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Juniper JN0-643 Exam - Juniper Networks Certified Professional Enterprise Routing and Switching (JNCIP-ENT)

Questions & Answers for Juniper JN0-643

Showing 1-15 of 221 Questions

Question #1 - Topic 1

Which two statements about the voice VLAN feature are correct? (Choose two.)

A. It can be used to separate untagged data and VLAN tagged VoIP traffic into different VLANs on an access port.

B. It can be used to assign VoIP traffic into a CoS forwarding class.

C. It can be used to separate untagged data and VLAN tagged VoIP traffic into different VLANs on a trunk port.

D. It can be used to apply a policer to VoIP traffic.

Question #2 - Topic 1

-- Exhibit --
[email protected]# run show route receive-protocol bgp 192.168.4.101 detail
inet.0: 18 destinations, 20 routes (18 active, 0 holddown, 0 hidden)
* 10.16.1.0/24 (1 entry, 1 announced)
Accepted
Nexthop: 192.168.4.101
LocalpreF. 100
AS path: 123 111 I
* 10.16.2.0/24 (1 entry, 1 announced)
Accepted
Nexthop: 192.168.4.101
LocalpreF. 100
AS path: 123 222 312 I
* 10.16.3.0/24 (1 entry, 1 announced)
Accepted
Nexthop: 192.168.4.101
LocalpreF. 100
AS path: 123 231 222 I
* 10.16.4.0/24 (1 entry, 1 announced)
Accepted
Nexthop: 192.168.4.101
LocalpreF. 100
AS path: 123 333 111 I
-- Exhibit --
Click the Exhibit button.
Referring to the exhibit, which AS path regular expression will match only the 10.16.1.0/24
and 10.16.2.0/24 routes?

A. .* (222|111) .*

B. .+ (222|111) .*

C. .(222|111) .*

D. . (.222|.111) .*

Question #3 - Topic 1

-- Exhibit

-- Exhibit --
Click the Exhibit button.
A contractor needs to connect a laptop to your company network, but your company has no
wireless access and each office has only a single network port for an employee laptop. You
have an IP phone with a data port available and you have access to the switch connected
to it. You can also add the contractor's MAC address to the RADIUS server database.
Referring to the exhibit, which three commands will allow access? (Choose three.)

A. set protocols dot1x authenticator authentication-profile-name radius_profile interface ge- 0/0/16.0 mac-radius

B. set interfaces ge-0/0/16.0 family ethernet-switching port-mode trunk

C. set interfaces ge-0/0/16.0 family ethernet-switching vlan members contractor

D. set protocols dot1x authenticator authentication-profile-name radius_profile interface ge- 0/0/16.0 supplicant multiple

E. set interfaces ge-0/0/16.0 family ethernet-switching vlan members all

Question #4 - Topic 1

A security camera is connected to an EX Series switch. You are asked to ensure power to
the PoE port is maintained if the power budget is exceeded.
Which two actions will accomplish this task? (Choose two.)

A. Set the PoE management mode to static.

B. Set the PoE management mode to class.

C. Set the PoE interface priority to high.

D. Ensure the camera is connected to port ge-0/0/0.

Question #5 - Topic 1

You are asked to configure graceful restart in your network.
Which OSPF LSA type would you expect to see in the LSDB?

A. Type 8

B. Type 9

C. Type 10

D. Type 11

Question #6 - Topic 1

Which statement is true regarding OSPF multi-area adjacencies?

A. A type 3 (stub) link is advertised for a multi-area adjacency.

B. Configuring a multi-area adjacency allows the corresponding link to be considered an interarea link, so it will be less preferred over an intra-area link.

C. One logical interface will be a primary link, and the other configured as a secondary link; the secondary link will be established as an unnumbered point-to-point interface.

D. A DR and a BDR will be elected over the secondary interface, because it is not point-to- point.

Question #7 - Topic 1

Your company uses 802.1X to authenticate your users. You want to provide access to the
Internet when users cannot authenticate on the RADIUS server or when the RADIUS
server becomes unreachable.
Which two methods accomplish this goal? (Choose two.)

A. using a captive portal

B. using a server fail fallback

C. using MAC RADIUS

D. using a guest VLAN

Question #8 - Topic 1

-- Exhibit

-- Exhibit --
Click the Exhibit button.
You have implemented a firewall-based VLAN filter to map traffic from subnet
192.168.40.0/24 to a VLAN named vlan_40. However, you have not been successful in
getting the traffic mapped correctly. In addition, all traffic must be passed to the Layer 2
network.
Referring to the exhibit, which three commands are required to accomplish this behavior?
(Choose three.)

A. set interfaces ge-0/0/19.0 family ethernet-switching filter output assign_vlan

B. set interfaces ge-0/0/19.0 family ethernet-switching filter input assign_vlan

C. set vlans vlan_40 interface ge-0/0/19.0 mapping policy

D. set vlans vlan_30 interface ge-0/0/19.0 mapping policy

E. set interfaces ge-0/0/20 unit 0 family ethernet-switching port-mode trunk vlan members all

Question #9 - Topic 1

-- Exhibit

-- Exhibit --
Click the Exhibit button.
Referring to the exhibit, R2 is sending a route to R1 with a community value.
Which statement is correct?

A. Routes will be accepted without change in the attributes.

B. All routes will be rejected.

C. Routes will be accepted with the community value removed.

D. Routes will be rejected with the community value removed.

Question #10 - Topic 1

An emergency Class 3 IP phone is connected to an EX Series switch. You want to ensure
that the IP phone does not have any problems if PoE power demands on the switch are
greater than the PoE power budget.
What should you do to accomplish this task?

A. You must connect the IP phone into one of the ports from ge-0/0/0 to ge-0/0/7.

B. Set the power class on the PoE interface to 3.

C. Set the PoE priority to high.

D. Enable the guard-band parameter.

Question #11 - Topic 1

Which statement is true regarding the SPF algorithm?

A. The SPF algorithm is run on a per-domain basis.

B. If you apply an import policy to OSPF, it keeps LSAs from being flooded, and the SPF calculation can be affected.

C. There are two databases used in the calculation, the link-state database and the tree database.

D. The SPF calculation is run on a per-area basis on each router.

Question #12 - Topic 1

-- Exhibit --
{master:0}[edit]
[email protected]# show vlans
v1 {
vlan-id 1;
interface {
ge-0/0/1.0;
v2 {
vlan-id 2;
interface {
ge-0/0/2.0;
v3 {
vlan-id 3;
interface {
ge-0/0/1.0 {
{master:0}[edit]
[email protected]# show interfaces ge-0/0/3
unit 0 {
family ethernet-switching {
port-mode trunk;
{master:0}[edit]
[email protected]# run show vlans
Name Tag Interfaces
default
None
v1 1
ge-0/0/1.0*, ge-0/0/3.0*
v2 2
ge-0/0/2.0*, ge-0/0/3.0*
v3 3
ge-0/0/1.0*, ge-0/0/3.0*
-- Exhibit --
Click the Exhibit button.
Referring to the exhibit, what would explain interface ge-0/0/3.0 being active in VLANs v1,
v2, and v3?

A. You have enabled RSTP for interface ge-0/0/3.0.

B. You have enabled MVRP for interface ge-0/0/3.0.

C. You have enabled MSTP for interface ge-0/0/3.0.

D. You have enabled L2PT for interface ge-0/0/3.0.

Question #13 - Topic 1

-- Exhibit

-- Exhibit --
Click the Exhibit button.
Referring to the exhibit, which type of LSA will be seen on router A for routes originating in
Customer A's network?

A. Type 7 LSA

B. Type 2 LSA

C. Type 5 LSA

D. Type 1 LSA

Question #14 - Topic 1

-- Exhibit

-- Exhibit --
Click the Exhibit button.
On AS1, which two attributes are used to influence inbound traffic from the other ASs
shown in the exhibit? (Choose two.)

A. AS path

B. MED

C. local preference

D. origin

Question #15 - Topic 1

A network administrator is configuring CoS on a switch and assigns forwarding classes
shown below:
class-of-service {
forwarding-classes {
class best-effort queue-num 0;
class bulk-data queue-num 1;
class critical queue-num 3;
class voice queue-num 6;
class call-signal queue-num 3;
Based on the configuration, which action prioritizes call-signal traffic over critical traffic?

A. Assign call-signal traffic and critical traffic to different schedulers.

B. Assign call-signal traffic and critical traffic to different scheduler maps.

C. Assign a loss priority of high to the packets in the critical forwarding class and set priority high in the scheduler configuration.

D. Assign a loss priority of high to the packets in the critical forwarding class and configure drop profiles in the scheduler configuration.

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