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2021 Oct JN0-660 study guide

Q91.  - (Topic 1)

Click the Exhibit button.


You work for ISP A. Customers of both ISP B and ISP C must be able to reach all of your customers, but your network must not allow transit traffic between ISP B and ISP C.

Referring to the exhibit, which two methods could you use? (Choose two.)

A. Use local preference to prefer the proper routes.

B. Use the well-known no-transit community.

C. Use policy to filter routes on AS number.

D. Use communities to identify and filter routes.

Answer: C,D


Q92.  - (Topic 3)

Click the Exhibit button.


R3 is announcing a route to R4 using EBGP, as shown in the exhibit. All routers in AS 65221 should learn this route, but it should not be announced to any other AS. What can be done to enforce this behavior?

A. R3 should add the community no-export to the route prior to announcing it.

B. R3 should add the community no-advertise to the route prior to announcing it.

C. R4 should add the community no-announce after receiving the route.

D. R4 should add the community no-advertise after receiving the route.

Answer: A


Q93.  - (Topic 3)

Refer to the exhibit.


The core scheduler-map is assigned to fe-0/l/0.

The following traffic is queued for transmission from fe-0/1/3:

✑ 40 Mbps of best-effort traffic

✑ 2 Mbps of network-control traffic

✑ 41 Mbps of expedited-forwarding traffic

✑ 30 Mbps of assured-forwarding traffic

Which queue uses the highest amount of interface bandwidth?

A. The best-effort queue

B. The expedited-forwarding queue

C. The network-control queue

D. The assured-forwarding queue

Answer: A


Q94.  - (Topic 2)

Click the Exhibit button.


Based on the output in the exhibit, which statement is correct?

A. R4 has been configured with an IS-IS export policy and is announcing external routing information.

B. R3 and R4 have an adjacency at both level 1 and level 2.

C. R3 has been configured so that it is not used for transit traffic.

D. R3 and R4 have only a level 2 adjacency.

Answer: B


Q95.  - (Topic 1)

Click the Exhibit button.

R2 is announcing the 10.200/16 network to its IS-IS neighbors. No routing policies have

been applied to R3. Referring to the exhibit, will R5 have 10.200/16 as an IS-IS route?

A. Yes; IS-IS level 2 externals are passed from level 2 to level 1 by default.

B. No; IS-IS level 2 externals are only passed to level 1 if wide-metrics-only is configured on all routers.

C. Yes; all level 2 routing information is shared throughout an IS-IS domain by default.

D. No; IS-IS does not announce routes from level 2 to level 1 unless a routing policy is applied.

Answer: D


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Q96.  - (Topic 1)

Click the Exhibit button.


Referring to the exhibit, you want to save CPU processing load on the PE3 router by preventing the reception of routes belonging to Customer B. Which Layer 3 VPN scaling mechanism provides this functionality?

A. route origin

B. route refresh

C. route reflection

D. route target filtering

Answer: D


Q97.  - (Topic 1)

Click the Exhibit button.


Customer A is complaining that routes advertised from the CE2 router are not being received on the CE1 router. The physical topology of the network is CE1-PE1-PE2-CE2. The CE1-PE1 subnet is 172.16.1.0/24. The CE2-PE2 subnet is 172.16.2.0/24. PE1's loopback is 192.168.3.1 and PE2's loopback is 192.168.4.1.Referring to the output in the exhibit, what is the problem?

A. No LSP exists between PE1 and PE2.

B. Route targets are not properly configured.

C. as-override is not configured in the VRFs.

D. family inet-vpn is not configured on the PEs.

Answer: A


Q98.  - (Topic 3)

Click the Exhibit button.


You manage an MX series router (with 100 ms buffer size per port) that includes the configuration shown in the exhibit. Traffic marked with DSCP 000011 is entering the ge- 1/0/4 interface at 102 Mbps. The traffic exits the device on the ge-1/0/5 interface. There is no other traffic transiting the router. What happens to traffic exceeding 100 Mbps?

A. Traffic exceeding 100 Mbps is forwarded.

B. Traffic exceeding 100 Mbps is buffered.

C. Traffic exceeding 100 Mbps is redirected to a rate limiter.

D. Traffic exceeding 100 Mbps is dropped.

Answer: A


Q99.  - (Topic 2)

Click the Exhibit button.


Given the existing operational network shown in the exhibit, you now want to add a remote

site for Customer B to the PE3 router. This change should not have an effect on the existing BGP sessions between the PE routers. Which Layer 3 VPN scaling mechanism allows PE3 to begin receiving Customer B routes?

A. route origin

B. route refresh

C. route reflection

D. route target filtering

Answer: B


Q100.  - (Topic 1)

Click the Exhibit button.


Referring to the exhibit, which MPLS feature was used to make the LSP the preferred path for internal routes?

A. traffic engineering bgp-igp

B. traffic engineering shortcuts

C. traffic engineering mpls-forwarding

D. install active

Answer: C