[Free] 2019(Nov) EnsurePass Juniper JN0-346 Dumps with VCE and PDF 41-50

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Question No.41

Click the Exhibit button. A number of reports from end-users indicate that internal and external communications are intermittent and not reliable. You verified the status of the switch ports and have determined that they are up and operational. You also noticed a very high level of link bandwidth utilization on those same ports. The current topology of the affected environment is shown in the exhibit. What would be the cause of the reported issues?


  1. A lack of port-based ACLs filtering the traffic flows.

  2. A lack of a loop-prevention mechanism or protocol.

  3. A malformed route-based ACL improperly filtering traffic flows.

  4. A misconfigured interior gateway protocol (IGP).

Correct Answer: B


Enabling Spanning-Tree Protocol will mitigate loops, so ifpossible, enable Spanning-Tree Protocol on the devices in the network segment where the loop is observed.

Question No.42

Which two statements are correct regarding the root bridge election process when using STP?

(Choose two.)

  1. A higher system MAC address is preferred.

  2. A higher bridge priority is preferred.

  3. A lower system MAC address is preferred.

  4. A lower bridge priority is preferred.

Correct Answer: CD


The root bridge for each spanning-treeprotocol (STP) instance is determined by the bridge ID. The bridge ID consists of a configurable bridge priority and the MAC address of the bridge. The bridge with the lowest bridge ID is elected as the root bridge. If the bridge priorities are equal or ifthe bridge priority is not configured, the bridge with the lowest MAC address is elected the root bridge.


https://www.juniper.net/documentation/en_US/junos15.1/topics/concept/layer-2-services-stp- guidelines-statement-bridge-priority.html

Question No.43

Click the Exhibit button. The exhibit shows that Host-1 and Host-2 are attached to the switch and associated with IRB irb.1. However, traffic sent from Host-1 to Host-2 is not blocked as expected. Why is this problem occurring?


  1. Inter-VLAN traffic cannot be blocked by a router-based filter.

  2. Theblock-hostfilter is applied in the wrong direction on theirb.1interface.

  3. TheBlock-Host-2term does not contain the MAC address of Host-2.

  4. Intra-VLAN traffic cannot be blocked by a router-based filter.

Correct Answer: B


Theblock-hostfilter blocks traffic with source address of, which is traffic sent from Host-2. It shouldblock traffic from Host-1, with the source address of of

Question No.44

Click the Exhibit button. Your router is configured to peer with your ISP#39;s router using BGP. You can only control your BGP configuration. Which address families are negotiated between the two BGP peers shown in the exhibit?


  1. inet-vpn-unicast

  2. inet-unicast inet-vpn-unicast 12vpn

  3. inet-unicast inet-vpn-unicast 12vpn-signaling

  4. inet-unicast

Correct Answer: D


From the exhibit we see:

NLRI for restart configured on peer: inet-unicast inet-vpn-unicast 12vpn But we also see: NLRI that restat is negotiaded for: inet-unicast

NLRI of received end-of-rib markers: inet-unicast NLRI of all end-of-rib markers sent: inet-unicast

Question No.45

An OSPF hello packet has been sent, but bidirectional communication has not been established. What is the state of the OSPF adjacency?

  1. Down

  2. Init

  3. Exchange

  4. Loading

Correct Answer: A


Down is the first OSPF neighbor state. It means that noinformation (hellos) has been received from this neighbor, but hello packets can still be sent to the neighbor in this state.

Incorrect Asnwers:

B: The Init state specifies that the router has received a hello packet from its neighbor, but the receiving router#39;s ID was not included in the hello packet.



Question No.46

Which two statements are true about a unified ISSU? (Choose two.)

  1. It requires that Bidirectional Forwarding Detection be disabled.

  2. It is only supported on platforms with redundant control planes.

  3. It is only supported on platforms with redundant power supplies.

  4. It requires that graceful Routing Engine switchover be enabled.

Correct Answer: BD


B: Recent development work by many router vendors has focused on an effort to provide hitless control plane switchovers, which means keeping the control plane states in sync between the active and standby control planes prior to a switchover. Many consider this capability to be a prerequisite to delivering ISSU. Hitless control planeswitchovers are usually implemented using the same version of code on both active and standby control plane components. However, ISSU design additionally requires different software versions running on active and standby control plane components.

D: Unified ISSU is supported only on dual Routing Engine platforms. In addition, the graceful Routing Engine switchover (GRES) and nonstop active routing (NSR) must be enabled.

References: https://www.juniper.net/documentation/en_US/junos15.1/topics/reference/requirements/issu- system-requirements.html


Question No.47

Which state indicates that the BGP session is fully converged?

  1. Connect

  2. Up

  3. Established

  4. Active

Correct Answer: C


In order to make decisions in its operations with peers, a BGP peer uses a simple finite state machine (FSM) that consists of six states: Idle; Connect; Active; OpenSent; OpenConfirm; and Established.

In the Established state, the peers send Update messages to exchange information about each route being advertised to the BGP peer.

Question No.48

Click the Exhibit button. In the exhibit, each IP subnet in the network is associated with a unique VLAN ID. Which action will ensure that Host C will communicate with Host A and Host B?


  1. Configure all switch ports connecting to the host devices as access ports associated with a common VLAN.

  2. Configure an IRB interface for each VLAN and associate it with its corresponding VLAN.

  3. Configure all switch ports connecting to the host devices as trunk ports associated with all VLANs.

  4. Configure a port-based ACL that permits inter-VLAN routing for all configured VLANs.

Correct Answer: B


Configuring Routing Between VLANs on One Switch

To segment traffic on a LAN into separate broadcast domains, you create separate virtual LANs (VLANs).

Of course, you also want to allow these employees to communicate with people and resources in other VLANs. To forward packets between VLANs you normally you need a router that connects the VLANs. However, you can accomplish this on a Juniper Networks switch without using a router by configuring an integrated routing and bridging (IRB) interface (also known as a routed VLAN interfaceor RVIin versions of Junos OS that do not support Enhanced Layer 2 Software).

References: http://www.juniper.net/documentation/en_US/junos15.1/topics/example/RVIs-qfx-series- example1.html

Question No.49

Click to the exhibit button. Referring to the exhibit, which configuration change is needed for an

IS-IS Level 1 adjacency between R1 and R2?


  1. Configure the Io0 family ISO address 49.0002.0010.0042.0002.00 on R1.

  2. Disable Level 2 on R2#39;sge-0/0/1 interface.

  3. Configure the Io0 family ISO address 49.0002.0010.0042.0002.00 on R2.

  4. Enable Level 2 on R1#39;s ge-0/0/1 interface.

    Correct Answer: C


    Level 1 adjacencies can be formed between routers that share a common area number. We need to change ISOaddresses so that both routers have the same area number. If we change the ISO address on R2 49.0002.0010.0042.0002.00, both routers will have 0002 as area number.


    Level 2 adjacency can be formed between routers that might or might not share an areanumber.



    Question No.50

    An EBGP session sources its TCP connection from which IP address?

    1. The IP address of the primary address assigned to the loopback interface.

    2. The IP address assigned as the router ID.

    3. The IP address of the preferred address assigned to the loopback interface.

    4. TheIP address of the interface that connects the two BGP speakers.

Correct Answer: D


The BGP session between two BGP peers is said to be an external BGP (eBGP) session if the BGP peers are in different autonomous systems (AS) . A BGP session between two

BGP peers is said to be an internal BGP (iBGP) session if the BGP peers are in the same autonomous systems.

By default, the peer relationship is established using the IP address of the interface closest to the peer router.




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