[Free] 2019(Nov) EnsurePass Juniper JN0-346 Dumps with VCE and PDF 21-30

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Question No.21

Which two sequence correctly describe the correct processing order of firewall filters on an EX Series switch? (Choose two.)

  1. port filter gt; VLAN filter gt; router filter gt; transmit packet

  2. router filter gt; VLAN filter gt; port filter gt; transmit packet

  3. receive packet gt; port filter gt; VLAN filter gt;router filter

  4. receive packet gt; router filter gt; VLAN filter gt; port filter

Correct Answer: BC

Explanation:

The order in which filters are applied depends on the direction in which they are applied, as indicated here:

B: Egress filters (outbound traffic leaving the device orinterface): C: Ingress filters (inbound traffic to the device or interface):

References:

https://www.juniper.net/documentation/en_US/junos16.1/topics/task/troublesho oting/firewall- filter-qfx-series.html

Question No.22

You configured a GRE tunnel that traverses a path using default MTU settings. You want to ensure that packets are not dropped or fragmented. In this scenario, what is the maximum packet size that would traverse the GRE tunnel?

A. 1476

B.

1500

C.

1400

D.

1524

Correct Answer: A

Explanation:

The default Ethernet MTU is 1500. There is a 24 byte GRE overhead, so there remain 1476 bytes for the data packet.

References: https://kb.juniper.net/InfoCenter/index?page=contentamp;id=KB7848amp;actp=search

Question No.23

Click the Exhibit button. Referring to the exhibit, what does the asterisk (*) indicate?

image

  1. The router received this entry.

  2. This entry is stale.

  3. This entry is new.

  4. The router originated this entry.

Correct Answer: C

Explanation:

The asterisk (*) next to one of the block entries corresponds to the active route that is used for new traffic. The term #39;new traffic#39; corresponds to a single packetor an entire flow to a destination, depending on the type of switching configured.

References:

http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5212-46.html

Question No.24

Which two statements are correct about redundant trunk groups on EX Series switches? (Choose two.)

  1. Layer 2 control traffic is permitted on the secondary link.

  2. If the active link fails, then the secondary link automatically takes over.

  3. Redundant trunk groups load balance traffic across two designated uplink interfaces.

  4. Redundant trunk groups use spanning tree to provide loop-free redundant uplinks.

Correct Answer: A

Explanation:

A: While data traffic is blocked on the secondary link, Layer 2 control traffic is still permitted. For example, an LLDP session can be run between two switches on the secondary link.

B: The redundant trunk group is configured on the access switch and contains two links: a primary or active link, and a secondary link. If the active link fails, the secondary link automatically starts forwarding data traffic without waiting for normal spanning-tree protocol convergence.

References:

http://www.juniper.net/documentation/en_US/junos13.2/topics/concept/cfm-redundant-trunk- groups-understanding.html

Question No.25

Which static route next-hop value indicates that the packet will be silently dropped?

  1. resolve

  2. discard

  3. reject

  4. next-table

Correct Answer: B

Explanation:

If the static route has a discard next hop it means that if a packet does not match a more specific route, the packet is rejected and a reject route for this destination is installed in the routing table, but Internet Control Message Protocol (ICMP) unreachable messages are not sent.

References:

http://www.juniper.net/documentation/en_US/junos13.3/topics/topic-map/policy-generated- route.html

Question No.26

Click to the Exhibit button. Referring to the exhibit, which router will become the BDR if all routers are powered on at the same time?

image

  1. R3

  2. R2

  3. R1

  4. R4

Correct Answer: A

Explanation:

In LANs, the election of the designated router takes place when the OSPF network is initiallyestablished. When the first OSPF links are active, the routing device with the highest router identifier (defined by the router-id configuration value, which is typically the IP address of the routing device, or the loopback address) is elected the designated router. The routing device with the second highest router identifier is elected the backup designated router.

References:

www.juniper.net/documentation/en_US/junos16.1/topics/concept/ospf-routing-designated-router- overview.html

Question No.27

Click the Exhibit button. Referring to the exhibit, which statement is correct?

image

  1. This device is the root bridge.

  2. Thespanning tree session has timed out.

  3. The bridge priority on the root device is set to 8k.

  4. The local bridge priority is set to 8k.

Correct Answer: C

Explanation:

The Root ID field is the Bridge ID of the elected spanning tree root bridge. The bridge ID consists of a configurable bridge priority and the MAC address of the bridge. Here the bridige priority is 8192, which is 8k.

Question No.28

Which two statements about RSTP are correct? (Choose two.)

  1. RSTP is not backwards compatible with STP.

  2. RSTP isbackwards compatible with STP.

  3. RSTP permits multiple root bridges within a Layer 2 domain.

  4. RSTP permits only a single root bridge within a Layer 2 domain.

Correct Answer: BC

Explanation:

B: RSTP and STP can co-exist. RSTP achieves its rapid converges over STP through new mechanisms. If a RSTP switch connects to an STP switch, the RSTP switch will drop down to STP convergence speeds on a per-port basis.

C: Unlike 802.1d (STP), 802.1w (RSTP) uses Hello packets between bridges to maintain link states and does not rely on the root bridge.

References:

https://www.juniper.net/documentation/en_US/junos12.3/topics/concept/mx-series-rstp-port- states-roles.html

http://www.ciscopress.com/articles/article.asp?p=474236amp;seqNum=3

Question No.29

Which two statements are true about STP port states? (Choose two.)

  1. In the listening state, theport forwards all data packets.

  2. A port that has been administratively disabled under the STP protocol drops all BPDUs.

  3. In the learning state, the port drops all data packets.

  4. A port that has been administratively disabled under the STP protocol floods all BPDUs.

Correct Answer: BC

Explanation:

B: A port in the disabled state is manually isolated from the network. A port in the disabled state does not participate in frame forwarding or the operation of STP because a port in the disabled state is considered non-operational.

C: The learning state is a 15-second interval during which the bridge does not pass user data frames while the bridge is building its bridging table. As the bridge receives frames, it places the source MAC address and port of each frame into the bridging table. The learning state reduces the amount of flooding required when data forwarding begins.

Question No.30

Click the Exhibit button. Referring to the exhibit, which statement is true?

image

  1. R3 has the complete OSPF database.

  2. R3 and R4 have an adjacency state ofFull.

  3. R4 is elected as the DR.

  4. R1 and R2 are elected as DROTHERs.

Correct Answer: AC

Explanation:

C: In LANs, the election of the designated router takes place when the OSPF network is initially established. When the first OSPF links are active, the routing device with the highest router identifier (defined by the router-id configuration value, which is typically the IP address of the routing device, or the loopback address) is elected the designated router.

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