified period of time. This allows the router to stabilize its routing table before forwarding traffic for other routers. To enable the overload feature, you need to do the following:
For OSPF, configure the overload statement under [edit protocols ospf] hierarchy level. You can also specify a timeout value in seconds to indicate how long the router should remain in overload state after it boots up. For example, set protocols ospf overload timeout 900 means that the router will be in overload state for 15 minutes after it boots up.
For OSPFv3, configure the overload statement under [edit protocols ospf3] hierarchy level. You can also specify a realm (ipv4-unicast or ipv6-unicast) and a timeout value in seconds to indicate how long the router should remain in overload state after it boots up for each realm. For example, set protocols ospf3 realm ipv4-unicast overload timeout 900 means that the router will be in overload state for 15 minutes after it boots up for IPv4 unicast routing.
NEW QUESTION # 58
Exhibit
A network is using IS-IS for routing.
In this scenario, why are there two TLVs shown in the exhibit?
- A. Both IPv4 and IPv6 are being used in the topology
- B. There are both narrow and wide metric devices in the topology
- C. The interface specified a metric of 100 for L2.
- D. Wide metrics have specifically been requested
Answer: B
Explanation:
TLVs are tuples of (Type, Length, Value) that can be advertised in IS-IS packets. TLVs can carry different kinds of information in the Link State Packets (LSPs). IS-IS supports both narrow and wide metrics for link costs. Narrow metrics use a single octet to encode the link cost, while wide metrics use three octets. Narrow metrics have a maximum value of 63, while wide metrics have a maximum value of 16777215. If there are both narrow and wide metric devices in the topology, IS-IS will advertise two TLVs for each link: one with the narrow metric and one with the wide metric. This allows backward compatibility with older devices that only support narrow metrics12.
NEW QUESTION # 59
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The JN0-664 exam covers a range of topics, including advanced routing protocols such as OSPF, IS-IS, BGP, and MPLS, as well as service provider-specific technologies such as LDP, RSVP, and VPLS. Candidates are also expected to have a strong understanding of network security, high availability, network automation, and network management best practices.
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