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Q1. - (Topic 3)
In policy-based routing, which action is taken for packets that do not match any of the route-map statements?
A. forwarded after the egress queue empties on the outbound interface
B. forwarded using the last statement in the route map
C. forwarded using the closest matching route-map statement
D. forwarded using destination-based routing
Answer: D
Explanation:
Each entry in a route map contains a combination of match and set statements. The match statements define the criteria for whether appropriate packets meet the particular policy (that is, the conditions to be met). The set clauses explain how the packets should be routed once they have met the match criteria.
You can mark the route-map statements as permit or deny. You can interpret the statements as follows:
• If the statement is marked as permit and the packets meet the match criteria, the set clause is applied. One of these actions involves choosing the next hop.
• If a statement is marked as deny, the packets that meet the match criteria are sent back through the normal forwarding channels, and destination-based routing is performed.
• If the statement is marked as permit and the packets do not match any route-map statements, the packets are sent back through the normal forwarding channels, and destination-based routing is performed.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/unicast/configuration/guide/l3_cli_nxos/l3pbr.pdf
Q2. - (Topic 4)
What is an Overlay Transport Virtualization extended VLAN?
A. the VLAN used to locate other AEDs
B. the VLAN used to access the overlay network by the join interface
C. the user VLAN that exists in multiple sites
D. the VLAN that must contain the overlay interface
Answer: C
Explanation: Functions of OTV
✑ Maintains a list of overlays
✑ Maintains a list of configured overlay parameters such as name, multicast address, encapsulation type, authentication, and OTV feature sets
✑ Maintains the state of the overlay interface
✑ Maintains the status of OTV VLAN membership from Ethernet infrastructure and the state of the authoritative edge device (AED) from IS-IS
✑ Maintains a database of overlay adjacencies as reported by IS-IS
✑ Maintains IP tunnel information and manages the encapsulation for data sent on the overlay network
✑ Manages delivery groups (DGs) for each overlay by snooping multicast traffic and monitoring traffic streams for active DGs
✑ Configures, starts, and stops the OTV IS-IS instance
✑ Interfaces with IP multicast to join provider multicast groups for each overlay
Q3. - (Topic 3)
Customer has configured fabricpath allocate-delay to 600. What is the effect of this?
A. The allocate-delay is the time for FP to go into forwarding state
B. It specifies the time delay for a transitioned value to be propagated throughout the network
C. It specifies the time delay for a link bringup to detect conflicts
D. The allocate-delay is the time delay for a new resource to be propagated throughout the network
Answer: D
Explanation:
Specifies the time delay for a new resource to be propagated throughout the network. Reference: http://www.cisco.com/web/techdoc/dc/reference/cli/nxos/commands/fpath/fabricpath_timers.html
Q4. - (Topic 3)
Which two types of traffic are carried over a vPC peer link when no failure scenarios are present? (Choose two.)
A. multicast data traffic
B. unicast data traffic
C. broadcast data traffic
D. vPC keep-alive messages
Answer: A,C
Explanation:
The vPC peer link is the link used to synchronize states between the vPC peer devices. The vPC peer link carries control traffic between two vPC switches and also multicast, broadcast data traffic. In some link failure scenarios, it also carries unicast traffic. You should have at least two 10 Gigabit Ethernet interfaces for peer links.
Q5. - (Topic 3)
Which SCSI terminology is used to describe source and destination nodes?
A. hosts and targets
B. initiators and targets
C. HBA and disks
D. initiators and disks
E. HBA and targets
Answer: B
Explanation:
In computer data storage, a SCSI initiator is the endpoint that initiates a SCSI session, that is, sends a SCSI command. The initiator usually does not provide any Logical Unit Numbers (LUNs).
On the other hand, a SCSI target is the endpoint that does not initiate sessions, but instead waits for initiators' commands and provides required input/output data transfers. The target usually provides to the initiators one or more LUNs, because otherwise no read or write command would be possible.
Reference: http://en.wikipedia.org/wiki/SCSI_initiator_and_target
Q6. - (Topic 3)
Which function does the graceful restart feature allow a Cisco Nexus 7000 Series router to perform?
A. Perform a rapid route convergence.
B. Initialize a standby supervisor transparently when one is present.
C. Remain in the data forwarding path through a process restart.
D. Maintain a management connection throughout a router restart.
Answer: C
Explanation:
Graceful Restart and Non Stop Routing both allow for the forwarding of data packets to continue along known routes while the routing protocol information is being restored (in the case of Graceful Restart) or refreshed (in the case of Non Stop Routing) following a processor switchover. When Graceful Restart is used, peer networking devices are informed, via protocol extensions prior to the event, of the SSO capable routers ability to perform graceful restart. The peer device must have the ability to understand this messaging. When a switchover occurs, the peer will continue to forward to the switching over router as instructed by the GR process for each particular protocol, even though in most cases the peering relationship needs to be rebuilt. Essentially, the peer router will give the switching over router a "grace" period to re-establish the neighbor relationship, while continuing to forward to the routes from that peer.
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/high-availability/solution_overview_c22-487228.html
Q7. - (Topic 1)
Which GLBP load-balancing algorithm ensures that a client is always mapped to the same VMAC address?
A. vmac-weighted
B. dedicated-vmac-mode
C. shortest-path and weighting
D. host-dependent
Answer: D
Explanation:
Host dependent—GLBP uses the MAC address of the host to determine which virtual MAC address to direct the host to use. This algorithm guarantees that a host gets the same virtual MAC address if the number of virtual forwarders does not change.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/unicast/configuration/guide/l3_cli_nxos/l3_glbp.html
Q8. - (Topic 4)
Refer to the exhibit.
This multilayer Cisco Nexus switch had been the active virtual gateway for Group 1 before it became temporarily unavailable. What will happen to GLBP Group 1 when this device becomes available again?
A. The currently active router remains active.
B. It depends on the priority value that is configured active on the router.
C. The Cisco Nexus switch becomes the active virtual gateway after 600 seconds.
D. It depends on the weighting values that are configured active on the router.
Answer: A
Explanation:
GLBP prioritizes gateways to elect an active virtual gateway (AVG). If multiple gateways have the same priority, the gateway with the highest real IP address becomes the AVG. The AVG assigns a virtual MAC address to each member of the GLBP group. Each member is the active virtual forwarder (AVF) for its assigned virtual MAC address, forwarding packets sent to its assigned virtual MAC address.
The AVG also answers Address Resolution Protocol (ARP) requests for the virtual IP address. Load sharing is achieved when the AVG replies to the ARP requests with different virtual MAC addresses.
Note: Packets received on a routed port destined for the GLBP virtual IP address terminate on the local router, regardless of whether that router is the active GLBP router or a redundant GLBP router. This termination includes ping and Telnet traffic. Packets received on a Layer 2 (VLAN) interface destined for the GLBP virtual IP address terminate on the active router.
Q9. - (Topic 4)
Which command sequence correctly enables Adapter FEX on Nexus 5000 Series Switches?
A. switch(config)# install feature-set virtualization switch(config)# feature-set virtualization
B. switch(config)# install feature-set adapter-fex switch(config)# feature-set adapter-fex
C. switch(config)# install feature-set adapter-fex switch(config)# feature-set virtualization
D. switch(config)# install feature-set virtualization switch(config)# feature-set adapter-fex
Answer: A
Explanation:
install feature-set virtualization : installs the cisco virtual machine feature set on the switch. feature-set virtualization : enables the cisco virtual machine feature on the switch.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/adapter-fex/513_n1_1/b_Configuring_Cisco_Nexus_5000_Series_Adapter-FEX_rel_5_1_3_N1/b_Configuring_Cisco_Nexus_5000_Series_Adapter- FEX_rel_5_1_3_N1_chapter_010.pdf
Q10. - (Topic 3)
Refer to the exhibit.
Which corrective action is taken to resolve the problem?
A. Trunk four VLANs on interface ethernet 199/1/1.
B. Use the shut and no shut interface ethernet 199/1/1so that the VLANs come up.
C. Place interface ethernet 199/1/1 in VLAN 4 in the N5K-2 configuration.
D. Prune all but four VLANs from vPC 199.
E. Add VLAN 4 to vPC 199.
Answer: C
Explanation:
Place interface ethernet 199/1/1 in VLAN 4 in the N5K-2 configuration.