[Free] 2018(Jan) EnsurePass Dumpsleader Juniper JN0-346 Dumps with VCE and PDF 1-10

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Enterprise Routing and Switching, Specialist (JNCIS-ENT)

Question No: 1

Which mechanism is used to share routes between routing tables?

  1. filter-based forwarding

  2. forwarding instances

  3. RIB groups

  4. routing instances

Answer: C Explanation:

A RIB group is a way to have a routing protocol, in most cases, place information in multiple route tables.

Question No: 2

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Click the Exhibit button.

A routing table contains multiple BGP routes to the same destination prefix. The route preference is the same for each route.

Referring to the exhibit, which route would be selected?

  1. route A

  2. route D

  3. route B

  4. route C

Answer: C Explanation:

Route B with the highest local preference is preferred. See step 3 below.

Understanding BGP Path Selection

The algorithm for determining the active route is as follows:

References: https://www.juniper.net/documentation/en_US/junos12.3/topics/reference/general/routing- ptotocols-address-representation.html

Question No: 3

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Click the Exhibit button.

In the exhibit, each IP subnet in the campus environment is associated with a unique VLAN ID.

Which action will ensure that Host C will communicate with Host A and Host B?

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

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

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

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

Answer: A Explanation:

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 usinga router by configuring an integrated routing and bridging (IRB) interface (also known as a routed VLAN interface-or RVI-in 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: 4

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Click the Exhibit button.

Given the configuration shown in the exhibit, what will be the threshold for storm control?

  1. 100 Kbps (kilobits per second)

  2. 100 Mbps (megabits per second)

  3. 100% (percent of link bandwidth)

  4. 100 pps (packets per second)

Answer: A Explanation:

This example shows how to configure the storm control level on interface ge-0/0/0 by setting the level to a traffic rate of 15,000 Kbps, based on the traffic rate of the combined applicable traffic streams.

To configure storm control:

Specify the traffic rate in Kbps of the combined traffic streams on a specific interface: [edit ethernet-switching-options]

user@switch# set storm-control interface ge-0/0/0 bandwidth 15000

References: https://www.juniper.net/techpubs/en_US/junos12.3/topics/example/rate- limiting-storm-control-configuring.html#X7AlwRyc817gtLBC.99

Question No: 5

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Switch-1 in the exhibit receives a packet from User A with a destination MAC address of 00:26:88:02:74:47.

Which statement is correct in this scenario?

  1. Switch-1 floods the packet out ge-0/0/6, ge-0/0/7, ge-0/0/8, and ge-0/0/9.

  2. Switch-1 floods the packet out ge-0/0/7 and ge-0/0/8.

  3. Switch-1 floods the packet out ge-0/0/7, ge-0/0/8, and ge-0/0/9.

  4. Switch-1 sends the packet out ge-0/0/7 only.

Answer: C Explanation:

To forward a frame destined to that specific mac-address, it will know out of which port to send the frame.

Flooding however occurs when the switch does not know of the destination mac-address – say the switch has not learnt that mac address yet; or maybe that specific entry expired so it got flushed away from the mac-address table. To ensure the frame reaches its intended destination, the switch will replicate that frame out of all ports, less the port where the frame was received – that’s flooding.

References:http://blogbt.net/index.php/2015/03/mac-address-table-arp-table-and-unicast- flooding-part-i/

Question No: 6

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Click the Exhibit button.

Referring to the exhibit, Router-1 and Router-2 are failing to form an IS-IS adjacency. What should you do to solve the problem?

  1. Change the IP subnet masks to match on the ge-0/0/2 interfaces of both routers.

  2. Change the ISO areas on the Io0 interfaces to match on both routers.

  3. Remove the ISO address fromge-0/0/2 on Router-1

  4. Remove theoverloadedstatement from Router-1.

Answer: C Explanation:

There are two interfaces with ISO addresses on Router-1, and they have different area IDs, 002 and 003. Only one interface on Router-1 need to have an ISO address.

Question No: 7

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Click the Exhibit button.

Referring to the exhibit, which router will be selected as the DR?

  1. R1

  2. R5

  3. R4

  4. R3

Answer: D Explanation:

Note: The higher the priority value, the greater likelihood the routing device will become the designated router.

By default,routing devices have a priority of 128. A priority of 0 marks the routing device as ineligible to become the designated router. A priority of 1 means the routing device has the least chance of becoming a designated router. A priority of 255 means the routing device is always the designated router.

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

Question No: 8

What are three extended BGP communities? (Choose three.)

A. Origin: 172.16.100.100:100

B. domain-id: 192.168.1.1:555

C. extend:454:350

D. 172.16.90.100:888

E. target:65000:65000

Answer: A,B,E Explanation:

The BGP extended communities attribute format has three fields: type:administrator:assigned-number.

type is the type of extended community and can be either the 16-bit numerical identifier of a specific BGP extended community or one of these types:

origin-Identifies where the route originated.

domain-id-Identifies the OSPF domain from which the route originated.

target-Identifies the destination to which the route is going.

bandwidth-Sets up the bandwidth extended community. Specifying link bandwidth allows you to distribute traffic unequally among different BGP paths.

rt-import-Identifies the route to install in the routing table.

src-as-Identifies the AS from which the route originated. You must specify an AS number, not an IP address.

References: https://www.juniper.net/techpubs/en_US/junos12.3/topics/usage- guidelines/policy-defining-bgp-communities-and-extended-communities-for-use-in-routing- policy-match-conditions.html

Question No: 9

What are two types of IS-IS PDUs? (Choose two.)

  1. open PDU

  2. VRF PDU

  3. hello PDU

  4. link-state PDU

Answer: C,D Explanation:

IS-IS hello (IIH) PDUs broadcast to discover the identity of neighboring IS-IS systems and to determine whether the neighbors are Level 1 or Level 2 intermediate systems.

Link-state PDUs contain information about the state of adjacencies to neighboring IS-IS systems.

References: http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/is-is- routing-overview.html

Question No: 10

How many bytes of overhead does an IP-IP tunnel add to a packet?

  1. 24 bytes

  2. 28 bytes

  3. 20 bytes

  4. 14 bytes

Answer: C Explanation:

Difference Between GRE and IP-IP Tunnel.

Generic Routing Encapsulation (GRE) and IP-in-IP (IPIP) are two rather similar tunneling mechanisms which are often confused.

In terms of less overhead, the GRE header is 24 bytes and an IP header is 20 bytes.

References:https://www.knowledgebombs.net/blog/2012/08/01/wireshark-ipip-capture- filter.html

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