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2021 Apr 400-101 actual test

Q71. Which two statements about redistribution are true? (Choose two.) 

A. When BGP traffic is redistributed into OSPF, the metric is set to 1 unless the metric is defined. 

B. When EIGRP routes on a CE are redistributed through a PE into BGP, the Cost Community POI is set automatically. 

C. When OSPF traffic is redistributed into BGP, internal and external routes are redistributed. 

D. When BGP traffic is redistributed into OSPF, eBGP and iBGP routes are advertised. 

E. iBGP routes automatically redistribute into the IGP if the routes are in the routing table. 

F. When EIGRP traffic is redistributed into BGP, a default metric is required. 

Answer: A,B 

Q72. Refer to the exhibit. 

The interface FastEthernet0/1 of both routers R4 and R5 is connected to the same Ethernet segment with a multicast receiver. Which two statements are true? (Choose two) 

A. Multicast traffic that is destined to a receiver with IP address will flow through router R4. 

B. Both routers R4 and R5 will send PIM join messages to the RP. 

C. Only router R5 will send a multicast join message to the RP. 

D. Multicast traffic that is destined to a receiver with IP address will flow through router R5. 

Answer: C,D 


Even though R4 is the active HSRP router, traffic will flow through R5 and only R5 will send the join messages. The Multicast DR is elected by the higher IP address or priority. R5 has and R4 has R5 is the DR which sends all packets to the RP. 

Q73. On a broadcast interface, which two OSPF states support BFD sessions? (Choose two.) 

A. DR 



D. 2WAY 



Answer: A,B 

Q74. What is a disadvantage of using aggressive mode instead of main mode for ISAKMP/IPsec establishment? 

A. It does not use Diffie-Hellman for secret exchange. 

B. It does not support dead peer detection. 

C. It does not support NAT traversal. 

D. It does not hide the identity of the peer. 



IKE phase 1's purpose is to establish a secure authenticated communication channel by using the Diffie–Hellman key exchange algorithm to generate a shared secret key to encrypt further IKE communications. This negotiation results in one single bi-directional ISAKMP Security Association (SA). The authentication can be performed using either pre-shared key (shared secret), signatures, or public key encryption.Phase 1 operates in either Main Mode or Aggressive Mode. Main Mode protects the identity of the peers; Aggressive Mode does not. 

Reference: http://en.wikipedia.org/wiki/Internet_Key_Exchange 

Q75. 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 

Up to the minute 400-101 free practice exam:

Q76. Which two routing protocols are not directly supported by Cisco PfR route control, and rely on the Cisco PfR subfeature PIRO? (Choose two.) 



C. Static routing 



Answer: D,E 


Protocol Independent Route Optimization (PIRO) introduced the ability of Performance Routing (PfR) to search for a parent route—an exact matching route, or a less specific route—in the IP Routing Information Base (RIB), allowing PfR to be deployed in any IP-routed environment including Interior Gateway Protocols (IGPs) such as OSPF and IS-IS. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-piro.html 

Q77. Which two statements about OSPF route types are true? (Choose two.) 

A. The cost of an external type 2 route is the sum of the external and internal costs. 

B. The cost of an external type 2 route is the same as the external cost. 

C. Intra-area routes originate outside of their area. 

D. Inter-area routes originate inside their area. 

E. The cost of an external type 1 route is the same as the internal cost. 

F. For routes to the same destination, external type 1 routes are preferred over external type 2 routes. 

Answer: B,F 


External routes fall under two categories, external type 1 and external type 2. The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. A type 1 route is always preferred over a type 2 route for the same destination. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html 

Q78. Which measure does IS-IS use to avoid sending traffic with a wrong MTU configuration? 

A. IS-IS does not protect from MTU mismatch. 

B. MTU value is communicated in IS-IS Sequence Number PDUs (SNP), and IS-IS adjacency is not established if an MTU mismatch is detected. 

C. IS-IS uses path MTU discovery as specified in RFC 1063. 

D. IS-IS uses padding of hello packets to full MTU. 



Intermediate System-to-Intermediate System (IS-IS) hellos are padded to the full maximum transmission unit (MTU) size. The benefit of padding IS-IS Hellos (IIHs) to the full MTU is that it allows for early detection of errors due to transmission problems with large frames or due to mismatched MTUs on adjacent interfaces. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/47201-isis-mtu.html 

Q79. Refer to the exhibit. 

Two multicast domains are configured as shown and connected with MSDP, but the two 

domains are unable to communicate. Which two actions can you take to correct the problem? (Choose two.) 

A. Change the peering IP address in AS 65220 to 

B. Change the peering AS on R2 to 65210. 

C. Verify that UDP port 639 is open. 

D. Verify that TCP port 139 is open. 

E. Change the MSDP originator-id to GigabitEthernet 0/0/0 on both routers. 

F. Change the MSDP peering IP address on R2 to 

Answer: A,B 

Q80. Refer to the exhibit. 

Why is the loopback 0 interface of R4 missing in the routing table of R2? 

A. R2 is configured as a route reflector client. 

B. There is no peering between R2 and R3. 

C. The next hop is not reachable from R2. 

D. The route originated within the same AS. 



In the “show ip bgp” output we see that there is no peering session between R2 and R3. Since R3 is the route reflector here, R3 would reflect routes advertised from R4 to R2, but the peer needs to be established first.