QFabric, Specialist (JNCIS-QF) v6.0
Question 1
Which three Qfabric system hardware architectures help ensure high availability and minimize downtime? (Choose three.)
- A. redundant Director devices
- B. redundant network Node groups
- C. redundant Interconnect devices
- D. redundant control plane devices
- E. redundant Director groups
Answer : ACD
Question 2
What must happen for QFabric system RVIs to become active?
- A. A network Node group is configured on the RVI VLAN.
- B. An operational Layer 2 interface is associated with the RVI VLAN.
- C. A server Node group is configured on the RVI VLAN.
- D. A Layer 3 interface is configured on the RVI VLAN.
Answer : B
Question 3
What is the function of an Interconnect device in a QFabric system?
- A. It connects endpoints such as servers or storage devices to the QFabric system.
- B. It connects all Node devices in the QFabric system and directs traffic between them.
- C. It manages, monitors, and maintains all components in the QFabric system.
- D. It supports the control plane network and facilitates communications between QFabric system devices.
Answer : A
Question 4
A customer wants to set up a QFX3000-M QFabric system to consolidate existing 1 GbE networks and to provide a low latency and high performance 10 GbE network. Network engineers must consider the licenses required to setup this system.
Which two licenses are required? (Choose two.)
- A. The license for the FCoE-to-FC gateway.
- B. The license for the QFX3000-G base QFabric software.
- C. The license for the QFX3000-M base QFabric software.
- D. The license for the QFabric Node device feature.
Answer : CD
Question 5
You have just configured a QFabric system as a transit FCoE switch between a server and an FCoE gateway device. The server's converged network adapter state is showing as
"Dead".
Which two commands will assist in troubleshooting the issue? (Choose two.)
- A. show dcbx neighbors
- B. show fip snooping
- C. show fibre-channel flogi nport
- D. show hba connections
Answer : AB
Question 6
According to Juniper Networks recommendations, specific ports have been reserved on the
EX4200 switches to connect to each of the QFX3000-M QFabric system device types.
Which ports connect to the Interconnect devices?
- A. ports 0-3
- B. ports 16-19
- C. ports 20-23
- D. uplink port 0 and port 1
Answer : B
Question 7
You are cabling the data plane of a QFabric system using QFX3008-I Interconnect devices.
You require an uplink capacity of 320 Gbps from each Node device.
Which two statements are true? (Choose two.)
- A. You must explicitly enable ports 4-7 as uplink ports on the Node devices.
- B. You must use QFX3500 Node devices.
- C. You must use QFX3600 Node devices.
- D. You must explicitly enable ports 13-16 as uplink ports on the Node devices.
Answer : AC
Question 8
You notice that Fibre Channel over Ethernet (FCoE) traffic is dropped in a QFabric system.
What are two reasons why this is happening? (Choose two.)
- A. The FCoE traffic is not classified correctly at the egress interface.
- B. The FCoE traffic is not classified correctly at the ingress interface.
- C. Priority-based flow control (PFC) is not enabled.
- D. Data center bridging exchange (DCBx) is enabled.
Answer : BC
Question 9
-- Exhibit --
On node2:
user@node2> show ethernet-switching table
Ethernet-switching tablE.119 entries, 104 learned
VLAN MAC address Type Age Interfaces
vlan200 * Flood - N2:All-members
N3:All-members -
N4:All-members -
vlan200 00:00:02:00:00:01 Learn 0 N2:ae0.0
vlan200 00:00:02:00:00:02 Learn 0 N2:ae0.0
vlan200 00:00:02:00:00:03 Learn 0 N2:ae0.0
vlan200 00:00:02:00:00:06 Learn 0 N2:ae0.0
On node5:
user@node5> show ethernet-switching table
Ethernet-switching tablE.119 entries, 104 learned
VLAN MAC address Type Age Interfaces
vlan200 * Flood - N2:All-members
N3:All-members -
N4:All-members -
vlan200 00:00:05:00:00:01 Learn 0 N5:ae0.0
vlan200 00:00:05:00:00:02 Learn 0 N5:ae0.0
vlan200 00:00:05:00:00:03 Learn 0 N5:ae0.0
vlan200 00:00:05:00:00:06 Learn 0 N5:ae0.0
user@node5>show route forwarding-table family ethernet-switching vlan vlan200---qfabric
Routing tablE.default.ethernet-switching
Destination Type RtRef Next hop Type Index NhRef Netif
7, * user 0 comp 1676 2
7, * intf 0 rslv 1650 1
7, 00:00:02:00:00:01 user 0 comp 1673 51
7, 00:00:02:00:00:02 user 0 comp 1673 51
7, 00:00:02:00:00:03 user 0 comp 1673 51
7, 00:00:02:00:00:05 user 0 comp 1673 51
7, 00:00:02:00:00:06 user 0 comp 1673 51
user@qfabric>show route fabric table default.bridge.0 bridge-route-mac-address
00:00:02:00:00:01
default.bridge.0: 110 destinations, 165 routes (110 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
-- Exhibit --
Click the Exhibit button.
Referring to the exhibit, Host A on Node device node2 and Host B on Node device node5 are on the same VLAN but Host A cannot ping Host B.
Host A's MAC address is 00:00:02:00:00:01.
Host B's MAC address is 00:00:05:00:00:01.
What is causing this problem?
- A. Host B is not connected to Node device node5.
- B. The MAC address of Host A is not learned in node2.
- C. The MAC address of Host A is not in the RPDf table of Node device node5.
- D. The MAC address of Host B is not learned in node5.
Answer : C
Question 10
-- Exhibit
-- Exhibit --
Click the Exhibit button.
Server B is attached to the yellow VLAN. Server C is attached to the pink VLAN.
Referring to the exhibit, which statement is true about server B?
- A. Server B can communicate with Server C directly, because both devices are on SNG-1.
- B. Server B can communicate with Server C through the Director group.
- C. Server B can communicate with Server C if RVIs for the associated subnets are defined.
- D. Server B can communicate with Server C through the fabric manager Routing Engine.
Answer : C
Question 11
You are troubleshooting latency on a Node device on your QFabric system and discover a
Layer 2 loop.
What would cause this behavior?
- A. STP was disabled on the Interconnect devices.
- B. A switch was attached to both nodes in a redundant server Node group.
- C. Data center bridging was disabled on the affected Node device.
- D. The fabric administrator is unresponsive.
Answer : B
Question 12
-- Exhibit --
user@qfabric> show fabric administration inventory
Item Identifier Connection Configuration
Ungrouped Node device -
P4086-C Disconnected -
P4088-C Disconnected -
Node group -
NW-NG-0 Connected Configured -
RSNG-1 Disconnected -
Node-2 P4097-C Disconnected -
Node-3 P3603-C Disconnected -
Interconnect device -
IC-P4840-C Connected Configured -
P4840-C/RE0 Connected -
IC-P4846-C Connected Configured -
P4846-C/RE0 Connected -
Fabric manager -
FM-0 Connected Configured -
Fabric control -
FC-0 Connected Configured -
FC-1 Disconnected -
Diagnostic routing engine -
DRE-0 Connected Configured -
-- Exhibit --
Click the Exhibit button.
Which two statements are true for the system shown in the exhibit? (Choose two.)
- A. The RSNG-1 Node group has not yet received its configuration and is currently waiting for its associated Node devices to join the group.
- B. The NW-NG-0 Node group will select the first Node device to join the group as the Routing Engine for the group and will designate all others as PFEs.
- C. The Node devices listed as ungrouped Node devices have been administratively removed from the system's configuration.
- D. The current state of the FC-1 Routing Engine indicates a problem or a transitioning state caused by improper control plane communications.
Answer : A,D
Question 13
Which command executed from NW-NG-0 displays the PFE ID for all nodes in the fabric?
- A. show fabric administration inventory
- B. show virtual-chassis protocol adjacency fabric
- C. show oam fabric internal-database device
- D. show virtual-chassis status fabric
Answer : C
Question 14
You must determine which FTE interfaces of a Node device named Node-1 are connected to which Interconnect device.
Which operational mode command provides the desired information?
- A. show interfaces fabric Node-1:fte* extensive
- B. show fabric administration inventory node-devices Node-1
- C. show chassis fabric connectivity device Node-1
- D. show fabric administration inventory interconnect-devices
Answer : C
Question 15
Which routing table is used to store Layer 2 routing information on system components?
- A. bgp.bridge.0
- B. bgp.bridgevpn.0
- C. bgp.macvpn.0
- D. bgp.mac.0
Answer : B