Which option does the FabricPath technology use to create loop-free Layer 2 networks?
A.
STP
B.
TTL
C.
fabric tags
D.
FSTP
Explanation:
Well, the dump said “TTL” and I think that’s not entirely true. TTL ends up a looping packet but the loop can
still be there. Fabric path uses IS-IS and the concept of “switch-ids” which could refer to “fabric tags”…
There are also the FTag (Forwarding Tag) which specifies which path the packet traverses… Not very clear.
If the Q was something like: “Which option does the FabricPath technology use to mitigate Layer 2loops?”
I would have answered TTL.
Loop prevention and mitigation is available in the data plane, helping ensure safe forwarding that cannot be matched by any transparent bridging
technology. Cisco FabricPath frames include a timeto-live (TTL) field similar to the one used in IP, and a reverse-path forwarding (RPF) check is also applied.
http://www.cisco.com/c/dam/en/us/products/collateral/switches/nexus-7000-series-switches/at_a_glance_c45-605626.pdf
The advantages of using FabricPath include:
• MAC address scalability with conversational learning
• Spanning Tree Protocol independence: No reliance on Spanning Tree anymore. Each switch has a complete view of the Layer 2 topology, and it calculates the
Layer 2 forwarding table based a shortest-path-first calculation.
• Traffic distribution for unicast: Unicast Layer 2 traffic can take multiple equal-cost Layer 2 paths.
• Traffic distribution for multicast on multiple distribution trees: Multicast traffic can be distributed along two multidestination trees.
• More direct communication paths: Any topology is possible, so cabling two access or edge switches directly to each other creates a direct communication path,
unlike what happens with Spanning Tree.
• Simplicity of configuration: The configuration of FabricPath is very simple. Tuning may still be advised but by default the switches negotiate switch-ids allocation
with a protocol called Dynamic Resource Allocation Protocol (DRAP).
• Loop mitigation with TTL in the frame field: Layer 2 loops, as they are known of today in Spanning-Tree-Protocol-based Layer 2 networks, are mitigated by
dropping frames that have been propagated across too many hops. The Layer 2 FabricPath frames include a Time to Live (TTL) field that is decremented at each
hop. The value of the TTL field is 32.http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/guide_c07-690079.html
21st/Dec/2017 New 300-320 Exam Questions:
QUESTION
Transition to Named EIGRP without causing an outage?
A. router eigrp NAME
B. router eigrp 1 named NAME
C. router eigrp 1
eigrp upgrade-cli NAME
D. interface fa0/1
ip router eigrp 1 named NAME
Answer: C
QUESTION
Which technology should a network designer combine with VSS to ensure a loop free topology with optimal convergence time?
A. Portfast
B. UplinkFast
C. RPVST +
D. Mulitchassis EtherChannel
Answer: C
QUESTION
HSRP has been implemented on distribution switches but no priority has been defined.
Which one of the two switches will be active ?
A. The one with the higher IP address configured on the interface
B. The one with the higher MAC address configured on the interface
C. The one which booted the last
D. The one with the higher bandwith configured on the interface
Answer: A
QUESTION
An Engineer is designing a Cisco Application Centric Infrastructure network.
What is the expected number of links between Spine switches?
A. 0
B. 1
C. 2
D. 4
Answer: A
QUESTION
When designing data centers for multitenancy, which two benefits are provided by the implementation of VSAN and zoning? (choose two)
A. VSAN provides a means of restricting visibility and connectivity among devices connected to a zone
B. VSANs have their own set of services and address space, which prevents an issue in one VSAN from affecting others
C. Zones provide the ability to create many logical SAN fabrics on a single Cisco MDS 9100 family switch
D. VSANs and zones use separate fabrics
E. Zones allow an administrator to control which initiators can see which targets
Answer: BE
QUESTION
For which engine an IPS can use its reputation awareness? (Choose two)
A. Reputation filtering
B. Reputation subscriptions
C. Correlation rules
D. Global correlation inspection
Answer: AD
QUESTION
When designing a layer 2 STP-based LAN with Layer 3 FHRP, which design recommendation should be followed?
A. Avoid modifying default STP and FHRP timers.
B. Assign the native VLAN to the lowest number in use.
C. Avoid configuring router preemption.
D. Align the STP root with the active FHRP device.
Answer: C
QUESTION
A company have single ASA hardware box and they need to separate company departments in way that they can apply different rules on them, ACL, NAT, and so on…
Which mode is needed?
A. routed mode
B. transparent mode
C. multiple context mode
D. active failover mode
Answer: C
QUESTION
Engineer is designing QoS for application. Which QoS architecture should he choose if application needs to have reserved bandwidth prior to sending data?
A. Differentiated services
B. Integrated services
C. LLQ
D. ToS
Answer: B
QUESTION
An engineer chose to design an architecture where distribution switches are in VSS and are connected to access switches using Multichassis Etherchannel. What is the resulting topology?
A. Looped
B. Ring
C. Hybrid
D. Star
Answer: D
QUESTION
With which of the following could EIGRP and OSPF achieve sub second convergence ? (Choose Two)
A. BFD
B. Triangle topology
C. Square topology
D. Ring topology
E. Tuning timers
F. IP SLA
Answer: AB
QUESTION
A network designer needs to explain the advantages of route summarization to a client. Which two options are advantages that should be included in the explanation? (Choose Two)
A. Increases security by advertising fake networks.
B. Reduces routing table size.
C. Advertises detailed routing size
D. Utilizes the routers full CPU capacity.
E. Reduces the upstream impact of a flapping interface.
Answer: BD
QUESTION
A company is running BGP on the edge with multiple service providers in a primary and secondary role. The company wants to speed up time if a failure were to occur with the primary, but they are concerned about router resources. Which method best achieves this goal?
A. Utilize BFD and lower BGP hello interval
B. Decrease the BGP keepalive timer
C. Utilize BFD and tune the multiplier to 50
D. Utilize BFD and keep the default BGP timers
Answer: D
QUESTION
What is one limitation of MPLS Layer 3 VPN networks?
A. They require less powerful routers with limited capabilities
B. They require the customer to control routing
C. They support only IP traffic
D. PE routers are underutilized
Answer: C
QUESTION
If your enterprise is connected to 2 ISP, which method could you use to prevent being used as a transit network? (Choose Two)
A. filter outbound
B. filter inbound
C. throw both ISP
D. choose only one ISP
E. Allow every routes inbound
Answer: AE
QUESTION
Two company want to merge their OSPF networks , but they run different OSPF domains ,
Which is option must be created to accomplished this requirement?
A. OSPF virtual link to bridge the backbone areas of the two company together
B. Route Summarization
C. Static OSPF
D. Redistribute routes between domains
Answer: A
More new 300-320 Practice Tests: https://www.braindump2go.com/300-320.html
0
0