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2021 Dec 400-101 ccie written exam number:
Q221. For which two conditions is Cisco Express Forwarding recursion disabled by default when the BGP Prefix Independent Convergence functionality is enabled? (Choose two.)
A. next hops learned with a /24 mask
B. next hops learned with any mask shorter than /32
C. next hops learned with a /32 mask
D. next hops that are directly connected
Answer: C,D
Explanation:
Recursion is the ability to find the next longest matching path when the primary path goes down. When the BGP PIC feature is not installed, and if the next hop to a prefix fails, Cisco Express Forwarding finds the next path to reach the prefix by recursing through the FIB to find the next longest matching path to the prefix. This is useful if the next hop is multiple
hops away and there is more than one way of reaching the next hop.
However, with the BGP PIC feature, you may want to disable Cisco Express Forwarding recursion for the following reasons:
. Recursion slows down convergence when Cisco Express Forwarding searches all the FIB entries.
. BGP PIC Edge already precomputes an alternate path, thus eliminating the need for Cisco Express Forwarding recursion.
When the BGP PIC functionality is enabled, Cisco Express Forwarding recursion is disabled by default for two conditions:
. For next hops learned with a /32 network mask (host routes)
. For next hops that are directly connected
For all other cases, Cisco Express Forwarding recursion is enabled.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/irg-bgp-mp-pic.html
Q222. Refer to the exhibit.
Which two benefits result from using this command on a switch? (Choose two.)
A. The port cannot forward unknown unicast packets.
B. Network security is increased on the configured port.
C. The port cannot forward unknown multicast packets.
D. The port cannot forward unknown broadcast packets.
E. Network security is increased on all ports of the switch.
F. Unknown packets of all types, except unicast, are blocked.
Answer: A,B
Q223. What is the range of addresses that is used for IPv4-mapped IPv6 addresses?
A. 2001. db9. . /32
B. 2001. db8. . /32
C. 2002. . /16
D. . . ffff. /16
E. . . ffff. 0. 0/96
Answer: E
Explanation:
IPv4-Mapped Addresses FFFF:0:0/96 are the IPv4-mapped addresses [RFC4291]. Addresses within this block should not appear on the public Internet.
Reference: https://tools.ietf.org/html/rfc5156
Q224. Refer to the exhibit.
NHRP registration is failing; what might be the problem?
A. invalid IP addressing
B. fragmentation
C. incorrect NHRP mapping
D. incorrect NHRP authentication
Answer: D
Explanation:
Configuring an authentication string ensures that only routers configured with the same string can communicate using NHRP. Therefore, if the authentication scheme is to be used, the same string must be configured in all devices configured for NHRP on a fabric
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html#w p1055432
Q225. Which statement describes Cisco PfR link groups?
A. Link groups enable Cisco PfR Fast Reroute when NetFlow is enabled on the external interfaces of the border routers.
B. Link groups define a strict or loose hop-by-hop path pReference:
C. Link groups are required only when Cisco PfR is configured to load-balance all traffic.
D. Link groups are enabled automatically when Cisco PfR is in Fast Reroute mode.
E. Link groups set a preference for primary and fallback (backup) external exit interfaces.
Answer: E
Explanation:
The Performance Routing - Link Groups feature introduced the ability to define a group of exit links as a preferred set of links, or a fallback set of links for PfR to use when optimizing traffic classes specified in an PfR policy. PfR currently selects the best link for a traffic class based on the preferences specified in a policy and the traffic class performance—using parameters such as reachability, delay, loss, jitter or MOS—on a path out of the specified link.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-link-group.html
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Q226. Which two options are disadvantages of a commingled dual-tier WAN rate-based Ethernet circuit? (Choose two.)
A. It requires the maintenance of separate chassis.
B. It has limited scalability.
C. It requires additional CPU resources at the subscriber end.
D. It is more difficult to secure.
E. It can increase the likelihood of packet drops.
Answer: A,E
Q227. Refer to the exhibit.
Which two statements about the output are true? (Choose two.)
A. 802.1D spanning tree is being used.
B. Setting the priority of this switch to 0 for VLAN 1 would cause it to become the new root.
C. The hello, max-age, and forward delay timers are not set to their default values.
D. Spanning-tree PortFast is enabled on GigabitEthernet1/1.
Answer: A,B
Explanation:
802.1D is the standard for Spanning tree, which is being used here. For priority, The priority order starts from 0 (yes, 0 is valid) and then increases in 4096. 0, 4096, 8192, 12288, …. Etc.
The lower the number is, the higher is the priority. Here we see that the current root has a priority of 8192, so configuring this with a priority of 0 will make it the new root.
Q228. Refer to the exhibit.
Which log levels are enabled for the console?
A. informational only
B. informational and debugging
C. informational, debugging, notifications, warnings, errors, critical, alerts, and emergencies
D. informational, notifications, warnings, errors, critical, alerts, and emergencies
Answer: D
Q229. Which statement about the BGP scope of the cost community is true?
A. It is shared with IBGP neighbors only.
B. It is shared with IBGP neighbors and route reflectors.
C. It is shared with EBGP neighbors only.
D. It is shared with IBGP and EBGP neighbors.
E. It is shared with IBGP and confederation peers.
Answer: E
Explanation:
The BGP Cost Community feature introduces the cost extended community attribute. The cost community is a non-transitive extended community attribute that is passed to internal BGP (iBGP) and confederation peers but not to external BGP (eBGP) peers. The cost community feature allows you to customize the local route preference and influence the best path selection process by assigning cost values to specific routes.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/s_bgpcc.html
Q230. 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.