JN0-643 Exam Questions

You must configure your access switch with more than 3000 VLANs and you want the ability to load-balance across them. Which spanning-tree approach has the least impact on control-p...

You are implementing MSTP in your network. Which three values must match on all switches within the MST region? (Choose three)

You have been asked to implement a private VLAN with two community VLANs. This private VLAN will be confined to a single switch in your Layer 2 network. This private VLAN, along wi...

During the BGP route-resolution process, the Junos OS must calculate the appropriate next-hop based on the BGP protocol next-hop attribute. Which two routing tables are checked dur...

You have a requirement for a device to provide 20 W of power over Ethernet. What meets this requirement?

R1 has an OSPF adjacency with R2 over a point-to-point link. Which three statements about the advertisements for this link in the Type 1 (Router) LSA generated by R1 are true? (Cho...

What is the significance of the multicast address range 224.0.0.1 through 224.0.0.254?

You must prioritize VoIP packets on your network. Which feature will accomplish this goal?

You notice that a number of IGMP leave group messages are passing through a BMA network and are impacting the network's performance. What would you do to resolve this issue without...

A network administrator is configuring CoS on a switch and assigns forwarding classes call-sig and critical to the same queue number per the configuration below: class-of-service {...

A Layer 2 transparent firewall separates two OSPFv3 routers. For the two OSPFv3 routers to form an adjacency, which protocol must be permitted on the firewall?

In MSTP, which two factors determine the root bridge in each region? (Choose two.)

Which two LSA types are only generated by an ABR router? (Choose two.)

Which two statements about MVRP on EX Series switches are true? (Choose two.)

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 authenticati...

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

You are setting up a new switch in your network that is using MSTP. You have configured all access ports as edge ports, and you want to make sure that the access ports can never tr...

When using PIM-SM in ASM mode, which two events trigger the creation of a shortest-path tree? (Choose two.)

A coffee shop offering free Internet service to customers wants to implement the following security policies: 1. Every customer must agree to a set of terms and conditions before a...

What is an IP multicast routing protocol?

Which version of BGP would an enterprise use to peer with an ISP?

You are setting up a new switch in your network that is using MSTP. You want to make sure that any port connected to a host starts forwarding traffic immediately. How can you meet...

You have been asked to implement 802.1X in your network and to ensure that all authorized users continue to be permitted should the RADIUS server fail. Which solution will satisfy...

How does an administrator block IGMP reports for the 239.0.0.0/8 group range?

You have been asked to implement a private VLAN with two community VLANs. This private VLAN must span multiple switches in your Layer 2 network. Which two statements about this dep...

Which configuration parameter causes a router to ignore router ID and peer ID from the BGP route selection algorithm?

If your WAN-edge router is multihomed to different ISPs, which two BGP attributes would you modify to affect outbound traffic? (Choose two.)

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...

When using PIM-SM in SSM mode, which event triggers the creation of a shortest-path tree?

Which statement regarding LLDP update messages is correct?

When 802.1X, MAC-RADIUS, and Captive Portal are enabled on an interface, which authentication sequence occurs?

You are troubleshooting a problem on interface ge-0/0/3. Which command shows statistics in real time?

Which CoS component helps with TCP global synchronization problems?

{master:0}[edit] user@switch# show protocols vstp vlan 100; {master:0}[edit] user@switch# run show spanning-tree bridge STP bridge parameters Context ID : 1 Enabled protocol : RSTP...

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

You have recently implemented a Layer 2 network designed to support VoIP. Users have reported that they cannot use their IP phones to make calls. {master:0}[edit] user@switch# show...

Based on the SPF calculation in the exhibit, what is the shortest path to reach R3 from R1?

Looking at the traceoptions output in the exhibit, why is the BGP neighbor not in Established state? Mar 16 18:39:15.800390 BGP RECV 172.14.10.2+57785 -> 172.14.10.1+179 Mar 16 18:...

In the exhibit, which statement about the ABR between Area 8 and Area 2 is true?

Based on the configuration in the exhibit, why are you seeing drops in the best-effort queue on the SRX Series platform? user@router> show class-of-service scheduler-map two Schedu...

Looking at the output in the exhibit, why is the BGP neighbor not in Established state? [edit protocols bgp] user@router# show group ext-peer2 { type external; peer-as 1; neighbor...

Referring to the exhibit, which three statements describe correct behavior of Switch A? (Choose three.) user@SwitchA# show protocols dot1x authenticator { authentication-profile-na...

Looking at the traceoptions output in the exhibit, why are the OSPF routers stuck in Init state? Mar 16 17:48:06.145257 OSPF periodic xmit from 172.14.10.1 to 224.0.0.5 (IFL 69 are...

A customer is trying to configure a router to peer using EBGP to a neighbor. As shown in the exhibit, two links are being used for this configuration. The goal of this configuratio...

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 do not want any of the RIP routes to be i...

In the exhibit, a customer wants to configure an EBGP connection to two different routers in a neighboring autonomous system. The goal of this configuration is to use per-prefix lo...

Referring to the exhibit, R4 in AS 100 is sending routes 20.0.0.0/8 and 10.0.0.0/8. R3 sees the routes but R5 does not. What must be configured on the R3 router for the R5 router t...

You are asked to configure an OSPF virtual link that connects remote Area 4 to the backbone. Referring to the exhibit, what are two requirements for an OSPF virtual link to operate...

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 Are...

Examine the output of the show bgp summary command shown in the exhibit. From which BGP peer is the router receiving IPv6 routes? user@router> show bgp summary Groups: 3 Peers: 3 D...