Juniper JN0-643 Online Practice Questions and Exam Preparation

Juniper JN0-643 Online Questions & Answers

• Question 161:

  Your layer two network contains 500 unique VLAN IDS .you are asked to ensure that your VLANS Are load balanced between two root bridges ,but you are only allowed to have two spanning tree instances within your network. Which spanning tree protocol should you use in the scenario?

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

• Question 162:

  -- Exhibit

  

  -- Exhibit -

  Click the Exhibit button.

  In the exhibit, R5 is receiving five 200.1.1.x routes from the RIP router, and is advertising them into Area 1 using an export policy. You want to summarize the RIP routes into Area 0 with the most specific prefix.

  Which configuration will accomplish goal?

  A. [edit protocols] user@R1# show ospf { area 0.0.0.0 { area-range 200.1.1.0/29; interface ge-0/0/1.0; interface ge-0/0/2.0; interface lo0.0; } area 0.0.0.1 { nssa { default-lsa type-7; } interface ge-0/0/3.0; } }
  B. [edit protocols] user@R1# show ospf { area 0.0.0.0 { interface ge-0/0/1.0; interface ge-0/0/2.0; interface lo0.0; } area 0.0.0.1 { nssa { default-lsa type-7; area-range 200.1.1.0/28; } interface ge-0/0/3.0; } }
  C. [edit protocols] user@R1# show ospf { area 0.0.0.0 { interface ge-0/0/1.0; interface ge-0/0/2.0; interface lo0.0; } area 0.0.0.1 { nssa { default-lsa type-7; area-range 200.1.1.0/29; } interface ge-0/0/3.0; } }
  D. [edit protocols] user@R1# show ospf { area 0.0.0.0 { area-range 200.1.1.0/28; interface ge-0/0/1.0; interface ge-0/0/2.0; interface lo0.0; } area 0.0.0.1 { nssa { default-lsa type-7; } interface ge-0/0/3.0; } }
  C. [edit protocols] user@R1# show ospf { area 0.0.0.0 { interface ge-0/0/1.0; interface ge-0/0/2.0; interface lo0.0; } area 0.0.0.1 { nssa { default-lsa type-7; area-range 200.1.1.0/29; } interface ge-0/0/3.0; } }

• Question 163:

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

• Question 164:

  Which two statements about OSPF external metrics are correct? (Choose two)

  A. Type 2 external metrics take the precedence when both metrics are present for a particular destination
  B. Type 2 external metrics use only the external cost to the destination and ignore the cost to reach the ASBR
  C. When both type 1 and type 2 external paths are available, the paths with the smallest advertise metrics are preferred
  D. Type 1 external metrics equal the external cost to the external cost to the destination plus the internal cost to reach the ASBR
  B. Type 2 external metrics use only the external cost to the destination and ignore the cost to reach the ASBR
  D. Type 1 external metrics equal the external cost to the external cost to the destination plus the internal cost to reach the ASBR

• Question 165:

  -- Exhibit -

  OSPF database, Area 0.0.0.0 Type ID Adv Rtr Seq Age Opt Cksum Len Router *10.0.3.4 10.0.3.4 0x8000000d 30 0x22 0x8d11 132 bits 0x0, link count 9 id 10.1.1.0, data 255.255.255.0, Type Stub (3) Topology count: 0, Default metriC. 1 id 10.0.4.8, data 255.255.255.252, Type Stub (3) Topology count: 0, Default metriC. 1 id 10.0.2.10, data 10.0.2.10, Type Transit (2) Topology count: 0, Default metriC. 1 id 172.16.0.6, data 172.16.0.5, Type Transit (2) Topology count: 0, Default metriC. 1 id 10.0.3.4, data 255.255.255.255, Type Stub (3) Topology count: 0, Default metriC. 0 id 10.0.9.7, data 10.0.2.18, Type PointToPoint (1) Topology count: 0, Default metriC. 65 id 10.0.2.16, data 255.255.255.252, Type Stub (3) Topology count: 0, Default metriC. 65 id 10.0.3.3, data 10.0.2.6, Type PointToPoint (1) Topology count: 0, Default metriC. 2 id 10.0.2.4, data 255.255.255.252, Type Stub (3) Topology count: 0, Default metriC. 2 Topology default (ID 0) TypE. PointToPoint, Node ID. 10.0.3.3 MetriC. 2, Bidirectional TypE. PointToPoint, Node ID. 10.0.9.7 MetriC. 65, Bidirectional TypE. Transit, Node ID. 172.16.0.6 MetriC. 1, Bidirectional TypE. Transit, Node ID. 10.0.2.10 MetriC. 1, Bidirectional -- Exhibit -

  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
  B. ID 10.0.3.4

• Question 166:

  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
  B. origin
  C. local preference

• Question 167:

  A non-802.1X printer is connected to ge-0/0/0 on an EX Series switch.

  Which configuration statement will authenticate the device against an authentication server?

  A. set protocols dot1x authenticator static 22:22:22:22:22:22 interface ge-0/0/0
  B. set protocols dot1x authenticator interface ge-0/0/0 supplicant single
  C. set protocols dot1x authenticator interface ge-0/0/0 mac-radius restrict
  D. set protocols dot1x authenticator interface ge-0/0/0 disable
  C. set protocols dot1x authenticator interface ge-0/0/0 mac-radius restrict

• Question 168:

  Referring to the exhibit, what is the probability of the traffic being dropped if interface reaches 85% OF ITS bandwidth capacity?

  

  A. 90%
  B. 95%
  C. 60%
  D. 80%
  C. 60%

• Question 169:

  -- Exhibit -

  Click the Exhibit button.

  Referring to the exhibit and based on the output below from Sw-1 and Sw-2, which statement is true?

  Sw-1> show spanning-tree mstp configuration MSTP information Context identifier : 0 Region name : juniper Revision : 1 Configuration digest : 0x9357ebb7a8d74dd5fef4f2bab50531aa

  MSTI Member VLANs 0 0-9,11-19,21-4094 1 10 2 20

  Sw-2# run show spanning-tree mstp configuration MSTP information Context identifier : 0 Region name : juniper Revision : 1 Configuration digest : 0x387b5f2ea2394b14e091f0921ee7b9a8

  MSTI Member VLANs 0 0-9,11-14,16-19,21-4094 1 10,15 2 20

  A. There will be only one MSTI 2 root bridge.
  B. There will be only one CST root bridge.
  C. Sw-1 and Sw-2 are in different MSTP regions.
  D. There will be only one CIST root bridge.
  C. Sw-1 and Sw-2 are in different MSTP regions.

• Question 170:

  -- Exhibit -

  user@router> show class-of-service scheduler-map two Scheduler map: two, Index: 56974

  Scheduler: sch-best-effort, Forwarding class: best-effort, Index: 26057 Transmit ratE. 1 percent, Rate Limit:

  exact, Buffer sizE. remainder, Buffer Limit: exact, Priority: low Excess Priority: unspecified

  Drop profiles:

  Loss priority Protocol Index Name

  Low any 1

  Medium low any 1

  Medium high any 1

  High any 1

  Scheduler: sch-expedited-forwarding, Forwarding class:

  expedited-forwarding, Index: 10026

  Transmit ratE. 1 percent, Rate Limit: none, Buffer sizE. 1 percent, Buffer Limit: none, Priority: high Excess Priority: unspecified

  Drop profiles:

  Loss priority Protocol Index Name

  Low any 1

  Medium low any 1

  Medium high any 1

  High any 1

  user@router> show interfaces ge-0/0/1 extensive | find "CoS Information" CoS information:

  Direction : Output

  CoS transmit queue Bandwidth Buffer

  Priority Limit

  % bps % usec

  0 best-effort 1 10000000 r 0

  low exact

  1 expedited-forwarding 1 10000000 1 0

  high none

  Logical interface ge-0/0/1.823 (Index 74) (SNMP ifIndex 506) (Generation 139) Flags: SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.823 ] Encapsulation: ENET2 Traffic statistics:

  Input bytes : 1820224529

  Output bytes : 6505980

  Input packets: 1436371

  Output packets: 75905

  (... output truncated ...)

  user@router> show interfaces ge-0/0/1 extensive | find "Queue Counters" Queue counters: Queued packets Transmitted packets Dropped packets 0 best-effort 1343970 1343970 7105 1 expedited-fo 53987 53987

  2 assured-forw 0 0

  3 network-cont 0 0

  Queue number: Mapped forwarding classes

  0 best-effort

  1 expedited-forwarding

  2 assured-forwarding

  3 network-control

  Active alarms : None

  Active defects : None

  (... output truncated ...)

  -- Exhibit -

  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.
  C. The best-effort queue is being shaped.