Data Center, Professional v8.0
Question 1
Referring to the exhibit, R1 and R2 are QFX5100s and are acting as VXLAN Layer 2
Gateways for VLAN 100 using PIM-SM signaling.
What will cause R2 to send a (*.G) PIM Join towards the RP?
- A. R2 will send a (*.G) PIM Join when its VLAN 100 configuration is committed.
- B. R2 will send a (*.G) PIM Join when it first learns the MAC address of a locally attached host.
- C. R2 will send a (*.G) PIM Join when it receives broadcast, multicast, or unknown unicast traffic from Host B.
- D. R2 will send a (*.G) PIM Join when it receives broadcast, multicast, or unknown unicast traffic from Host A.
Answer : A
Question 2
A customer has a 3-stage Clos architecture with three spine devices as shown in the exhibit.
If a single spine device fails, what percentage of the remaining bandwidth will be available from leaf node to leaf node?
- A. approximately 25%
- B. approximately 75%
- C. approximately 33%
- D. approximately 66%
Answer : D
Explanation:
Leaf-to-leaf communication has 3 paths via each Spine node; lose 1 Spine, lose 1 path, i.e.
33%
Question 3
You are building a DCI solution and need both a Layer 2 solution and a Later 3 solution for different workloads within your data centers.
What are two reasons why MPLS would be used a transport for this DCI solution? (Choose two.)
- A. The fast failover capabilities of MPLS nodes can be accomplished in a recovery time that is equivalent to 50 ms or better.
- B. MPLS allows you to natively runnel your own Layer 2 traffic through the service provided L3VPN.
- C. MPLS allows you to interconnect multiple data centers over a public IP network.
- D. MPLS allows for any-to-any connectivity allowing for both Layer 2 and Layer 3 DCIs.
Answer : A,D
Question 4
Which two technologies provide Layer 2 services across data centers in two remote locations? (Choose two.)
- A. L3VPN
- B. VPLS
- C. EVPN
- D. MSDP
Answer : BC
Question 5
In a preprovisioned mixed Virtual Chassis, which statement is correct about converting a
40Gbps QSFP+ to a Virtual Chassis port in an EX4300?
- A. LLDP is enabled on that interface.
- B. LLDP is disabled on that interface.
- C. One end of the link is configured as a Virtual Chassis port.
- D. Both ends of the link have the default configuration.
Answer : C
Question 6
What are three benefits of EVPN that would improve the current E-line, E-LAN, and E-Tree delivery? (Choose three.)
- A. greater Multiprotocol Label Switching scale
- B. native support for multihoming
- C. integrated L2/L3 connectivity
- D. network resiliency between edge nodes
- E. efficient security provisioning
Answer : B,C,D
Question 7
You are deploying 50 QFX5100 switches in your data center. You are asked to explain the benefits of using ZTP during your deployment of these devices.
What is a benefit of this deployment?
- A. You must use DHCP options to provide Junos installation packages to all devices.
- B. You must use DHCP options to provide the transfer mode used for pulling files from a storage server.
- C. You can use DHCP options to push the configuration files to all devices.
- D. You can use DHCP options to indicate which Junos version the switches should be running.
Answer : B
Question 8
You are attempting to deploy a VCF as shown in the exhibit. SW-1 and SW-2 are functioning as the spine devices and SW-3 and SW-4 are functioning as the leaf devices.
However, the VCF is not functioning properly.
Which two actions would solve this problem? (Choose two.)
- A. Switch the positions of SW-1 and SW-3.
- B. Switch the positions of SW-2 and SW-3.
- C. Switch the positions of SW-1 and SW-4.
- D. Switch the positions of SW-2 and SW-4.
Answer : BC
Question 9
You are performing an in-service software upgrade (ISSU) on an QFX5100 Series device.
Which two statements are correct in this scenario? (Choose two.)
- A. The ksyncd process is used to synchronize the state of the master RE to the new backup RE.
- B. The dcd process is used to validate system configuration requirements.
- C. The vccpd process is used to synchronize the state of the master RE to the new backup RE.
- D. The mgd process is used to validate system configuration requirements.
Answer : A,D
Question 10
VMs on Server-1 and Server-2 are on the same Layer 2 domain within a VCF and are sending traffic to each other.
Referring to the exhibit, which three criteria are used when load-balancing traffic? (Choose three.)
- A. EtherType
- B. source MAC
- C. incoming port ID
- D. Layer 4 source port
- E. destination IP
Answer : ABC
Question 11
You are implementing a Virtual Chassis using QFX5100s and EX4300s in your data center.
In this scenario. which three hardware capabilities are affected? (Choose three.)
- A. usable VCP connections limited to 10GbE
- B. MAC table size
- C. number of usable ports per member
- D. number of supported routing instances
- E. maximum number of firewall filters
Answer : BDE
Question 12
Which statement is correct about EVPN Type 2 routers?
- A. An EVPN Type 2 route prevents the need to advertise host IP reachability.
- B. An EVPN Type 2 route provides local proxy-arp for remote hosts.
- C. An EVPN Type 2 route allows data plane-based host MAC learning.
- D. An EVPN Type 2 route disables MAC flowing to remote hosts.
Answer : C
Question 13
You are having management connectivity problems with a mixed-mode Virtual Chassis.
Which statement is correct in this scenario?
- A. The master RE’s me0 MAC address should match the MAC address of the vme.
- B. Each member’s me0 MAC address should match the MAC address on the vme.
- C. Each member’s me0 MAC address should not match the MAC address of the vme.
- D. The current me0 MAC address should match the MAC address of the vme.
Answer : D
Question 14
Which three BGP messages pass EVPN information between devices? (Choose three.)
- A. open messages
- B. update messages
- C. notification messages
- D. keepalive messages
- E. route-refresh messages
Answer : A,B,E
Explanation:
A BGP open messages contain information used to negotiate the establishment of sessions but do not contain route information itself. They may contain information such as I can exchange EVPN AFI x/SAFI y NLRI with you, but not EVPN information itself.
B BGP update messages can contain EVPN NLRI information. This is the routing information itself.
NOT C BGP notification messages indicate error conditions and contain basic error codes but no routing information. Technically they could refer to an error relating to EVPN, however this is not a good fit for the question being asked.
NOT D BGP keepalive messages are always 19 bytes and uniform; no NLRI information.
E A BGP speaker can send a ROUTE-REFRESH message to request the receiver re- sends their previously-sent BGP updates which, as per C, can include EVPN NLRI information.
Question 15
An EX9200 switch is acting as a Layer 3 VXLAN gateway.
In this scenario. which action will allow you to communicate between two VLANs?
- A. Configure L3 physical interfaces to connect the VXLANs.
- B. Configure IRB interfaces to connect the VXLANs.
- C. Configure LAG interfaces to connect the VXLANs.
- D. Configure a VPLS instance.
Answer : B