[Jan 08, 2025] Valid JN0-664 Test Answers & Juniper JN0-664 Exam PDF
Realistic JN0-664 Exam Dumps with Accurate & Updated Questions
NEW QUESTION # 33
Exhibit
R2 is receiving the same route from R1 and R3. You must ensure that you can load balance traffic for that route.
Referring to the exhibit, which configuration change will allow load balancing?
- A. Configure the multipath multiple-as parameter under the global BGP configuration.
- B. Apply the prepend policy as an import policy under group R1.
- C. Configure the multipath parameter under the global BGP configuration.
- D. Apply the prepend policy as an import policy under group R3.
Answer: A
NEW QUESTION # 34
Which two statements are correct about VPLS tunnels? (Choose two.)
- A. BGP-signaled VPLS tunnels require manual provisioning of sites.
- B. LDP-signaled VPLS tunnels only support control bit 0.
- C. LDP-signaled VPLS tunnels use auto-discovery to provision sites.
- D. BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.
Answer: B,D
NEW QUESTION # 35
Which two statements are correct regarding bootstrap messages that are forwarded within a PIM sparse mode domain? (Choose two.)
- A. Bootstrap messages are forwarded to all routers within a 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 only to routers that explicitly requested the messages within the PIM sparse-mode domain
Answer: A,B
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.
NEW QUESTION # 36
Exhibit
You have MAC addresses moving in your EVPN environment
Referring to the exhibit, which two statements are correct about the sequence number? (Choose two)
- A. It helps the local PE to identify the latest advertisement.
- B. It is advertised using a Type 2 message
- C. It resolves conflicting MAC address ownership claims.
- D. It identifies MAC addresses that should be discarded.
Answer: A,C
Explanation:
Explanation
The sequence number is a field in the MAC mobility extended community that is used to resolve conflicting MAC address ownership claims and to help the local PE to identify the latest advertisement. The sequence number is incremented by one for every MAC address mobility event, such as when a host moves from one Ethernet segment to another segment in the EVPN network. The PE device that receives multiple MAC advertisements for the same MAC address chooses the one with the highest sequence number as the most recent and valid advertisement.
NEW QUESTION # 37
Which two statements about the output shown in the exhibit are correct? (Choose two.)
- A. The connection has not flapped since it was initiated.
- B. The PE router has the capability to pop flow labels.
- C. There has been a VLAN ID mismatch.
- D. The PE is attached to a single local site.
Answer: A,D
NEW QUESTION # 38
Exhibit
Referring to the exhibit, you must provide Internet access for VPN-A using CE-1 as the hub CE.
Which two statements are correct in this situation? (Choose two.)
- A. You must use RIB groups to leak routes between the inet. o and vpn-a. inet. o tables.
- B. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> GW-1.
- C. RIB groups are not needed to leak routes between the inet. 0 and VPN-A. inet. 0 tables,
- D. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1.
Answer: A,D
Explanation:
Explanation
To provide Internet access for VPN-A using CE-1 as the hub CE, you need to do the following:
* You must use RIB groups to leak routes between the inet.0 and vpn-a.inet.0 tables on PE-1 and CE-1.
RIB groups are routing options that allow you to import routes from one routing table into another routing table based on certain criteria. In this scenario, you need to configure RIB groups on PE-1 and CE-1 to import Internet routes from inet.0 into vpn-a.inet.0 and vice versa.
* Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1. This is because Site 2 does not have direct Internet access and needs to use CE-1 as its default gateway for Internet traffic. Site 2 sends its Internet traffic to PE-2, which forwards it to PE-1 based on VPN-A routes. PE-1 then sends it to CE-1 based on RIB group import policy. CE-1 then sends it back to PE-1 based on its default route pointing to GW-1. PE-1 then forwards it to GW-1 based on RIB group import policy again.
NEW QUESTION # 39
After adding Customer C to your Layer 3 VPN. you must ensure that PE2 is receiving VPN routes for all customers attached to PE1, as shown in the exhibit.
Which operational command displays this information?
- A. show route table inet.0
- B. show route summary
- C. show route table customer-c.inet.0
- D. show route table bgp.l3vpn.0
Answer: D
NEW QUESTION # 40
Exhibit
Which two statements about the configuration shown in the exhibit are correct? (Choose two.)
- A. A Layer 2 VPN is configured.
- B. A Layer 3 VPN is configured.
- C. This VPN connects customer sites that use different AS numbers.
- D. This VPN connects customer sites that use the same AS number
Answer: B,C
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 # 41
Which two statements are correct about reflecting inet-vpn unicast prefixes in BGP route reflection? (Choose two.)
- A. A BGP peer does not require any configuration changes to become a route reflector client.
- B. Clients add their originator ID when advertising routes to their route reflector
- C. Route reflectors do not change any existing BGP attributes by default when advertising routes.
- D. Route reflectors add their cluster ID to the AS path when readvertising client routes.
Answer: A,C
Explanation:
Explanation
Route reflection is a BGP feature that allows a router to reflect routes learned from one IBGP peer to another IBGP peer, without requiring a full-mesh IBGP topology. Route reflectors do not change any existing BGP attributes by default when advertising routes, unless explicitly configured to do so. A BGP peer does not require any configuration changes to become a route reflector client, only the route reflector needs to be configured with the client parameter under [edit protocols bgp group group-name neighbor neighbor-address] hierarchy level.
NEW QUESTION # 42
Exhibit
Which two statements about the output shown in the exhibit are correct? (Choose two.)
- A. The PE router has the capability to pop flow labels
- B. There has been a VLAN ID mismatch.
- C. The PE is attached to a single local site.
- D. The connection has not flapped since it was initiated.
Answer: A,C
Explanation:
According to 1 and 2, BGP Layer 2 VPNs use BGP to distribute endpoint provisioning information and set up pseudowires between PE devices. BGP uses the Layer 2 VPN (L2VPN) Routing Information Base (RIB) to store endpoint provisioning information, which is updated each time any Layer 2 virtual forwarding instance (VFI) is configured. The prefix and path information is stored in the L2VPN database, which allows BGP to make decisions about the best path.
In the output shown in the exhibit, we can see some information about the L2VPN RIB and the pseudowire state. Based on this information, we can infer the following statements:
* The PE is attached to a single local site. This is correct because the output shows only one local site ID (1) under the L2VPN RIB section. A local site ID is a unique identifier for a site within a VPLS domain.
If there were multiple local sites attached to the PE, we would see multiple local site IDs with different prefixes.
* The connection has not flapped since it was initiated. This is correct because the output shows that the uptime of the pseudowire is equal to its total uptime (1w6d). This means that the pseudowire has been up for one week and six days without any interruption or flap.
* There has been a VLAN ID mismatch. This is not correct because the output shows that the remote and local VLAN IDs are both 0 under the pseudowire state section. A VLAN ID mismatch occurs when the remote and local VLAN IDs are different, which can cause traffic loss or misdelivery. If there was a VLAN ID mismatch, we would see different values for the remote and local VLAN IDs.
* The PE router has the capability to pop flow labels. This is correct because the output shows that the flow label pop bit is set under the pseudowire state section. The flow label pop bit indicates that the PE router can pop (remove) the MPLS flow label from the packet before forwarding it to the CE device.
The flow label is an optional MPLS label that can be used for load balancing or traffic engineering purposes.
NEW QUESTION # 43
Which two statements are correct regarding the PIM DR in a PIM-SM domain? (Choose two.)
- A. By default. PIM DR election is performed on point-to-point links.
- B. If the DR priorities match, the router with the lowest IP address is selected as the DR.
- C. The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.
- D. The source DR sends PIM register messages from the source network to the RP.
Answer: C,D
NEW QUESTION # 44
Exhibit.
Referring to the exhibit; the 10.0.0.0/24 EBGP route is received on R5; however, the route is being hidden.
What are two solutions that will solve this problem? (Choose two.)
- A. On R4, create a policy to change the BGP next hop to 172.16.1.1 and apply it to IBGP as an export policy
- B. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy
- C. Add the internal interface prefix to the BGP routing tables.
- D. Add the external interface prefix to the IGP routing tables
Answer: B,D
Explanation:
the default behavior for iBGP is to propagate EBGP-learned prefixes without changing the next-hop. This can cause issues if the next-hop is not reachable via the IGP. One solution is to use the next-hop self command on R4, which will change the next-hop attribute to its own loopback address. This way, R5 can reach the next-hop via the IGP and install the route in its routing table.
Another solution is to add the external interface prefix (120.0.4.16/30) to the IGP routing tables of R4 and R5.
This will also make the next-hop reachable via the IGP and allow R5 to use the route. According to 2, this is a possible workaround for a pure IP network, but it may not work well for an MPLS network.
The reason why the route is being hidden is that R5 cannot reach the BGP next hop 10.0.0.1, which is the address of R1. R5 does not have a route to 10.0.0.0/24 in its routing table, and neither does R4. Therefore, R5 cannot resolve the BGP next hop and marks the route as hidden.
There are two solutions that will solve this problem:
* Option A: On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy. This way, R5 will receive the route with a next hop of 172.16.1.2, which is reachable via the IGP. This solution is also known as next-hop-self1.
* Option B: Add the external interface prefix to the IGP routing tables. This way, R4 and R5 will learn a route to 10.0.0.0/24 via the IGP and be able to resolve the BGP next hop. This solution is also known as recursive lookup2.
Option C is not correct because adding the internal interface prefix to the BGP routing tables will not help R5 reach the BGP next hop 10.0.0.1.
Option D is not correct because changing the BGP next hop to 172.16.1.1 on R4 will not help R5 either, since R5 does not have a route to 172.16.1.1 in its routing table.
References: 1: Configuring Next-Hop-Self for IBGP Peers 2: Understanding Recursive Lookup
NEW QUESTION # 45
Exhibit
You are attempting to summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500. You implement the export policy shown in the exhibit and all routes from the routing table stop being advertised.
In this scenario, which two steps would you take to summarize the route in BGP? (Choose two.)
- A. Remove the from protocol bgp command from the export policy.
- B. Add the set routing-options static route 203.0.113.123/25 discard command.
- C. Add the set protocols bgp family inet unicast add-path command to allow additional routes to the RIB tables. -
- D. Replace exact in the export policy with orlonger.
Answer: B,D
Explanation:
To summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500, you need to do the following:
Add the set routing-options static route 203.0.113.128/25 discard command. This creates a static route for the summary prefix and discards any traffic destined to it. This is necessary because BGP can only advertise routes that are present in the routing table.
Replace exact in the export policy with orlonger. This allows R8 to match and advertise any route that is equal or more specific than the summary prefix. The exact term only matches routes that are exactly equal to the summary prefix, which is not present in the routing table.
NEW QUESTION # 46
Exhibit
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 Received 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: B,D
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.
NEW QUESTION # 47
Which statement is correct about IS-IS when it performs the Dijkstra algorithm?
- A. Tuples with the lowest cost are moved from the tree database to the LSDB.
- B. When a new neighbor ID in the tree database matches a router ID in the LSDB, the neighbor ID is moved to the candidate database
- C. The local router moves its own local tuples into the candidate database
- D. The algorithm will stop processing once the tree database is empty.
Answer: C
Explanation:
IS-IS is a link-state routing protocol that uses the Dijkstra algorithm to compute the shortest paths between nodes in a network. The Dijkstra algorithm maintains three data structures: a tree database, a candidate database, and a link-state database (LSDB). The tree database contains the nodes that have been visited and their shortest distances from the source node. The candidate database contains the nodes that have not been visited yet and their tentative distances from the source node. The LSDB contains the topology information of the network, such as the links and their costs.
The Dijkstra algorithm works as follows:
The local router moves its own local tuples into the tree database. A tuple consists of a node ID, a distance, and a parent node ID. The local router's tuple has a distance of zero and no parent node.
The local router moves its neighbors' tuples into the candidate database. The neighbors' tuples have distances equal to the costs of the links to them and parent node IDs equal to the local router's node ID.
The local router selects the tuple with the lowest distance from the candidate database and moves it to the tree database. This tuple becomes the current node.
The local router updates the distances of the current node's neighbors in the candidate database by adding the current node's distance to the link costs. If a shorter distance is found, the parent node ID is also updated.
The algorithm repeats steps 3 and 4 until either the destination node is reached or the candidate database is empty.
NEW QUESTION # 48
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