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Which statement is true about loop guard?
A. Loop guard only operates on interfaces that are considered point-to-point by the spanning tree.
B. Loop guard only operates on root ports.
C. Loop guard only operates on designated ports.
D. Loop guard only operates on edge ports.
Understanding How Loop Guard Works
Unidirectional link failures may cause a root port or alternate port to become designated as root if
BPDUs are absent. Some software failures may introduce temporary loops in the network. Loop
guard checks if a root port or an alternate root port receives BPDUs. If the port is receiving
BPDUs, loop guard puts the port into an inconsistent state until it starts receiving BPDUs again.
Loop guard isolates the failure and lets spanning tree converge to a stable topology without the
failed link or bridge.
You can enable loop guard per port with the set spantree guard loop command.
Note When you are in MST mode, you can set all the ports on a switch with the set spantree
global-defaults loop-guard command.
When you enable loop guard, it is automatically applied to all of the active instances or VLANs to
which that port belongs. When you disable loop guard, it is disabled for the specified ports.
Disabling loop guard moves all loop-inconsistent ports to the listening state.
If you enable loop guard on a channel and the first link becomes unidirectional, loop guard blocks
the entire channel until the affected port is removed from the channel. Figure 8-6 shows loop
guard in a triangle switch configuration.
Figure 8-6 Triangle Switch Configuration with Loop Guard
Figure 8-6 illustrates the following configuration:
Switches A and B are distribution switches.
Switch C is an access switch.
Loop guard is enabled on ports 3/1 and 3/2 on Switches A, B, and C.
Use loop guard only in topologies where there are blocked ports. Topologies that have no blocked
ports, which are loop free, do not need to enable this feature. Enabling loop guard on a root switch
has no effect but provides protection when a root switch becomes a nonroot switch.
Follow these guidelines when using loop guard:
Do not enable loop guard on PortFast-enabled or dynamic VLAN ports.
Do not enable PortFast on loop guard-enabled ports.
Do not enable loop guard if root guard is enabled.
Do not enable loop guard on ports that are connected to a shared link.
Note: We recommend that you enable loop guard on root ports and alternate root ports on access
Loop guard interacts with other features as follows:
Loop guard does not affect the functionality of UplinkFast or BackboneFast.
Root guard forces a port to always be designated as the root port. Loop guard is effective only if
the port is a root port or an alternate port. Do not enable loop guard and root guard on a port at the
PortFast transitions a port into a forwarding state immediately when a link is established. Because
a PortFast-enabled port will not be a root port or alternate port, loop guard and PortFast cannot be
configured on the same port. Assigning dynamic VLAN membership for the port requires that the
port is PortFast enabled. Do not configure a loop guard-enabled port with dynamic VLAN
If your network has a type-inconsistent port or a PVID-inconsistent port, all BPDUs are dropped
until the misconfiguration is corrected. The port transitions out of the inconsistent state after the
message age expires. Loop guard ignores the message age expiration on type-inconsistent ports
and PVID-inconsistent ports. If the port is already blocked by loop guard, misconfigured BPDUs
that are received on the port make loop guard recover, but the port is moved into the type-
inconsistent state or PVID-inconsistent state.
In high-availability switch configurations, if a port is put into the blocked state by loop guard, it
remains blocked even after a switchover to the redundant supervisor engine. The newly activated
supervisor engine recovers the port only after receiving a BPDU on that port.
Loop guard uses the ports known to spanning tree. Loop guard can take advantage of logical ports
provided by the Port Aggregation Protocol (PAgP). However, to form a channel, all the physical
ports grouped in the channel must have compatible configurations. PAgP enforces uniform
configurations of root guard or loop guard on all the physical ports to form a channel.
These caveats apply to loop guard:
Which two statements are true about traffic shaping? (Choose two.)
A. Out-of-profile packets are queued.
B. It causes TCP retransmits.
C. Marking/remarking is not supported.
D. It does not respond to BECN and ForeSight Messages.
E. It uses a single/two-bucket mechanism for metering.
Which three options are features of VTP version 3? (Choose three.)
A. VTPv3 supports 8K VLANs.
B. VTPv3 supports private VLAN mapping.
C. VTPv3 allows for domain discovery.
D. VTPv3 uses a primary server concept to avoid configuration revision issues.
E. VTPv3 is not compatible with VTPv1 or VTPv2.
F. VTPv3 has a hidden password option.
Key Benefits of VTP Version 3
Much work has gone into improving the usability of VTP version 3 in three major areas:
The new version of VTP offers better administrative control over which device is allowed to update
other devices\’ view of the VLAN topology. The chance of unintended and disruptive changes is
significantly reduced, and availability is increased. The reduced risk of unintended changes will
ease the change process and help speed deployment.
Functionality for the VLAN environment has been significantly expanded. Two enhancements are
most beneficial for today\’s networks:
Refer to the exhibit.
Which statement is correct about the prefix 18.104.22.168/8?
A. The prefix has encountered a routing loop.
B. The prefix is an aggregate with an as-set.
C. The prefix has been aggregated twice, once in AS 100 and once in AS 200.
D. None of these statements is true.
Which two orders in the BGP Best Path Selection process are correct? (Choose two.)
A. Higher local preference, then lowest MED, then eBGP over iBGP paths
B. Higher local preference, then highest weight, then lowest router ID
C. Highest weight, then higher local preference, then shortest AS path
D. Lowest origin type, then higher local preference, then lowest router ID
E. Highest weight, then higher local preference, then highest MED
How will EIGRPv6 react if there is an IPv6 subnet mask mismatch between the Global Unicast
addresses on a point-to-point link?
A. EIGRPv6 will form a neighbor relationship.
B. EIGRPv6 will not form a neighbor relationship.
C. EIGRPv6 will form a neighbor relationship, but with the log MSG: “EIGRPv6 neighbor not on a
D. EIGRPv6 will form a neighbor relationship, but routes learned from that neighbor will not be
installed in the routing table.
Answer: A Explanation:
Which command will define a VRF with name \’CCIE\’ in IPv6?
A. ip vrf CCIE
B. ipv6 vrf CCIE
C. vrf definition CCIE
D. ipv6 vrf definition CCIE
Refer to the exhibit.
This is an MPLS VPN network with OSPF as the PE-CE routing protocol. Which statement is
A. The routing inside the VPN RED will never work correctly.
B. The routing inside the VPN RED can be enabled by configuring virtual links between the PE
C. The routing inside the VPN RED can be enabled by configuring area 0 inside the VRF on the
D. The routing inside the VPN RED will work without any special OSPF configuration.
E. The routing inside the VPN RED will work if the PE routers have a full mesh of sham-links
configured for VRF RED.
Answer: D Explanation:
Which two statements are correct about Nonstop Forwarding? (Choose two.)
A. It allows the standby RP to take control of the device after a hardware or software fault on the
B. It is a Layer 3 function that works with SSO to minimize the amount of time a network is
unavailable to users following a switchover.
C. It is supported by the implementation of EIGRP, OSPF, RIPv2, and BGP protocols.
D. It synchronizes startup configuration, startup variables, and running configuration.
E. The main objective of NSF is to continue forwarding IP packets following a switchover.
F. Layer 2 802.1w or 802.1s must be used, as 802.1d cannot process the Layer 2 changes.
G. Routing protocol tuning parameters must be the same as the NSF parameters, or failover will
Cisco Nonstop Forwarding (NSF) works with the Stateful Switchover (SSO) feature in Cisco IOS
software. NSF works with SSO to minimize the amount of time a network is unavailable to its
users following a switchover. The main objective of Cisco NSF is to continue forwarding IP
packets following a Route Processor (RP) switchover.
On a router, interface S0 is running EIGRPv6, and interface S1 is running OSPFv3. A
redistribution command is issued under OSPFv3, redistribute EIGRP 1 metric 20 under ipv6 router
ospf 1. What will happen after applying this redistribution command?
A. All routes showing up as D and D EX in the routing table will be redistributed into OSPFv3.
B. All routes showing up as D, D EX, and C in the routing table will be redistributed into OSPFv3.
C. All routes showing up as D and D EX in the routing table and the S0 interface will be
redistributed into OSPFv3.
D. All routes showing up as D in the routing table will be redistributed into OSPFv3.
E. All routes showing up as D EX in the routing table will be redistributed into OSPFv3.
D are EIGRP Internal Routes and D EX are EIGRP external routes. Both Internal and External
EIGRP routes will be redistributed with the configuration shown above
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