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2017 Apr 400-101 free question

Q441. Which statement about how a CE router is used in an MPLS VPN is true? 

A. It is located on the customer premises, where it peers and exchanges routes with the provider edge router. 

B. It is located on the provider premises, where it peers and exchanges routes with the customer edge router. 

C. It is located on the customer premises, but it is fully controlled by the provider, which provides a full routing table to the customer. 

D. It is located on the provider premises, and it routes only MPLS label traffic. 

Answer:


Q442. 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 


Q443. Refer to the exhibit. 

Which statement about the configuration is true? 

A. This configuration is incorrect because the dialer interface number must be the same as the dialer pool number. 

B. This configuration is missing an IP address on the dialer interface. 

C. This configuration is incorrect because the MTU must match the ppp-max-payload that is defined. 

D. This configuration represents a complete PPPoE client configuration on an Ethernet connection. 

Answer:


Q444. Which two statements about the BGP community attribute are true? (Choose two.) 

A. Routers send the community attribute to all BGP neighbors automatically. 

B. A router can change a received community attribute before advertising it to peers. 

C. It is a well-known, discretionary BGP attribute. 

D. It is an optional transitive BGP attribute. 

E. A prefix can support only one community attribute. 

Answer: B,D 

Explanation: 

A community is a group of prefixes that share some common property and can be configured with the BGP community attribute. The BGP Community attribute is an optional transitive attribute of variable length. The attribute consists of a set of four octet values that specify a community. The community attribute values are encoded with an Autonomous System (AS) number in the first two octets, with the remaining two octets defined by the AS. A prefix can have more than one community attribute. A BGP speaker that sees multiple community attributes in a prefix can act based on one, some or all the attributes. A router has the option to add or modify a community attribute before the router passes the attribute on to other peers. 

Reference: 

http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/28784-bgp-community.html 


Q445. Refer to the exhibit. 

How many LSDBs will router A have? 

A. 0 

B. 1 

C. 2 

D. 3 

Answer:


Improved 400-101 real exam:

Q446. Which two statements about a network running MPLS VPN with IS-IS IGP are true? (Choose two.) 

A. IS-IS traffic engineering uses wide metric TLV type 135 with an up/down bit to define a leaked route. 

B. IS-IS traffic engineering uses wide metric TLV type 128 with an internal/external bit and an up/down bit to define a leaked route. 

C. IS-IS traffic engineering uses wide metric TLV type 130 with an internal/external bit and an up/down bit to define a leaked route. 

D. If the IS-IS up/down bit is set to 1, the leaked route originated in the L1 area. 

E. The MPLS VPN IS-IS core is inherently protected against IP-based attacks. 

Answer: A,E 


Q447. Which two statements are true about an EVPL? (Choose two.) 

A. It has a high degree of transparency. 

B. It does not allow for service multiplexing. 

C. The EVPL service is also referred to as E-line. 

D. It is a point-to-point Ethernet connection between a pair of UNIs. 

Answer: C,D 

Explanation: 

Following the MEF approach, the services that comprise the Metro Ethernet (ME) solution can be classified into the following two general categories: 

. Point-to-point (PtP) — A single point-to-point Ethernet circuit provisioned between two User Network Interfaces (UNIs). 

. Multipoint-to-multipoint (MPtMP) — A single multipoint-to-multipoint Ethernet circuit provisioned between two or more UNIs. When there are only two UNIs in the circuit, more UNIs can be added to the same Ethernet virtual connection if required, which distinguishes this from the point-to-point type. In the MEF terminology, this maps to the following Ethernet service types: 

. Ethernet Line Service Type (E-Line) — Point-to-point Ethernet service 

. Ethernet LAN Service Type (E-LAN) — Multipoint-to-multipoint Ethernet service 

Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/HA_Clusters/HA_C lusters/HA_ME3_6.pdf 


Q448. Refer to the exhibit. 

Which statement is true? 

A. There is an MPLS network that is running 6PE, and the ingress PE router has no mpls ip propagate-ttl. 

B. There is an MPLS network that is running 6VPE, and the ingress PE router has no mpls ip propagate-ttl. 

C. There is an MPLS network that is running 6PE or 6VPE, and the ingress PE router has mpls ip propagate-ttl. 

D. There is an MPLS network that is running 6PE, and the ingress PE router has mpls ip propagate-ttl. 

E. There is an MPLS network that is running 6VPE, and the ingress PE router has mpls ip propagate-ttl. 

Answer:

Explanation: 

The second hop shows and IPV6 address over MPLS, so we know that there is an MPLS network running 6PE or 6VPE. And because the second and third hops show up in the traceroute. Then TTL is being propagated because if the “no ip propagate-ttl” command was used these devices would be hidden in the traceroute. 


Q449. Refer to the exhibit. 

Which statement describes the effect on the network if FastEthernet0/1 goes down temporarily? 

A. FastEthernet0/2 forwards traffic only until FastEthernet0/1 comes back up. 

B. FastEthernet0/2 stops forwarding traffic until FastEthernet0/1 comes back up. 

C. FastEthernet0/2 forwards traffic indefinitely. 

D. FastEthernet0/1 goes into standby. 

Answer:

Explanation: 

Use the switchport backup interface interface configuration command on a Layer 2 interface to configure Flex Links, a pair of interfaces that provide backup to each other. Use the no form of this command to remove the Flex Links configuration. With Flex Links configured, one link acts as the primary interface and forwards traffic, while the other interface is in standby mode, ready to begin forwarding traffic if the primary link shuts down. The interface being configured is referred to as the active link; the specified interface is identified as the backup link. The feature provides an alternative to the Spanning Tree Protocol (STP), allowing users to turn off STP and still retain basic link redundancy. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_53_se/command/reference/2960ComRef/cli3.html#wp3269214 


Q450. DRAG DROP 

Drag and drop each SNMP security model and level on the left to the corresponding mode of authentication on the right. 

Answer: 


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