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2021 Mar 400-101 vce
Q241. Which two statements about SNMP are true? (Choose two.)
A. SNMPv3 provides privacy and access control.
B. All SNMP versions use get, getNext, and getBulk operations.
C. SNMPv3 uses encrypted community strings.
D. SNMPv1 and SNMPv2c use plaintext community strings.
E. All SNMP versions support bulk retrieval and detailed error messages.
Answer: A,B
Q242. Which two discovery mechanism does LDP support? (Choose two.)
A. strict
B. extended
C. loose
D. targeted
E. basic
Answer: B,E
Q243. Which two statements about EIGRP load balancing are true? (Choose two.)
A. EIGRP supports 6 unequal-cost paths.
B. A path can be used for load balancing only if it is a feasible successor.
C. EIGRP supports unequal-cost paths by default.
D. Any path in the EIGRP topology table can be used for unequal-cost load balancing.
E. Cisco Express Forwarding is required to load-balance across interfaces.
Answer: A,B
Q244. DRAG DROP
Drag and drop the OTV component on the left to the function it performs on the right.
Answer:
Q245. Refer to the exhibit.
Which two statements about this configuration are true? (Choose two.)
A. It allows 172.16.0.0/16 to be distributed into EIGRP.
B. It allows a default route to be distributed into EIGRP.
C. It allows 172.16.0.0/16 and larger subnets to be distributed into EIGRP.
D. It prevents 172.16.0.0/16 from being distributed into EIGRP.
E. It prevents a default route from being distributed into EIGRP.
F. It creates summary routes and injects them into EIGRP.
Answer: A,B
Explanation:
In this example, the prefix list is configured to only allow the two specific routes of 172.16.0.0/16 and the default route. Any other routes will be filtered.
Up to the immediate present 400-101 vce:
Q246. According to RFC 4577, OSPF for BGP/MPLS IP VPNs, when must the down bit be set?
A. when an OSPF route is distributed from the PE to the CE, for Type 3 LSAs
B. when an OSPF route is distributed from the PE to the CE, for Type 5 LSAs
C. when an OSPF route is distributed from the PE to the CE, for Type 3 and Type 5 LSAs
D. when an OSPF route is distributed from the PE to the CE, for all types of LSAs
Answer: C
Explanation:
If an OSPF route is advertised from a PE router into an OSPF area, the Down bit (DN) is set. Another PE router in the same area does not redistribute this route into iBGP of the MPLS VPN network if down is set.
RFC 4577 says:
“When a type 3 LSA is sent from a PE router to a CE router, the DN bit in the LSA Options field MUST be set. This is used to ensure that if any CE router sends this type 3 LSA to a PE router, the PE router will not redistribute it further. When a PE router needs to distribute to a CE router a route that comes from a site outside the latter’s OSPF domain, the PE router presents itself as an ASBR (Autonomous System Border Router), and distributes the route in a type 5 LSA. The DN bit [OSPF-DN] MUST be set in these LSAs to ensure that they will be ignored by any other PE routers that receive them.”
For more information about Down bit according to RFC 4577 please read more herE. http://tools.ietf.org/html/rfc4577#section-4.2.5.1.
Q247. DRAG DROP
Drag and drop each BGP feature on the left to the corresponding function it performs on the right.
Answer:
Q248. Refer to the exhibit.
Which two statements are true about the displayed STP state? (Choose two.)
A. The STP version configured on the switch is IEEE 802.1w.
B. Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago.
C. The switch does not have PortFast configured on Gi0/15.
D. BPDUs with the TCN bit set are transmitted over port channel 1.
Answer: C,D
Explanation:
A port enabled with portfast will not send topology changes when a port goes up or down, but here we see that 296 TCN’s were sent so we know that Gi 0/15 does not have portfast enabled.
TCN’s are sent using BPDU’s over the root port, which we see is port channel 1.
Q249. DRAG DROP
Drag and drop the OSPFv3 LSA type on the left to the functionality it provides on the right.
Answer:
Q250. Refer to the exhibit.
Which two statements about the device that generated the output are true? (Choose two.)
A. The SPT-bit is set.
B. The sparse-mode flag is set.
C. The RP-bit is set.
D. The source-specific host report was received.
Answer: A,D
Explanation:
In this example we can see that the s, T, and I flags are set. Here is a list of the flags and their meanings:
show ip mroute Field Descriptions
Field Description
Flags:
Provides information about the entry.
D - Dense
Entry is operating in dense mode.
S - Sparse
Entry is operating in sparse mode.
B - Bidir Group
Indicates that a multicast group is operating in bidirectional mode.
s - SSM Group Indicates that a multicast group is within the SSM range of IP addresses. This flag is reset if the SSM range changes.
C - Connected
A member of the multicast group is present on the directly connected interface.
L - Local
The router itself is a member of the multicast group.
P - Pruned
Route has been pruned. The Cisco IOS software keeps this information so that a downstream member can join the source.
R - RP-bit set
Indicates that the (S, G) entry is pointing toward the RP. This is typically prune state along the shared tree for a particular source.
F - Register flag
Indicates that the software is registering for a multicast source.
T - SPT-bit set
Indicates that packets have been received on the shortest path source tree.
J - Join SPT
For (*, G) entries, indicates that the rate of traffic flowing down the shared tree is exceeding the SPT-Threshold set for the group. (The default SPT-Threshold setting is 0 kbps.) When the J- Join shortest path tree (SPT) flag is set, the next (S, G) packet received down the shared tree triggers an (S, G) join in the direction of the source, thereby causing the router to join the source tree.
For (S, G) entries, indicates that the entry was created because the SPT-Threshold for the group was exceeded. When the J- Join SPT flag is set for (S, G) entries, the router monitors the traffic rate on the source tree and attempts to switch back to the shared tree for this source if the traffic rate on the source tree falls below the SPT-Threshold of the group for more than 1 minute.
M - MSDP created entry
Indicates that a (*, G) entry was learned through a Multicast Source Discovery Protocol (MSDP) peer. This flag is only applicable for a rendezvous point (RP) running MSDP.
X - Proxy Join Timer Running
Indicates that the proxy join timer is running. This flag is only set for (S, G) entries of an RP or "turnaround" router. A "turnaround" router is located at the intersection of a shared path (*, G) tree and the shortest path from the source to the RP.
A - Advertised via MSDP
Indicates that an (S, G) entry was advertised through an MSDP peer. This flag is only applicable for an RP running MSDP.
U - URD
Indicates that a URD channel subscription report was received for the (S, G) entry.
I - Received Source Specific Host Report
Indicates that an (S, G) entry was created by an (S, G) report. This (S, G) report could have been created by IGMPv3, URD, or IGMP v3lite. This flag is only set on the designated router (DR).
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/12s_ssm.html