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2021 Mar 400-101 dumps

Q71. When EIGRP is used as the IPv4 PE-CE protocol, which two requirements must be configured before the BGP IPv4 address family can be configured? (Choose two.) 

A. the route distinguisher 

B. the virtual routing and forwarding instance 

C. the loopback interface 

D. the router ID 

Answer: A,B 

Explanation: 

A VRF must be created, and a route distinguisher and route target must be configured in order for the PE routers in the BGP network to carry EIGRP routes to the EIGRP CE site. The VRF must also be associated with an interface in order for the PE router to send routing updates to the CE router. Prerequisites Before this feature can be configured, MPLS and CEF must be configured in the BGP network, and multiprotocol BGP and EIGRP must be configured on all PE routers that provide VPN services to CE routers. 

Reference: 

http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/seipecec.html#wp1083316 


Q72. Which authentication method does OSPFv3 use to secure communication between neighbors? 

A. plaintext 

B. MD5 HMAC 

C. PKI 

D. IPSec 

Answer: D 

Explanation: 

In order to ensure that OSPFv3 packets are not altered and re-sent to the device, causing the device to behave in a way not desired by its system administrators, OSPFv3 packets must be authenticated. OSPFv3 uses the IPsec secure socket API to add authentication to OSPFv3 packets. This API supports IPv6. OSPFv3 requires the use of IPsec to enable authentication. Crypto images are required to use authentication, because only crypto images include the IPsec API needed for use with OSPFv3. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro-15-sy-book/ip6-route-ospfv3-auth-ipsec.html 


Q73. Which two packet types does an RTP session consist of? (Choose two.) 

A. TCP 

B. RTCP 

C. RTP 

D. ICMP 

E. BOOTP 

F. ARP 

Answer: B,C 

Explanation: 

An RTP session is established for each multimedia stream. A session consists of an IP address with a pair of ports for RTP and RTCP. For example, audio and video streams use separate RTP sessions, enabling a receiver to deselect a particular stream. The ports which form a session are negotiated using other protocols such as RTSP (using SDP in the setup method) and SIP. According to the specification, an RTP port should be even and the RTCP port is the next higher odd port number. 

Reference: http://en.wikipedia.org/wiki/Real-time_Transport_Protocol 


Q74. Which statement about the EIGRP RTO is true? 

A. It is six times the SRTT. 

B. It is the time that it normally takes for an update to be received by a peer. 

C. It is the time that it normally takes to receive a reply to a query. 

D. It is the average time that it takes for a reliable packet to be acknowledged. 

Answer: A 

Explanation: 

The RTO is typically six times the SRTT, the value may vary from a minimum of 200 microseconds (ms) to a maximum of 5 seconds (s). 

Reference: EIGRP for IP: Basic Operation and Configuration, Alvaro Retana, Russ White, Don Slice - 2000 


Q75. Which flag in a configuration BPDU instructs all switches to shorten their bridge table aging process from the default 300 seconds to the current forward delay value? 

A. topology change bit 

B. topology change acknowledgment bit 

C. priority bit 

D. max-age bit 

Answer: A 

Explanation: 

The Root Bridge continues to set the Topology Change flag (TCN bit) in all Configuration BPDUs that it sends out for a total of Forward Delay + Max Age seconds (default = 35 (20+15) seconds). This flag instructs all bridges to shorten their MAC address table (Bridge table) aging process from the default value of 300 seconds to the current Forward Delay value of the bridge (default=15 seconds). The TCA flag is set by the upstream bridge to tell the downstream bridges to stop sending TCN BPDUs. The TC flag is set in configuration BPDU by the Root Bridge to shorten the bridge table age-out period from default 300 seconds to Forward Delay seconds. 


Far out 400-101 free practice test:

Q76. What is the function of an implicit-null label? 

A. It notifies the upstream LSR to remove the top label in the label stack and forward the packet. 

B. It notifies the upstream LSR to add a VPN label to the label stack. 

C. It is used to statically assign a label to an IGP route. 

D. It is used to identify the router ID. 

Answer: A 


Q77. Which three features are common to OSPF and IS-IS? (Choose three.) 

A. They both maintain a link-state database from which a Dijkstra-based SPF algorithm computes a shortest path tree. 

B. They both use DR and BDR in the broadcast network. 

C. They both use hello packets to form and maintain adjacencies. 

D. They both use NSSA and stub type areas to scale the network design. 

E. They both have areas to form a two-level hierarchical topology. 

Answer: A,C,E 


Q78. Which statement about WAN Ethernet Services is true? 

A. Rate-limiting can be configured per EVC. 

B. Point-to-point processing and encapsulation are performed on the customer network. 

C. Ethernet multipoint services function as a multipoint-to-multipoint VLAN-based connection. 

D. UNIs can perform service multiplexing and all-in-one bundling. 

Answer: A 

Explanation: 

The MEF has defined a set of bandwidth profiles that can be applied at the UNI or to an EVC. A bandwidth profile is a limit on the rate at which Ethernet frames can traverse the UNI or the EVC. 

Reference: http://www.ciscopress.com/articles/article.asp?p=101367&seqNum=2 


Q79. Which three statements about the default behaviour of eBGP sessions are true? (Choose three.) 

A. eBGP sessions between sub-ASs in different confederations transmit the next hop unchanged. 

B. The next hop in an eBGP peering is the IP address of the neighbor that announced the route. 

C. When a route reflector reflects a route to a client, it transmits the next hop unchanged. 

D. The next hop in an eBGP peering is the loopback address of the interface that originated the route. 

E. The next hop in an eBGP peering is the loopback address of the neighbor that announced the route. 

F. When a route reflector reflects a route to a client, it changes the next hop to its own address. 

Answer: A,B,C 


Q80. DRAG DROP 

Drag and drop each STP port role on the left to the matching statement on the right. 

Answer: