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2021 Apr 400-101 free question

Q351. Which two statements about SoO checking in EIGRP OTP deployments are true? (Choose two). 

A. During the import process, the SoO value in BGP is checked against the SoO value of the site map. 

B. During the reception of an EIGRP update, the SoO value in the EIGRP update is checked against the SoO value of the site map on the ingress interface. 

C. At the ingress of the PE/CE link, the SoO in the EIGRP update is checked against the SoO within the PE/CE routing protocol. 

D. At the egress of the PE/CE link, the SoO is checked against the SoO within the PE/CE routing protocol. 

E. The SoO is checked at the ingress of the backdoor link. 

F. The SoO is checked at the egress of the backdoor link. 

Answer: A,B 

Explanation: 

. SoO checking: 

– During the import process the SoO value in BGP update is checked against the SoO value of the site-map attached to VRF interface. The update is propagated to CE only if there is no match (this check is done regardless of protocol used on PE/CE link). 

– At reception of EIGRP update, the SoO value in the EIGRP update is checked against the SoO value of site-map attached to the incoming interface. This update is accepted only if there is no match (this check can optionally be done on backdoor router). 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ip-routing/whitepaper_C11-730404.html 


Q352. Refer to the exhibit. 

This network is configured with PIM, and the RPF check has failed toward the multicast source. Which two configuration changes must you make to router R3 to enable the RPF check to pass? (Choose two.) 

A. Configure a static multicast route to the multicast source through the tunnel interface. 

B. Configure a static multicast route to the multicast source LAN through the tunnel interface. 

C. Configure a static multicast route to the multicast source LAN through the Ethernet interface. 

D. Remove the command ip prim bidir-enable from the R3 configuration. 

Answer: A,B 


Q353. Refer to the exhibit. 

Why is network 172.16.1.0/24 not installed in the routing table? 

A. There is no ARP entry for 192.168.1.1. 

B. The router cannot ping 192.168.1.1. 

C. The neighbor 192.168.1.1 just timed out and BGP will flush this prefix the next time that the BGP scanner runs. 

D. There is no route for 192.168.1.1 in the routing table. 

Answer:

Explanation: 

Here we see that the next hop IP address to reach the 172.16.1.0 network advertised by the BGP peer is 192.168.1.1. However, the 192.168.1.1 IP is not in the routing table of R3 so it adds the route to the BGP table but marks it as inaccessible, as shown. 


Q354. Which two types of traffic are blocked when the storm control threshold for multicast traffic is reached on a port? (Choose two.) 

A. BPDU 

B. OSPF 

C. CDP 

D. IS-IS 

E. LLDP 

Answer: B,D 


Q355. Refer to the exhibit. 

Which statement is true? 

A. The output shows an IPv6 multicast address with link-local scope. 

B. The output shows an IPv6 multicast address that is used for unique local sources only. 

C. The output shows an IPv6 multicast address that can be used for BIDIR-PIM only. 

D. The output shows an IPv6 multicast address with embedded RP. 

Answer:


Rebirth 400-101 free draindumps:

Q356. Refer to the exhibit. 

A tunnel is configured between R3 to R4 sourced with their loopback interfaces. The ip pim sparse-dense mode command is configured on the tunnel interfaces and multicast-routing is enabled on R3 and R4. The IP backbone is not configured for multicast routing. 

The RPF check has failed toward the multicast source. 

Which two conditions could have caused the failure? (Choose two.) 

A. The route back to the RP is through a different interface than tunnel 0. 

B. The backbone devices can only route unicast traffic. 

C. The route back to the RP is through the same tunnel interface. 

D. A static route that points the RP to GigabitEthernet1/0 is configured. 

Answer: A,D 

Explanation: 

.For a successful RPF verification of multicast traffic flowing over the shared tree (*,G) from RP, an ip mroute rp-address nexthop command needs to be configured for the RP address, that points to the tunnel interface. 

A very similar scenario can be found at the reference link below: 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/43584-mcast-over-gre.html 


Q357. Refer to the exhibit. 

What is a possible reason for the IPSec tunnel not establishing? 

A. The peer is unreachable. 

B. The transform sets do not match. 

C. The proxy IDs are invalid. 

D. The access lists do not match. 

Answer:

Explanation: 

Proxy Identities Not Supported 

This message appears in debugs if the access list for IPsec traffic does not match. 

1d00h: IPSec(validate_transform_proposal): proxy identities not supported 

1d00h: ISAKMP: IPSec policy invalidated proposal 

1d00h: ISAKMP (0:2): SA not acceptable! 

The access lists on each peer needs to mirror each other (all entries need to be reversible). 

This example illustrates this point. 

Peer A 

access-list 150 permit ip 172.21.113.0 0.0.0.255 172.21.114.0 0.0.0.255 

access-list 150 permit ip host 15.15.15.1 host 172.21.114.123 

Peer B 

access-list 150 permit ip 172.21.114.0 0.0.0.255 172.21.113.0 0.0.0.255 

access-list 150 permit ip host 172.21.114.123 host 15.15.15.1 

Reference: 

http://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/5409-ipsec-debug-00.html#proxy 


Q358. Refer to the exhibit. 

Which statement is true? 

A. The command ip multicast rpf multitopology is missing from the configuration. 

B. Multitopology routing for multicast has been enabled for IS-IS. 

C. This output is invalid. 

D. The command mpls traffic-eng multicast-intact is configured on this router. 

Answer:

Explanation: 

The following is sample output from the show ip rpf command in a Multi-Topology Routing (MTR) routing environment. In Cisco IOS releases that support MTR, the “RPF topology” field was introduced to indicate which RIB topology is being used for the RPF lookup. For the “RPF topology” field in this example, the first topology listed (ipv4 multicast base) indicates where the nexthop of the RPF lookup is being conducted and the second topology listed (ipv4 unicast data) indicates where the route originated from. 

Router# show ip rpf 10.30.30.32 

RPF information for ? (10.30.30.32) 

RPF interfacE. Ethernet1/0 

RPF neighbor: ? (10.1.1.32) 

RPF route/mask: 10.30.30.32/32 

RPF typE. unicast (ospf 100) 

Doing distance-preferred lookups across tables 

RPF topology: ipv4 multicast base, originated from ipv4 unicast data 

The table below describes the fields shown in the displays. 

Table 15 show ip rpf Field Descriptions 

Field 

Description 

RPF information for 

Hostname and source address for which RPF information is displayed. 

RPF interface 

For the given source, the interface from which the router expects to receive packets. 

RPF neighbor 

For the given source, the neighbor from which the router expects to receive packets. 

RPF route/mask 

Route number and mask that matched against this source. 

RPF type 

Routing table from which this route was obtained, either unicast, MBGP, DVMRP, or static mroutes. 

RPF recursion count 

The number of times the route is recursively resolved. 

Doing distance-preferred 

Whether RPF was determined based on distance or length of mask. 

Using Group Based VRF Select, RPF VRF. 

The RPF lookup was based on the group address and the VRF where the RPF lookup is being performed. 

Metric preference 

The preference value used for selecting the unicast routing metric to the RP announced by the designated forwarder (DF). 

Metric 

Unicast routing metric to the RP announced by the DF. 

RPF topology 

RIB topology being used for the RPF lookup, and, if originated from a different RIB topology, which RIB topology the route originated from. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti/command/imc-xe-3se-5700-cr-book/imc-xe-3se-3850-cr-book_chapter_010.html 


Q359. Which circumstance can cause TCP starvation and UDP dominance to occur? 

A. Too few queues are available. 

B. UDP is comprised of smaller packets than TCP. 

C. Retransmitted TCP packets are on the network. 

D. UDP and TCP data are assigned to the same service-provider class. 

Answer:


Q360. DRAG DROP 

Drag and drop the DMVPN command on the left to the corresponding function on the right. 

Answer: