Juniper JN0-643 Online Practice Questions and Exam Preparation

Juniper JN0-643 Online Questions & Answers

• Question 91:

  -- Exhibit

  

  -- Exhibit -Click the Exhibit button.

  In the exhibit, Host2 is the only host currently joining group 231.1.1.1, but S1 is still flooding the traffic to all hosts on VLAN 100.

  What feature can be configured on S1 to limit the multicast flooding of traffic to only interested hosts on VLAN 100?

  A. Multicast scoping
  B. IGMP snooping
  C. Multicast VLAN registration
  D. IGMP immediate leave
  B. IGMP snooping

• Question 92:

  -- Exhibit -

  user@switch# run show spanning-tree statistics interface ge-0/0/0

  STP interface statistics for VLAN 10 Interface BPDUs sent BPDUs received Next BPDU transmission ge-0/0/0.0 170 3 0

  STP interface statistics for VLAN 20 Interface BPDUs sent BPDUs received Next BPDU transmission ge-0/0/0.0 171 3 0 -- Exhibit -

  Click the Exhibit button.

  Based on the exhibit, which spanning-tree protocol is running on ge-0/0/0?

  A. VSTP
  B. MSTP
  C. RSTP
  D. PVST
  A. VSTP

• Question 93:

  -- Exhibit

  

  -- Exhibit -

  Click the Exhibit button.

  Referring to the exhibit, what is the correct RPF path toward the multicast source from R6?

  A. R6-R5
  B. R6-R7-R4-R5
  C. R6-R4-R5
  D. R6-R4-R3-R2-R5
  A. R6-R5

• Question 94:

  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
  B. Type 9

• Question 95:

  Which policy statement will be applied to neighbor 172.16.4.2?

  A. policy-statement all and policy -statement agg
  B. policy-statement agg
  C. policy-statement all and policy -statement atat
  D. policy-statement atat
  A. policy-statement all and policy -statement agg

• Question 96:

  Referring to the exhibit, traffic is being sent from user1 to server 1 .The traffic is being classified using IP presentence into the default forwarding class expedited forwarding on R1 R2 and R4 .however R3 has no class service configuration. What are two potential actions R3 will take on the traffic? (Choose two)

  

  A. the traffic is serviced by the best effort queue
  B. the traffic is serviced by the assured forwarding queue
  C. the traffic is serviced by the network control queue
  D. the traffic is serviced by the expedited forwarding queues
  A. the traffic is serviced by the best effort queue
  C. the traffic is serviced by the network control queue

• Question 97:

  A company's security policy does not allow outside computers or smart phones into their work areas. All company-provided computers are strictly controlled using 802.1X authentication on all of their switches. All computers obtain DHCP IP addresses from centralized servers and all switches have IP spoofing enabled. However, one of the computers was able to send IP spoofed packets.

  Why did the IP spoof feature fail to prevent the spoofed packets from being forwarded?

  A. The IP source guard database timeout was set too low.
  B. The DHCP snooping feature was not enabled on any of the switches.
  C. IP source guard does not prevent IP spoof attacks; you need to configure the Dynamic ARP Inspection feature.
  D. 802.1X feature was not enabled on the port that was directly connected to the infected computer.
  B. The DHCP snooping feature was not enabled on any of the switches.

• Question 98:

  Which multicast group is used for all PIM routers?

  A. 224.0.0.22
  B. 224.0.0.13
  C. 224.0.0.1
  D. 224.0.0.2
  B. 224.0.0.13

• Question 99:

  What is a valid router ID configuration for OSPFv3 in the Junos OS?

  A. set routing-options router-id 2001:1:2::1
  B. set protocols ospf3 router-id fe80:223:2887:ab31::1
  C. set routing-options router-id 224.1.0.1
  D. set protocols ospf3 router-id 10.8.3.9
  C. set routing-options router-id 224.1.0.1

• Question 100:

  -- Exhibit -

  ar 16 19:12:58.291474 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:12:58.291624 BGP RECV message type 1 (Open) length 59 Mar 16 19:12:58.291688 BGP RECV version 4 as 2 holdtime 90 id 192.168.2.1 parmlen 30 Mar 16 19:12:58.291752 BGP RECV MP capability AFI=1, SAFI=1 Mar 16 19:12:58.291802 BGP RECV Refresh capability, code=128 Mar 16 19:12:58.291850 BGP RECV Refresh capability, code=2 Mar 16 19:12:58.291915 BGP RECV Restart capability, code=64, time=120, flags= Mar 16 19:12:58.291969 BGP RECV 4 Byte AS-Path capability (65), as_num 2 Mar 16 19:12:58.292385 advertising receiving-speaker only capabilty to neighbor 172.14.10.2 (External AS 2) Mar 16 19:12:58.292452 bgp_senD. sending 59 bytes to 172.14.10.2 (External AS 2) Mar 16 19:12:58.292522 Mar 16 19:12:58.292522 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:12:58.292601 BGP SEND message type 1 (Open) length 59 Mar 16 19:12:58.293053 BGP SEND version 4 as 1 holdtime 90 id 192.168.2.1 parmlen 30 Mar 16 19:12:58.293124 BGP SEND MP capability AFI=1, SAFI=1 Mar 16 19:12:58.293173 BGP SEND Refresh capability, code=128 Mar 16 19:12:58.293221 BGP SEND Refresh capability, code=2 Mar 16 19:12:58.293284 BGP SEND Restart capability, code=64, time=120, flags= Mar 16 19:12:58.293336 BGP SEND 4 Byte AS-Path capability (65), as_num 1 Mar 16 19:12:58.293517 bgp_senD. sending 19 bytes to 172.14.10.2 (External AS 2) Mar 16 19:12:58.293573 Mar 16 19:12:58.293573 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:12:58.293665 BGP SEND message type 4 (KeepAlive) length 19 Mar 16 19:12:58.296781 Mar 16 19:12:58.296781 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:12:58.296897 BGP RECV message type 4 (KeepAlive) length 19 Mar 16 19:12:58.297451 bgp_senD. sending 19 bytes to 172.14.10.2 (External AS 2) Mar 16 19:12:58.297528 Mar 16 19:12:58.297528 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:12:58.297600 BGP SEND message type 4 (KeepAlive) length 19 Mar 16 19:12:58.298102 bgp_senD. sending 23 bytes to 172.14.10.2 (External AS 2) Mar 16 19:12:58.298185 Mar 16 19:12:58.298185 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:12:58.298273 BGP SEND message type 2 (Update) length 23 Mar 16 19:12:58.298322 BGP SEND End of RIB. AFI 1 SAFI 1 Mar 16 19:12:58.301834 Mar 16 19:12:58.301834 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:12:58.301957 BGP RECV message type 4 (KeepAlive) length 19 Mar 16 19:12:58.302034 bgp_read_v4_messagE. done with 172.14.10.2 (External AS 2) received 19 octets 0 updates 0 routes Mar 16 19:12:58.304594 Mar 16 19:12:58.304594 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:12:58.304702 BGP RECV message type 2 (Update) length 23 Mar 16 19:12:58.304765 BGP RECV End of RIB. AFI 1 SAFI 1 Mar 16 19:12:58.304848 bgp_read_v4_messagE. done with 172.14.10.2 (External AS 2) received 23 octets 1 update 0 routes Mar 16 19:13:22.968415 bgp_senD. sending 19 bytes to 172.14.10.2 (External AS 2) Mar 16 19:13:22.968586 Mar 16 19:13:22.968586 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:13:22.968675 BGP SEND message type 4 (KeepAlive) length 19 Mar 16 19:13:26.901339 Mar 16 19:13:26.901339 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:13:26.901464 BGP RECV message type 4 (KeepAlive) length 19 Mar 16 19:13:26.901543 bgp_read_v4_messagE. done with 172.14.10.2 (External AS 2) received 19 octets 0 updates 0 routes Mar 16 19:13:51.335927 bgp_senD. sending 19 bytes to 172.14.10.2 (External AS 2) Mar 16 19:13:51.348180 Mar 16 19:13:51.348180 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:13:51.348296 BGP SEND message type 4 (KeepAlive) length 19 Mar 16 19:13:53.844160 Mar 16 19:13:53.844160 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:13:53.844329 BGP RECV message type 4 (KeepAlive) length 19 Mar 16 19:13:53.844392 bgp_read_v4_messagE. done with 172.14.10.2 (External AS 2) received 19 octets 0 updates 0 routes -- Exhibit -Click the Exhibit button.

  Looking at the traceoptions output, what is the current keepalive timer set for in BGP?

  A. 1 second
  B. 10 seconds
  C. 30 seconds
  D. 90 seconds
  C. 30 seconds