28 04 2017

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QUESTION 41
Which two statements are correct about redundant trunk groups on EX Series switches? (Choose two.)

A.    Layer 2 control traffic is permitted on the secondary link.
B.    If the active link fails, then the secondary link automatically takes over.
C.    Redundant trunk groups load balance traffic across two designated uplink interfaces.
D.    Redundant trunk groups use spanning tree to provide loop-free redundant uplinks.

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

QUESTION 42
Click the Exhibit button. Referring to the exhibit, which statement is correct?
 

A.    This device is the root bridge.
B.    The spanning tree session has timed out.
C.    The bridge priority on the root device is set to 8k.
D.    The local bridge priority is set to 8k.

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 43
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?
 

A.    R3
B.    R2
C.    R1
D.    R4

Answer: A
Explanation:
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. The routing device with the second highest router identifier is elected the backup designated router.
www.juniper.net/documentation/en_US/junos16.1/topics/concept/ospf-routing-designated-router-overview.html

QUESTION 44
Click the Exhibit button. Switch-1 in the exhibit receives a packet from User A with a destination MAC address of 00:26:88:02:74:48. Which statement is correct?
 

A.    Switch-1 floods the packet out ge-0/0/6, ge-0/0/7, and ge-0/0/8.
B.    Switch-1 sends the packet out ge-0/0/7 only.
C.    Switch-1 sends the packet out ge-0/0/8 only.
D.    Switch-1 floods the packet out ge-0/0/7 and ge-0/0/8.

Answer: D
Explanation:
A switch populates its mac-address table with mac addresses registered on incoming frames. As a result, when the switch needs 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.
http://blogbt.net/index.php/2015/03/mac-address-table-arp-table-and-unicast-flooding-part-i/

QUESTION 45
Which two statements are true about OSPF not-so-stubby areas? (Choose two.)

A.    The ASBR originates Type 7 LSA a for redistributed external routes.
B.    Type 5 LSAs are translated by the ASBR into Type 7 LSAs.
C.    The ASBR originates Type 5 LSAs for redistributed external routes.
D.    Type 7 LSAs are translated by the ABR into Type 5 LSAs.

Answer: AD
Explanation:
Redistribution into an NSSA area creates a special type of link-state advertisement (LSA) known as type 7, which can only exist in an NSSA area. An NSSA autonomous system boundary router (ASBR) generates this LSA and an NSSA area border router (ABR) translates it into a type5 LSA, which gets propagated into the OSPF domain.
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/6208-nssa.html

QUESTION 46
Click the Exhibit button. Given the information shown in the exhibit, what was used to determine mastership?
 

A.    member uptime
B.    manually assigned role
C.    highest serial number
D.    manually assigned priority

Answer: A
Explanation:
When a Virtual Chassis configuration boots, the Juniper Networks Junos operating system (Junos OS) on the switches automatically runs a master election algorithm to determine which member switch assumes the role of master. The algorithm proceeds from the top condition downward until the stated condition is satisfied.

QUESTION 47
An EBGP session sources its TCP connection from which IP address?

A.    The IP address of the primary address assigned to the loopback interface.
B.    The IP address assigned as the router ID.
C.    The IP address of the preferred address assigned to the loopback interface.
D.    The IP address of the interface that connects the two BGP speakers.

Answer: D
Explanation:
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.
http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13751-23.html

QUESTION 48
Click the Exhibit button. Referring to the exhibit, which statement is true?
 

A.    R3 has the complete OSPF database.
B.    R3 and R4 have an adjacency state of Full.
C.    R4 is elected as the DR.
D.    R1 and R2 are elected as DROTHERs.

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.

QUESTION 49
You notice that there are currently two MAC addresses associated with a single access port in the bridge table on one of your EX Series switches. What are two explanations for this behavior? (Choose two.)

A.    The access port connects to an IP phone which connects to a host device.
B.    The native VLAN feature has been associated with the access port.
C.    The mac-move-limit feature has been disabled on the access port.
D.    The access port connects to multiple hosts through a rogue device.

Answer: BD
Explanation:
MAC move limiting detects MAC movement and MAC spoofing on access interfaces. You enable this feature on VLANs.

QUESTION 50
Which two statements are correct about a Virtual Chassis? (Choose two.)

A.    A Virtual Chassis is managed using a single virtual console port.
B.    Each device must be managed separately.
C.    All members in a Virtual Chassis must be running the same Junos version.
D.    You must use the same EX Series switch for all members in a Virtual Chassis.

Answer: AC
Explanation:
A: You can connect a PC or laptop directly to a console port of any member switch to set up and configure the Virtual Chassis. When you connect to the console port of any member switch, the console session is redirected to the master switch.
C: In a Virtual Chassis, each member switch must be running the same version of Juniper Networks Junos operating system (Junos OS).

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