A service provider has a Resilient Ethernet Protocol ring running as a metro backbone between its locations in
one city. A customer wants to connect one site with one box redundant to the Resilient Ethernet Protocol ring
at two different service provider locations. How can this be done without producing any Layer 2 loops within
the network design?
6

A. Spanning tree at the service provider side only must be enabled.
B. Spanning tree at the customer side only must be enabled.
C. Flex Links at the service provider side only must be enabled.
D. Flex Links at the customer side only must be enabled.
E. EtherChannel at the service provider side and the customer side must be enabled.
F. Spanning tree at the service provider side and the customer side must be enabled.
G. Flex Links at the service provider side and the customer side must be enabled.

Refer to the exhibit.
5

If IEEE 802.1w is in use for this network design, what are two locations where spanning-tree root can be
placed to ensure the least-disruptive Layer 2 failover for clients within VLANs 3 and 4? (Choose two.)
A. Switch A
B. Switch B
C. Switch C
D. Switch D

A switched network is being designed to support a manufacturing factory. Due to cost constraints, fiber-based
connectivity is not an option. Which design allows for a stable network when there is a risk of interference
from the manufacturing hardware in use on the factory floor?
A. Design the network to include UDLD to detect unidirectional links and take them out of service.
B. Design the network to include EtherChannel bundles to prevent a single-link failure from taking downa
switch interconnection point.
C. Design the network to include loop guard to prevent a loop in the switched network when a link has too
much interference.
D. Design the network to include BackboneFast on all devices to accelerate failure convergence times.

A network designer is redesigning an enterprise campus network to ensure that Ethernet switches proactively
attempt to reconnect after a fiber cut. In the design, they will have to address areas where fiber cuts exist on
campus from past troubleshooting, where a single fiber is disconnected in the fiber pair, leading tolooping.
Which feature could be implemented in the design to allow the Spanning Tree Protocol on the switchesto be
protected?
4

A. loop guard
B. UniDirectional Link Detection
C. UniDirectional Link Detection aggressive mode
D. root guard

Refer to the exhibit.
3

You are designing a spanning-tree network for a small campus. Which two of these options would result in a
trouble-free spanning-tree network design? (Choose two.)
A. Convert all ports to trunk ports, prune off the VLANs that you do not require, and minimize the number of
blocking ports.
B. Introduce Layer 3 VLANs (SVIs) and prune off the VLANs that you do not require.
C. Convert all the ports to trunk and enable BackboneFast.
D. Convert all the ports to trunk and enable UplinkFast between all the links.

A network designer is working with a company to improve convergence at the Layer 2 control plane and
decides to use LACP. Which of these components does LACP use to create the system ID?
A. LACP system priority and switch MAC address
B. LACP port priority and switch MAC address
C. LACP port priority and port number
D. LACP system priority and port number

A network design shows two routers directly connected to an Ethernet switch using optical connections. There
is an OSPF adjacency between the routers. In this design, which solution will ensure that interface down
detection is reported as quickly as possible to the IGP?
A. optimized OSPF SPF timers
B. Bidirectional Forwarding Detection
C. automatic protection switching
D. optimized OSPF LSA timers
E. Ethernet OAM CFM monitoring

Refer to the exhibit.

A service provider would like to use Ethernet OAM to detect end-to-end connectivity failures betweenSP-SW1 and SP-SW2. In which two of these ways can you design this solution? (Choose two.)
A. Enable Y.1731 Connectivity Fault Management on the SP switches.
B. E-LMI PDUs must be forwarded over VPLS.
C. Cisco Discovery Protocol PDUs must be forwarded over the VPLS.
D. Use upward maintenance endpoints on the SP switches.
E. Enable IEEE 802.1ag Connectivity Fault Management on the SP switches.
2

A company plans to include Nonstop Forwarding and Bidirectional Forwarding Detection as a part of their
network redundancy plan. In which two ways do NSF and BFD work together when different hardware
platforms are compared? (Choose two.)
A. During supervisor engine or routing engine failover, the NSF feature will always ensure that the BFDat the
peer router will not trigger a link down independent of the used hardware platform.
B. At some hardware platforms, BFD and NSF are not supported together. During supervisor engine or
routing engine failover, the BFD at the peer router will trigger a link down.
C. To ensure that BFD at the peer router will not trigger a link down during NSF, the BFD packets must be
processed fast enough, and, during supervisor engine or routing engine failover, by processing the BFD
independent from the supervisor engine or routing engine.
D. Because BFD is always processed at the line cards (not at the supervisor engine or routing engine), a
supervisor engine or routing engine failover will not affect the BFD peer router.
E. Because BFD is always processed at the supervisor engine or routing engine, a supervisor engine or
routing engine failover will always trigger a link down at the peer router.