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Exam Code: JN0-643
Exam Name: Juniper (Enterprise Routing and Switching, Professional (JNCIP-ENT))
Free One year updates to match real exam scenarios, 100% pass and refund Warranty.
Total Q&A: 103 Questions and Answers
Last Update: 2014-01-02

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NO.1 Which protocol reachability is advertised by OSPFv2?
A. IPv4
B. IPv5
C. IPv6
D. ISO
Answer: D

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NO.2 A user complains about connectivity problems from their IP address (10.1.1.87) to a server
(10.65.1.100).
Which Junos command can help verify connectivity in the network?
A. mroute
B. traceoptions
C. ping
D. clear bgp neighbor
Answer: A

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NO.3 Which option is a valid IPv6 multicast address?
A. fe80::205:8640:471:3200/ 64
B. ::172.16.0.5 /126
C. ff03:365:ba::23
D. ff01:cgfc:345::226:8ff:fee4:bf6f
Answer: C

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NO.4 Port authentication falls back to Captive Portal.
In which two scenarios would the port authentication move back to 802.1X? (Choose two.)
A. if any MAC RADIUS request packet is received on the interface and if there are no sessions in
authenticated/authenticating state
B. if Captive Portal is deactivated on the interface
C. if the user gets logged out
D. if the EAP packet is received on the interface and if there are no sessions in
authenticated/authenticating state
Answer: B,D

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NO.5 A network routes IPv4 traffic only. You want to add IPv6 to the network, but you must use a
single IGP for both IPv4 and IPv6 traffic.
Which protocol meets this requirement?
A. OSPFv2
B. BGPv4
C. ES-ISv1
D. OSPFv3
Answer: D

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NO.6 You are AS 6573.
Which AS path regular expression matches only routes originated in your AS?
A. "6573.*"
B. ".*"
C. "{"
D. "

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Exam Code: JN0-643
Exam Name: Juniper (Enterprise Routing and Switching, Professional (JNCIP-ENT))
Free One year updates to match real exam scenarios, 100% pass and refund Warranty.
Total Q&A: 114 Questions and Answers
Last Update: 2013-10-25

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NO.1 Click the Exhibit button.
Based on the configuration in the exhibit, why are you seeing drops in the best-effort queue on the SRX
Series platform.?
A. The drop-profile fill level is set too low.
B. Packets are dropped by a firewall policy.
C. The best-effort queue is being shaped.
D. The scheduler is not being applied correctly.
Answer: C

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NO.2 Click the Exhibit button.
A user on port ge-0/0/12 fails an 802.1x authentication attempt.
What is the next action of Switch A?
A. It puts the Authenticator in the HELD status where all EAPOL packets are discarded until the default
hold timer expires.
B. It communicates with the RADIUS server to confirm the user's password.
C. It transmits an EAP-Identity-Request packet immediately after it sends out EAP-Failure.
D. It tries to authenticate the user using MAC radius authentication.
Answer: C

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NO.3 What is the default LLDP timeout?
A. 60 seconds
B. 90 seconds
C. 120 seconds
D. infinite
Answer: C

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NO.4 Port authentication falls back to Captive Portal. In which two scenarios would the port
authentication move back to 802.1X? (Choose two.)
A. if any MAC RADIUS request packet is received on the interface and if there are no sessions in
authenticated/authenticating state
B. if Captive Portal is deactivated on the interface
C. if the user gets logged out
D. if the EAP packet is received on the interface and if there are no sessions in
authenticated/authenticating state
Answer: B,D

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NO.5 A user complains about connectivity problems from their IP address (10.1.1.87) to a server
(10.65.1.100).Which Junos command can help verify connectivity in the network? (Choose two.)
A. mroute
B. traceoptions
C. ping
D. clear bgp neighbor
Answer: B,C

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NO.6 Click the Exhibit button.
The exhibit shows the output of an OSPF router LSA.
Which interface ID represents the router's loopback address?
A. ID 10.1.1.0
B. ID 10.0.3.4
C. ID 10.0.3.3
D. ID 10.0.2.4
Answer: B

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NO.7 A medium-sized enterprise has some devices that are 802.1X capable and some that are not. Any
device that fails authentication must be provided limited access through a VLAN called NONAUTH. How
do you provide this access?
A. Configure NONAUTH VLAN as the guest VLAN.
B. Configure NONAUTH VLAN as the server-reject VLAN.
C. Configure NONAUTH VLAN as the guest VLAN and the server-reject VLAN
D. Configure a separate VLAN for each type of user: 802.1X and non-802.1X.
Answer: C

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NO.8 Click the Exhibit button.
Referring to the output in the exhibit, why does the router prefer the path toward interface ge0/0/0.0 for the
20.0.0.0/8 route?
A. The origin is IGP.
B. The origin is unknown.
C. The AS path is longer.
D. Multihop is enabled.
Answer: A

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NO.9 Which two LSA types are only generated by an ABR router? (Choose two.)
A. ASBR summary LSA (Type 4)
B. ASBR LSA (Type 5)
C. Summary LSA (Type 3)
D. Router LSA (Type 1)
Answer: A,C

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NO.10 Click the Exhibit button.
Based on the output shown in the exhibit, which protocol is configured?
A. MSTP
B. RSTP
C. STP
D. VSTP
Answer: D

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NO.11 When 802.1X, MAC-RADIUS, and Captive Portal are enabled on an interface, which
authentication sequence occurs?
A. The authentication sequence is based on the order of the configuration.
B. If MAC-RADIUS is rejected, Captive Portal will start. If Captive portal is timed out, 802.1X will start.
C. If 802.1X times out, then MAC-RADIUS will start. If MAC-RADIUS is timed out by the RADIUS server,
then Captive Portal will start.
D. If 802.1X times out, then MAC-RADIUS will start. If MAC-RADIUS is rejected by the RADIUS server,
then Captive Portal will start.
Answer: D

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NO.12 If your WAN-edge router is multihomed to different ISPs, which two BGP attributes would you modify to
affect outbound traffic? (Choose two.)
A. MED
B. origin
C. local preference
D. community
Answer: B,C

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NO.13 Click the Exhibit button.
Host 1, Host 2, and Host 3 are connected to Switch A on interface ge-0/0/2. Host 1 and Host 2 have been
authenticated through 802.1X, however Host 3 does not have an 802.1X supplicant.
Referring to the configuration in the exhibit, how can Host 3 be authenticated?
A. secure-authentication option of HTTP or HTTPS must be configured for Captive Portal.
B. MAC RADIUS authentication must be configured for Host 3 instead of Captive Portal.
C. A new authentication-profile must be configured because 802.1X and Captive Portal cannot have the
same authentication-profile.
D. The 802.1X server failback feature must be configured for Host 3 to allow non-802.1X clients to
authenticate.
Answer: B

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NO.14 Click the Exhibit button.
In the exhibit, which statement about the ABR between Area 8 and Area 2 is true?
A. The router has connectivity to all areas.
B. The router has connectivity to Area 8 only.
C. The router has connectivity to Area 2 only.
D. The router has connectivity to all routers in Area 8 and Area 2.
Answer: D

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NO.15 Click the Exhibit button.
Based on the output shown in the exhibit, why is VSTP not working for VLAN 100?
A. No interfaces are assigned to VLAN 100.
B. Your MSTI is misconfigured.
C. RSTP is configured in addition to VSTP.
D. No native VLAN is configured.
Answer: A

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Exam Code: JN0-643

Exam Name: Juniper (Enterprise Routing and Switching, Professional (JNCIP-ENT))

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NO.1 Click the Exhibit button.
In the exhibit, which statement about the ABR between Area 8 and Area 2 is true?
A. The router has connectivity to all areas.
B. The router has connectivity to Area 8 only.
C. The router has connectivity to Area 2 only.
D. The router has connectivity to all routers in Area 8 and Area 2.
Answer: D

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NO.2 Click the Exhibit button.
Host 1, Host 2, and Host 3 are connected to Switch A on interface ge-0/0/2. Host 1 and Host 2 have been
authenticated through 802.1X, however Host 3 does not have an 802.1X supplicant.
Referring to the configuration in the exhibit, how can Host 3 be authenticated?
A. secure-authentication option of HTTP or HTTPS must be configured for Captive Portal.
B. MAC RADIUS authentication must be configured for Host 3 instead of Captive Portal.
C. A new authentication-profile must be configured because 802.1X and Captive Portal cannot have the
same authentication-profile.
D. The 802.1X server failback feature must be configured for Host 3 to allow non-802.1X clients to
authenticate.
Answer: B

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NO.3 Click the Exhibit button.
Based on the output shown in the exhibit, why is VSTP not working for VLAN 100?
A. No interfaces are assigned to VLAN 100.
B. Your MSTI is misconfigured.
C. RSTP is configured in addition to VSTP.
D. No native VLAN is configured.
Answer: A

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NO.4 What is the default LLDP timeout?
A. 60 seconds
B. 90 seconds
C. 120 seconds
D. infinite
Answer: C

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NO.5 Port authentication falls back to Captive Portal. In which two scenarios would the port
authentication move back to 802.1X? (Choose two.)
A. if any MAC RADIUS request packet is received on the interface and if there are no sessions in
authenticated/authenticating state
B. if Captive Portal is deactivated on the interface
C. if the user gets logged out
D. if the EAP packet is received on the interface and if there are no sessions in
authenticated/authenticating state
Answer: B,D

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NO.6 A user complains about connectivity problems from their IP address (10.1.1.87) to a server
(10.65.1.100).Which Junos command can help verify connectivity in the network? (Choose two.)
A. mroute
B. traceoptions
C. ping
D. clear bgp neighbor
Answer: B,C

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NO.7 When 802.1X, MAC-RADIUS, and Captive Portal are enabled on an interface, which
authentication sequence occurs?
A. The authentication sequence is based on the order of the configuration.
B. If MAC-RADIUS is rejected, Captive Portal will start. If Captive portal is timed out, 802.1X will start.
C. If 802.1X times out, then MAC-RADIUS will start. If MAC-RADIUS is timed out by the RADIUS server,
then Captive Portal will start.
D. If 802.1X times out, then MAC-RADIUS will start. If MAC-RADIUS is rejected by the RADIUS server,
then Captive Portal will start.
Answer: D

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NO.8 Click the Exhibit button.
The exhibit shows the output of an OSPF router LSA.
Which interface ID represents the router's loopback address?
A. ID 10.1.1.0
B. ID 10.0.3.4
C. ID 10.0.3.3
D. ID 10.0.2.4
Answer: B

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NO.9 Click the Exhibit button.
A user on port ge-0/0/12 fails an 802.1x authentication attempt.
What is the next action of Switch A?
A. It puts the Authenticator in the HELD status where all EAPOL packets are discarded until the default
hold timer expires.
B. It communicates with the RADIUS server to confirm the user's password.
C. It transmits an EAP-Identity-Request packet immediately after it sends out EAP-Failure.
D. It tries to authenticate the user using MAC radius authentication.
Answer: C

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NO.10 Click the Exhibit button.
Based on the output shown in the exhibit, which protocol is configured?
A. MSTP
B. RSTP
C. STP
D. VSTP
Answer: D

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NO.11 A medium-sized enterprise has some devices that are 802.1X capable and some that are not. Any
device that fails authentication must be provided limited access through a VLAN called NONAUTH. How
do you provide this access?
A. Configure NONAUTH VLAN as the guest VLAN.
B. Configure NONAUTH VLAN as the server-reject VLAN.
C. Configure NONAUTH VLAN as the guest VLAN and the server-reject VLAN
D. Configure a separate VLAN for each type of user: 802.1X and non-802.1X.
Answer: C

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NO.12 If your WAN-edge router is multihomed to different ISPs, which two BGP attributes would you modify to
affect outbound traffic? (Choose two.)
A. MED
B. origin
C. local preference
D. community
Answer: B,C

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NO.13 Click the Exhibit button.
Based on the configuration in the exhibit, why are you seeing drops in the best-effort queue on the SRX
Series platform.?
A. The drop-profile fill level is set too low.
B. Packets are dropped by a firewall policy.
C. The best-effort queue is being shaped.
D. The scheduler is not being applied correctly.
Answer: C

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NO.14 Which two LSA types are only generated by an ABR router? (Choose two.)
A. ASBR summary LSA (Type 4)
B. ASBR LSA (Type 5)
C. Summary LSA (Type 3)
D. Router LSA (Type 1)
Answer: A,C

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NO.15 Click the Exhibit button.
Referring to the output in the exhibit, why does the router prefer the path toward interface ge0/0/0.0 for the
20.0.0.0/8 route?
A. The origin is IGP.
B. The origin is unknown.
C. The AS path is longer.
D. Multihop is enabled.
Answer: A

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