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Q141. Which two statements about NetFlow are true? (Choose two.) 

A. It must be configured on each router in a network. 

B. It supports ATM LAN emulation. 

C. The existing network is unaware that NetFlow is running. 

D. It uses SIP to establish sessions between neighbors. 

E. It provides resource utilization accounting. 

Answer: C,E 

Explanation: 

NetFlow identifies packet flows for both ingress and egress IP packets. It does not involve any connection-setup protocol, either between routers or to any other networking device or end station. NetFlow does not require any change externally--either to the packets themselves or to any networking device. NetFlow is completely transparent to the existing network, including end stations and application software and network devices like LAN switches. Also, NetFlow capture and export are performed independently on each internetworking device; NetFlow need not be operational on each router in the network. NetFlow data provides fine-grained metering for highly flexible and detailed resource utilization accounting. For example, flow data includes details such as IP addresses, packet and byte counts, timestamps, type-of-service, and application ports. Service providers might utilize the information for billing based on time-of-day, bandwidth usage, application usage, or quality of service. Enterprise customers might utilize the information for departmental chargeback or cost allocation for resource utilization. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/netflow/configuration/12-4t/nf-12-4t-book/ios-netflow-ov.html 


Q142. Which value is the maximum segment size if you start with an MTU of 1500 bytes and then remove the overhead of the Ethernet header, IP header, TCP header, and the MAC frame check sequence? 

A. 1434 bytes 

B. 1460 bytes 

C. 1458 bytes 

D. 1464 bytes 

Answer:


Q143. With AutoInstall, which mechanism allows for automatic addressing of the serial interface using HDLC? 

A. ARP 

B. BOOTP 

C. DHCP 

D. SLARP 

Answer:


Q144. Refer to the exhibit. 

R1 is performing mutual redistribution, but OSPF routes from R3 are unable to reach R2. Which three options are possible reasons for this behavior? (Choose three.) 

A. R1 requires a seed metric to redistribute RIP. 

B. The RIP version supports only classful subnet masks. 

C. R1 is filtering OSPF routes when redistributing into RIP. 

D. R3 and R1 have the same router ID. 

E. R1 and R3 have an MTU mismatch. 

F. R2 is configured to offset OSPF routes with a metric of 16. 

Answer: A,C,F 

Explanation: 

A. RIP requires a seed metric to be specified when redistributing routes into that protocol. A seed metric is a "starter metric" that gives the RIP process a metric it can work with. The OSPF metric of cost is incomprehensible to RIP, since RIP's sole metric is hop count. We've got to give RIP a metric it understands when redistributing routes into that protocol, so let's go back to R1 and do so. 

C. Filtering routes is another explanation, if the routes to R2 are boing filtered from being advertised to R1. 

F. If the metric is offset to 16, then the routes will have reached the maximum hop count when redistributed to RIP. The max hop count for RIP is 16. 


Q145. Two routers are trying to establish an OSPFv3 adjacency over an Ethernet link, but the adjacency is not forming. Which two options are possible reasons that prevent OSPFv3 to form between these two routers? (Choose two.) 

A. mismatch of subnet masks 

B. mismatch of network types 

C. mismatch of authentication types 

D. mismatch of instance IDs 

E. mismatch of area types 

Answer: D,E 

Explanation: 

An OSPFv3 interface must have a compatible configuration with a remote interface before the two can be considered neighbors. The two OSPFv3 interfaces must match the following criteria: 

. Hello interval 

. Dead interval 

. Area ID 

. Optional capabilities 

The OSPFv3 header includes an instance ID field to identify that OSPFv3 packet for a particular OSPFv3 instance. You can assign the OSPFv3 instance. The interface drops all OSPFv3 packets that do not have a matching OSPFv3 instance ID in the packet header. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/unicast/configuration/guide/l3_cli_nxos/l3_ospfv3.html 


Q146. DRAG DROP 

Drag and drop the multicast protocol definition on the left to the correct default time interval on the right. 

Answer: 


Q147. Refer to the exhibit. 

Which statement is true? 

A. 2001:DB8::1/128 is a local host route, and it can be redistributed into a dynamic routing protocol. 

B. 2001:DB8::1/128 is a local host route, and it cannot be redistributed into a dynamic routing protocol. 

C. 2001:DB8::1/128 is a local host route that was created because ipv6 unicast-routing is not enabled on this router. 

D. 2001:DB8::1/128 is a route that was put in the IPv6 routing table because one of this router's loopback interfaces has the IPv6 address 2001:DB8::1/128. 

Answer:

Explanation: 

The local routes have the administrative distance of 0. This is the same adminstrative distance as connected routes. However, when you configure redistributed connected under any routing process, the connected routes are redistributed, but the local routes are not. This behavior allows the networks to not require a large number of host routes, because the networks of the interfaces are advertised with their proper masks. These host routes are only needed on the router that owns the IP address in order to process packets destined to that IP address. 

It is normal for local host routes to be listed in the IPv4 and IPv6 routing table for IP addresses of the router's interfaces. Their purpose is to create a corresponding CEF entry as a receive entry so that the packets destined to this IP address can be processed by the router itself. These routes cannot be redistributed into any routing protocol. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/ip-routing/116264-technote-ios-00.html 


Q148. DRAG DROP 

Drag and drop the BGP attribute on the left to the correct category on the right. 

Answer: 


Q149. Which two statements about VPLS are true? (Choose two.) 

A. Split horizon is used on PE devices to prevent loops. 

B. Spanning tree is extended from CE to CE. 

C. IP is used to switch Ethernet frames between sites. 

D. PE routers dynamically associate to peers. 

E. VPLS extends a Layer 2 broadcast domain. 

Answer: A,E 


Q150. Refer to the exhibit. 

Why is the router not accessible via Telnet on the GigabitEthernet0 management interface? 

A. The wrong port is being used in the telnet-acl access list. 

B. The subnet mask is incorrect in the telnet-acl access list. 

C. The log keyword needs to be removed from the telnet-acl access list. 

D. The access class needs to have the vrf-also keyword added. 

Answer:

Explanation: 

The correct command should be “access-class telnet-acl in vrf-also”. If you do not specify the vrf-also keyword, incoming Telnet connections from interfaces that are part of a VRF are rejected.