Passing Guarantee Juniper JN0-661 Dumps from PassLeader JN0-661 VCE and PDF for Free (Question 31 – Question 40)

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QUESTION 31
You are asked to implement route damping on a BGP router. There are two specific requirements for your implementation:
1. damp all prefixes with a mask length equal to or greater than /24 more aggressively than routes with a mask length between /17 and /23
2. damp prefixes with a mask length between /0 and /16 less than routes with a mask length greater than /16
Which policy configuration meets the requirement?

A.    [edit policy-options]
user@router# show
policy-statement damping {
term 1 {
from {
route-filter 0.0.0.0/0 prefix-length-range /0-/16 damping minor;
route-filter 0.0.0.0/0 prefix-length-range /24-/32 damping major; }
then accept
}
}
damping major {
half-life 30;
suppress 2500;
}
damping minor {
half-life 5;
}
B.    [edit policy-options]
user@router# show
policy-statement damping {
term 1 {
from {
route-filter 0.0.0.0/0 prefix-length-range /0-/23 damping minor;
route-filter 0.0.0.0/0 prefix-length-range /24-/32 damping major; }
then accept
}
}
damping major {
half-life 30;
suppress 2500;
}
damping minor {
half-life 5;
}
C.    [edit policy-options]
user@router# show
policy-statement damping {
term 1 {
from {
route-filter 0.0.0.0/0 prefix-length-range /0-/23 damping minor;
route-filter 0.0.0.0/0 prefix-length-range /24-/32 damping major; }
then accept
}
}
damping major {
half-life 5;
}
damping minor {
half-life 30;
suppress 2500;
}
D.    [edit policy-options]
user@router# show
policy-statement damping {
term 1 {
from {
route-filter 0.0.0.0/0 prefix-length-range /0-/16 damping minor;
route-filter 0.0.0.0/0 prefix-length-range /24-/32 damping major; }
then accept
}
}
damping major {
half-life 5;
}
damping minor {
half-life 5;
suppress 2500;
}

Answer: A
Explanation:
The default half-life is 15 minutes. The default value of suppress is 3000. To aggressively damp prefixes we should increase half-life, to for example 30 minutes, and to decrease the damp we should lower the half-life, to for example 5.
Incorrect:
B, C: The intervals in the route filter should be /0-/16 and /24-/32, not /0-/23 and /24-/32.
D: We should increase half-life, not decrease it to 5.
http://www.juniper.net/documentation/en_US/junos16.1/topics/usage-guidelines/policy-using-routing-policies-to-damp-bgp-route-flapping.html

QUESTION 32
You are asked to deploy VPLS in your network as a new service for several customers, and you must identify the configuration and provisioning requirements for your customers. In this scenario, which two statements are correct? (Choose two.)

A.    CE interfaces facing the service provider must be Ethernet interfaces.
B.    VLAN IDs defined on CE interfaces must be the same on both ends unless otherwise negotiated.
C.    PE interfaces facing the core must have VPLS encapsulation enabled.
D.    CE interfaces facing the service provider must be Layer 3 interfaces.

Answer: AB
Explanation:
A: VPLS is an Ethernet-based multipoint-to-multipoint Layer 2 VPN.
B: The Ethernet interface on the first CE must use the same VLAN ID as the second CE.
Incorrect:
D: VPLS is an Ethernet-based multipoint-to-multipoint Layer 2 VPN.
https://www.juniper.net/techpubs/en_US/release-independent/nce/information-products/topic-collections/feature-guide-virtual-private-lan-service/feature-guide-virtual-private-lan-service.pdf

QUESTION 33
ISP1 has created an L3VPN to connect CE1 and CE2. The PE-CE routing protocol is OSPF.
passleader-JN0-661-dumps-331
Referring to the exhibit, which technology will allow CE1 to receive Type 1 and Type 2 LSAs from CE2?

A.    OSPF sham links
B.    RIB groups
C.    OSPF domain IDs
D.    OSPF virtual links

Answer: D
Explanation:
OSPF requires that all areas in an autonomous system (AS) must be physically connected to the backbone area (area 0). In large networks with many areas, in which direct connectivity between all areas and the backbone area is physically difficult or impossible, you can configure virtual links to connect noncontiguous areas. Virtual links use a transit area that contains two or more area border routers (ABRs) to pass network traffic from one adjacent area to another.
Incorrect:
A: You can create an intra-area link or sham link between two provider edge (PE) routing devices so that the VPN backbone is preferred over the back-door link. A back-door link is a backup link that connects customer edge (CE) devices in case the VPN backbone is unavailable. When such a backup link is available and the CE devices are in the same OSPF area, the default behavior is to prefer this backup link over the VPN backbone. This is because the backup link is considered an intra-area link, while the VPN backbone is always considered an interarea link. Intra-area links are always preferred over interarea links.
B: A RIB group is a way to have a routing protocol, in most cases, place information in multiple route tables.
C: When OSPF is used as the routing protocol on a provider edge to customer edge (PE-CE) link in a multiprotocol label switching (MPLS) VPN. PE routers mark OSPF routes with the domain attribute derived from the OSPF process number to indicate whether the route originated within the same OSPF domain or from outside it. If the OSPF process numbering is inconsistent on PE routers in the MPLS VPN, the domain-id OSPF mode command should be used to mark that the OSPF processes with different numbers belong to the same OSPF domain.
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/47866-ospfdb7.html

QUESTION 34
RP1 and RP2 are acting as PIM-SM rendezvous points (Rps) in their autonomous system.
passleader-JN0-661-dumps-341
Referring to the diagram, which purpose does the MSDP session between RP1 and RP2 serve?

A.    MSDP allows RPs in different PIM domains to advertise any active multicast receivers to each other.
B.    MSDP allows RPs in different PIM domains to advertise any active multicast sources to each other.
C.    MSDP routes are used by an RP for reverse path forwarding lookups when milticast sources exist in different autonomous systems.
D.    MSDP allows RPs in different PIM domains to form PIM neighbor relationship with each other.

Answer: B
Explanation:
The Multicast Source Discovery Protocol (MSDP) is used to connect multicast routing domains. It typically runs on the same router as the Protocol Independent Multicast (PIM) sparse-mode rendezvous point (RP). Each MSDP router establishes adjacencies with internal and external MSDP peers similar to the way BGP establishes peers. These peer routers inform each other about active sources within the domain. When they detect active sources, the routers can send PIM sparse-mode explicit join messages to the active source.
http://www.juniper.net/techpubs/en_US/junos15.1/topics/concept/multicast-msdp-overview.html

QUESTION 35
A new service provider asked you to design its IS-IS network. You determined that two distinct IS-IS areas will be required and you must now create an ISO addressing plan for the participating intermediate systems (routers). In this scenario, which two statements are correct? (Choose two.)

A.    The NET addresses can be configured on any interface.
B.    The NET addresses must be configured on the loopback interface.
C.    The system ID within the NET address must match for all intermediate systems within the same area.
D.    The system ID within the NET address must unique for all intermediate systems within the same area.

Answer: AD
Explanation:
IS-IS uses ISO network addresses. Each address identifies a point of connection to the network, such as a router interface, and is called a network service access point (NSAP). The system identifier must be unique within the network.
http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/is-is-routing-overview.html

QUESTION 36
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: AD
Explanation:
http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/layer-3-vpn-overview.html

QUESTION 37
Which routing instance type is used with a Layer 3 VPN?

A.    12vpn
B.    virtual-switch
C.    vrf
D.    vpls

Answer: C
Explanation:
https://www.juniper.net/documentation/en_US/junos15.1/topics/concept/routing-instances-overview.html

QUESTION 38
You are asked to configure PIM-SM in your network. Your implementation must allow for load sharing between redundant RPs and, should an RP failure occur, the RP failover time should be minimized. Which two configuration tasks are required in this scenario? (Choose two.)

A.    Configure MSDP peering sessions between the routers designated as RPs.
B.    Configure at least two static RPs and bundle them in an RP redundancy group under [edit protocols pim].
C.    On the routers designated as RPs, configure the shared anycast address on the loopback inteface.
D.    Configure the shared anycast address on the RPs as the primary address on the loopback interface.

Answer: BD
Explanation:
For the purposes of load balancing and redundancy, you can configure anycast RP. You can use anycast RP within a domain to provide redundancy and RP load sharing. Anycast means that multiple RP routers share the same unicast IP address.
D: On each RP router in the domain, make sure that the router’s regular loopback address is the primary address for the interface, and set the router ID.
B: On each non-RP router in the domain, configure a static RP address using the shared address.
http://www.juniper.net/techpubs/en_US/junos14.1/topics/topic-map/mcast-pim-anycast-rp.html

QUESTION 39
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.
passleader-JN0-661-dumps-391
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: AC
Explanation:
You do not need to include the no-vrf-propagate-ttl statement on the egress router (PE2).
Junos OS, Layer 3 VPNs Configuration Guide, page 208.

QUESTION 40
user@PE2# run show 12circuit connections
Layer-2 Circuit Connections:
Legend for connection status (St)
EI – – encapsulation invalid NP – – interface
h/w not present
MM – – mtu mismatch Dn – – down
EM – – encapsulation mismatch Vc-Dn – –
Virtual circuit Down
CM – – control-word mismatch UP – –
operational
VM – – vlan id mismatch CF – – Call admission
control failure
OL – – no outgoing label IB – – TDM
incompatible bitrate
NC – – intf encaps not CCC/TCC TM – – TDM
misconfiguration
BK – – Backup Connection ST – – Standby
Connection
CB – – rcvd cell-bundle size bad SP – – Static
Pseudowire
LD – – local site signaled down RS – – remote
sity standby
RD – – remote site signaled down HS – – Hot-
standby Connection
XX – – unknown
Legend for interface status
UP – – operational
Dn – – down
Neighbor: 10.10.1.1
Interface Type St Time
last up #Up trans
ge-1/1/1.6 (vc 2) rmt VM
[edit protocols 12circuit]
user@PE2# show
neighbor 10.10.1.1. {
interface ge-1/1/1.6 {
virtual-circuit-id 2;
encapsulation-type ethernet-vlan;
}
}
[edit logical-systems jpe interfaces]
user@PE2# show
ge-1/1/1 {
unit 6 {
encapsulation vlan-ccc;
vlan-id 6;
family ccc;
}
}
user@PE1# run show 12circuit connections
logical-system kpe
Layer-2 Circuit Connections:
Legend for connection status (St)
EI – – encapsulation invalid NP – – interface
h/w not present
MM – – mtu mismatch Dn – – down
EM- – encapsulation mismatch VC-Dn – –
Virtual -circuit Down
CM – – control-word mismatch Up – –
operational
VM – – vlan id mismatch CF – – Call admission
control failure
OL – – no outgoing label IB – – TDM
incompatible bitrate
NC – – intf encaps not CCC/TCC TM – – TDM
misconfiguration
BK – – Backup connection ST – – Standby
Connection
CB – – rcvd cell-bundle size bad SP – – Static
Pseudowire
LD – – local site signaled down RS – – remote
site standby
RD – – remote site signaled down HS – – Hot-
standby Connection
XX – – unknown
Legend for interface status
Up – – operational
Dn – – down
Neighbor: 10.10.1.3
Interface Type St Time
last up # Up trans
ge-1/0/1.5 (vc 2) rmt VM
[edit protocols 12circuit]
user@PE1# show
neighbor 10.11.1.1 {
interface ge-1/0/1.5 {
virtual-circuit-id 2;
encapsulation-type ethernet-vlan;
}
}
[edit interfaces]
user@PE1#
ge-1/0/1 (
unit 5 {
encapsulation vlan-ccc;
vlan-id 5;
family ccc;
}
}
An LDP Layer 2 circuit between PE1 and PE2 is not passing traffic. Both PE1 and PE2 show the circuit state as VM — vlan id mismatch. Referring to the exhibit, which action will solve this problem?

A.    Configure interfaces PE1:ge-1/0/1.5 and PE2:ge-1/1/1.6 with the output-vlan-map pop parameter.
B.    Configure interfaces PE1:ge-1/0/1.5 or PE2:ge-1/1/1.6 with the output-vlan-map swap parameter.
C.    Configure the LDP Layer 2 circuit with the no-control-word command on PE1 and PE2.
D.    Configure interfaces PE1:ge-1/0/1.5 and PE2:ge-1/1/1.6 with the output-vlan-map swap parameter.

Answer: D
Explanation:
The output-vlan-map swap parameter specifies the VLAN rewrite operation to replace a VLAN tag. The outer VLAN tag of the frame is overwritten with the user-specified VLAN tag information. We do this on both interfaces.
http://www.juniper.net/techpubs/en_US/junos15.1/topics/reference/configuration-statement/swap-edit-interfaces.html


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