NEW QUESTION NO: 5
Click the exhibit button.
[edit protocols pim]
user@R1# show
rp {
bootstrap {
family inet {
priority 250;
}
}
local {
address 10.220.1.1;
priority 1;
group-ranges {
224.1.1.11/32;
224.0.0.0/4;
}
}
}
interface all;
interface fxp0.0 {
disable;
}
[edit protocols pim]
user@R4# show
rp {
bootstrap {
family inet {
priority 249;
}
}
local {
address 10.220.1.4;
priority 5;
group-ranges {
224.1.1.12/32;
224.0.0.0/4;
}
}
}
interface all;
interface fxp0.0 {
disable;
}
Referring to the exhibit, which router will be the RP?
A. R4 for all groups
B. R1 for group 224.1.1.11 and R4 for all other groups
C. R1 for all groups
D. R4 for group 224.1.1.12 and R1 for all other groups
Answer: A
Explanation/Reference:
A priority of 1 means the routing device has the least chance of becoming a designated router. Here R1 has priority 1, while R4 has priority 5. R4 will be elected the designated router and the rendezvous point (RP) for both address ranges.
Note: In a shared tree, the root of the distribution tree is a router, not a host, and is located somewhere in the core of the network. In the primary sparse mode multicast routing protocol, Protocol Independent Multicast sparse mode (PIM SM), the core router at the root of the shared tree is the rendezvous point (RP).
References: http://www.juniper.net/documentation/en_US/junos15.1/topics/example/ospf-designated- router-election-configuring.html

NEW QUESTION NO: 6
Which routing instance type is used with a Layer 3 VPN?
A. 12vpn
B. virtual-switch
C. vrf
D. vpls
Answer: C
Explanation/Reference:
Use the VPN routing and forwarding routing (VRF) instance type for Layer 3 VPN implementations.
References: https://www.juniper.net/documentation/en_US/junos15.1/topics/concept/routing-instances- overview.html

NEW QUESTION NO: 7
What are two characteristics of L3VPNs? (Choose two.)
A. Matching route targets are required for L3VPNs to function correctly.
B. Multiprotocol BGP is required for L3VPNs to function correctly.
C. The IPv4 NLRI is required for L3 VPNs to function correctly.
D. Matching route distinguishers are required for L3VPNs to function correctly.
Answer: A,D
Explanation/Reference:
D: When customer networks that use private addresses connect to the Internet infrastructure, the private addresses might overlap with the same private addresses used by other network users. MPLS/BGP VPNs solve this problem by adding a route distinguisher.
A: The PE router uses the route target to constrain the import of remote routes into its VRF tables.
Incorrect Answers:
B: Multiprotocol BGP is not required for L3VPNs.
Note: Multiprotocol Extensions for BGP (MBGP), sometimes referred to as Multiprotocol BGP or Multicast BGP and defined in IETF RFC 4760, is an extension to Border Gateway Protocol (BGP) that allows different types of addresses (known as address families) to be distributed in parallel.
In Junos OS, Layer 3 VPNs are based on RFC 4364. RFC 4364 VPNs are also known as BGP/MPLS VPNs because BGP is used to distribute VPN routing information across the provider's backbone, and MPLS is used to forward VPN traffic across the backbone to remote VPN sites.
References: http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/layer-3-vpn- overview.html

NEW QUESTION NO: 8
Click the Exhibit button.

As a network administrator, you are asked to configure the VPN-B routing instance so that P routers are masked in CE2-to-CE5 trace routes. For the VPN-A routing instance, P routers should appear in CE1-to- CE4 trace routes.
Referring to the exhibit, which two actions achieve this task? (Choose two.)
A. Add the no-vrf-propagate-ttl statement to the VPN-B routing instance on PE1.
B. Add the no-vrf-propagate-ttl statement on egress router PE2.
C. Add the no-vrf-propagate-ttl statement on transit router P.
D. Add the no-vrf-propagate-ttl statement to the VPN-B routing instance on PE2.
Answer: A,C
Explanation/Reference:
You do not need to include the no-vrf-propagate-ttl statement on the egress router (PE2).
References: Junos OS, Layer 3 VPNs Configuration Guide, page 208

NEW QUESTION NO: 9
An L2VPN (draft-kompella-mpls-l2vpn) is established between two PE routers to provide connectivity between two customer sites.
Which two statements related to this deployment are true? (Choose two.)
A. BGP must be used for the control plane communications.
B. Kompella encapsulation is used in the data plane communications.
C. LDP must be used for the control plane communications.
D. Martini encapsulation is used in the data plane communications.
Answer: A,B
Explanation/Reference:
Junos OS substantially supports t RFC 4447, Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP).
Martini uses directed LDP to signal the VPN label between the PE devices, Kompella uses BGP to signal the VPN label between the PE devices.
References: https://www.juniper.net/documentation/en_US/junos15.1/topics/reference/standards/layer-2- circuit.html

NEW QUESTION NO: 10
Which command will match communities 101:111, 111:1, and 999:1111?
A. set policy-options comminity COMMUNITY members ''^... :1?''
B. set policy-options community COMMUNITY members ''^1.*:1+''
C. set policy-options community COMMUNITY members [''^1.1:1?'' 999:1111]
D. set policy-options community COMMUNITY members ''^... :1+''
Answer: D
Explanation/Reference:
Period (.)-A wildcard character that matches any single digit in an AS number.
+ stands for one or more repetitions of term.
? stands for zero or one repetition of term.
References: http://www.juniper.net/documentation/en_US/junos15.1/topics/usage-guidelines/policy- defining-bgp-communities-and-extended-communities-for-use-in-routing-policy-match-conditions.html#id-
10243437

NEW QUESTION NO: 11
A PE provides VLAN VPLS service to a CE attached with two links. You want to prevent Layer 2 loops and provide link redundancy.
Which two actions will accomplish this task? (Choose two.)
A. Place both interfaces in a link aggregation group.
B. Configure different VLANs on each interface.
C. Configure all VLANs on both interfaces, on the PE, and on the CE.
D. Configure Spanning Tree Protocol between the PE and the CE.
Answer: B,D
Explanation/Reference:
D: To prevent the formation of Layer 2 loops between the CE devices and the multihomed PE routers, Juniper recommends that you employ the Spanning Tree Protocol (STP) on your CE devices. Layer 2 loops can form due to incorrect configuration. Temporary Layer 2 loops can also form during convergence after a change in the network topology.
References: http://www.juniper.net/documentation/en_US/junos16.1/topics/topic-map/vpls-bgp- multihoming.html

NEW QUESTION NO: 12
Click the Exhibit button.

You are using PIM-SM in your network and want to ensure that all available equal-cost paths are being used for multicast traffic.
Referring to the exhibit, where must you configure the PIM join-load-balance parameter to achieve this goal?
A. R2, R4, and R5
B. R1, R2, R4, and R5
C. R4
D. R4 and R5
Answer: D
Explanation/Reference:
Incorrect Answers:
A, B: R2 is the RP. You configure PIM join load balancing on the non-RP routers in the PIM domain.
References: http://www.juniper.net/documentation/en_US/junos15.1/topics/task/configuration/mcast-pim- join-load-balance.html

NEW QUESTION NO: 13
What are two characteristics of L2 circuits? (Choose two.)
A. Routing instance configuration is required for L2 circuits to function correctly.
B. Routing instance configuration is not required for L2 circuits to function correctly.
C. BGP is required for L2 circuits to function correctly.
D. BGP is not required for L2 circuits to function correctly.
Answer: B,D
Explanation/Reference:
B: You configure Layer 2 VPNs in a routing instance. As a result, Layer 2 VPNs have unique site and VPN identifiers. However, Layer 2 circuits do not require a routing instance configuration and instead use an alternate method of identifying circuits.
D: Layer 2 VPNs, like Layer 3 VPNs, require Border Gateway Protocol (BGP) for transport of traffic between PE routers. In contrast, Layer 2 circuits do not require BGP. Instead, Layer 2 circuits rely on LDP and MPLS for their operation.
References: http://www.juniper.net/techpubs/en_US/junos12.3/topics/concept/layer-two-circuits-overview- solutions.html

NEW QUESTION NO: 14
Which two statements are true regarding the CSPF algorithm? (Choose two.)
A. The selected path for a given LSP is passed to the TED in the form of an ERO.
B. LSPs with lower numerical setup priorities are computed before LSPs with higher setup priority values.
C. The selected path for a given LSP is passed to RSVP in the form of an ERO.
D. LSPs with higher numerical setup priorities are computed before LSPs with lower setup priority values.
Answer: B,C
Explanation/Reference:
The CSPF algorithm first calculates the highest-priority LSP (the one with the lowest setup priority value).
Do I need to enable CSPF to control where to send my traffic? The answer is no. You can manually configure an Explicit Route Objects (ERO) list, and let RSVP doing the job. In the presence of the ERO object, the RSVP Path messages will follow the path specified, thus the Resv messages carrying the labels in the opposite direction.
References: https://www.netflask.net/jnpr-constrained-shortest-path-first/

NEW QUESTION NO: 15
Click the Exhibit button.
R1 is exporting 2000:FEFE:100::/64 to R2 over the EBGP peering session as shown in the exhibit.


What will R1 use for this route's protocol next hop when advertising it to R2?
A. 2000:FEFE:89::1
B. 172.16.1.1
C. 10.1.1.1
D. ::FFFF:172.16.1.1
Answer: B
Explanation/Reference:
When a BGP router reports itself as the next hop, whether because of an explicit neighbor next-hop-self configuration or implicitly as a result of participating in an EBGP session, BGP allocates a new in label and adds an entry to the MPLS forwarding table, creating a label-to-next-hop mapping.
Note: When a BGP router does not report itself as the next hop, whether because of an explicit neighbor next-hop-unchanged configuration or implicitly as a result of a participating in an IBGP session, BGP does not allocate a new in label. Instead, if the route is advertised as a labeled route, BGP uses the existing out label. This feature is used mainly on route reflectors.
References: https://www.juniper.net/techpubs/en_US/junose16.1/topics/concept/mbgp-bgp-next-hop-self- overview.html