JN0-643 Exam Questions

In your 802.1X-enabled network, a RADIUS server fails to respond or authenticate a device. On an EX Series switch, what are three supported actions? (Choose three.)

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 h...

802.1X authentication was recently configured on your ge-0/0/15 port. You issue the command shown in the exhibit. {master:0} user@switch> show dot1x interface ge-0/0/15 detail ge-0...

You are asked to place employees that are in the sales group into their own VLAN called Sales_VLAN with a VLAN ID of 123 on port ge-0/0/17. The VLAN must be assigned dynamically. A...

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?

You just added a device on port ge-0/0/12 with the MAC address 00:21:cc:ba:c7:59. All access ports on this device are members of VLAN v20. The RADIUS server is currently not reacha...

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 th...

You are implementing PoE on your EX Series switch to provide power to your VoIP phones. You have a device that does not provide its class information to the switch. Which power cla...

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

NetBIOS snooping information is stored in which database on EX Series switches?

Which three PoE power allocation methods are supported on EX Series switches? (Choose three.)

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 accomplis...

A new user's Class 3 IP phone is connected to port ge-0/0/7 on an EX Series switch; however, it is not working. user@switch> show poe controller Controller Maximum Power Guard Mana...

You are troubleshooting an LLDP neighbor and cannot see the IP address of the neighboring EX Series switch. What is causing the problem?

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...

On SRX Series devices, in which order does CoS process ingress packets?

You just configured an interface as an access port and it is up and passing traffic. However, you notice that all traffic transiting this interface is being classified as best effo...

You notice that an interface receiving traffic from multiple devices with no user-configured CoS parameters has been assigned the ieee802.1p-default classifier. What is the port ty...

According to the configuration shown in the exhibit, what percentage of the traffic will be dropped when the queue fill level reaches 65 percent? [edit class-of-service] drop-profi...

You are asked to implement CoS on an EX Series switch. You attempt to configure the priority for the voice and data queue schedulers to medium-high and medium-low priority, respect...

You are asked to configure a CoS weighted tail drop profile on your EX Series switch that causes all traffic in the best effort queue to drop when the queue is 90 percent full. Whi...

You must configure a multifield classifier on ge-1/0/0. This classifier must match only TCP traffic from port number 79, set the loss priority to high, and classify the traffic as...

You are asked to reconfigure a CoS scheduler to limit the assured forwarding queue to a maximum of 75 percent of the available bandwidth. The assured forwarding queue uses a strict...

You are asked to configure an interface policer. You must ensure when the bandwidth limit and burst size are exceeded, that the packet receives a CoS parameter which increases the...

You must troubleshoot a CoS issue on an Ethernet interface which has been observed to drop packets in the best effort queue. You must determine whether the dropped packets are tail...

What are two benefits of configuring OSPF database protection? (Choose two.)

Area 1 is configured as an NSSA with no summaries. Which three types of LSAs are allowed in Area 1's database? (Choose three.)

Referring to the exhibit, and given that no other BGP manipulation has been configured, how is traffic influenced from R1 to R3?

You are asked to establish a single EBGP peering across two physical interfaces to your ISP. Which BGP feature should you use?

Referring to the exhibit, routers A, B, and C are in the same BGP AS 100. Router A prefers to route traffic through Router C. Which BGP attribute would you configure to ensure this...

Which two statements are true about SSM implementations on Junos devices? (Choose two.)

You are asked to allow a customer to tunnel STP BPDUs from Customer Switch1 to Customer Switch2 for VLAN 300 on S-VLAN v500. You have administrative access to SW1 and SW3, but not...

Referring to the exhibit, a customer is receiving an error while committing the operation on the switch. [edit protocols] user@switch# commit [edit protocols ] 'mstp' Another xSTP...

a set of terms and conditions before

You are asked to implement a captive portal on your EX Series switches. What are three required steps? (Choose three.)

Referring to the exhibit, which statement is true? Controller Maximum Power Guard Management Status Lldp index power consumption band Priority 0 792.00W 603.50W 0W Class AT_MODE Di...

You are configuring port ge-0/0/0 on an EX Series switch connected to an IP phone that does not support LLDP-MED. Which three configuration statements do you need to accomplish thi...

You are configuring CoS classifiers and want to use both BA and MF classification. After applying the configuration, you realize that the classifiers have a conflict. Which stateme...

On your EX Series switch you must configure a delay buffer for the best effort queue scheduler named BE-sch which restricts the buffer usage to only 25 percent of the available buf...

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?

Port authentication falls back to Captive Portal. In which two scenarios would the port authentication move back to 802.1X? (Choose two.)

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 Layer 2 forwarding loop occurred on your network during a scheduled maintenance period. You must prevent this behavior in the future. Which protocol should you enable on the EX S...

You have implemented 802.1X authentication in your Layer 2 network and you have only a single RADIUS server. You are asked to ensure that if the RADIUS server becomes unreachable o...

Which option is a valid IPv6 multicast address?

A company is deploying a new 802.1X port-based security infrastructure to allow users to access resources through wired Ethernet ports. However they recently deployed an RSA token-...

Which protocol reachability is advertised by OSPFv2?

Which AS path regular expression matches only routes originated in your AS?

Voice traffic is coming in on UDP port 17689. This traffic must be classified into the expedited- forwarding forwarding class. Which type of classifier is needed?

Which three attributes must a BGP update contain? (Choose three.)