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2017 Apr 400-101 pdf exam

Q461. DRAG DROP 

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

Answer: 


Q462. Which statement about the feasible distance in EIGRP is true? 

A. It is the maximum metric that should feasibly be considered for installation in the RIB. 

B. It is the minimum metric to reach the destination as stored in the topology table. 

C. It is the metric that is supplied by the best next hop toward the destination. 

D. It is the maximum metric possible based on the maximum hop count that is allowed. 

Answer:

Explanation: 

An EIGRP router advertises each destination it can reach as a route with an attached metric. This metric is called the route's reported distance (the term advertised distance has also been used in older documentation). A successor route for any given destination is chosen as having the lowest computed feasible distance; that is, the lowest sum of reported distance plus the cost to get to the advertising router. By default, an EIGRP router will store only the route with the best (lowest) feasible distance in the routing table (or, multiple routes with equivalent feasible distances). 

Reference: http://packetlife.net/blog/2010/aug/9/eigrp-feasible-successor-routes/ 


Q463. Which two statements about RSTP and MSTP BPDUs are true? (Choose two.) 

A. MSTP switches can detect boundary ports when they receive RSTP version 2 BPDUs. 

B. MSTP switches can detect boundary ports when they receive RSTP version 1 BPDUs. 

C. RSTP switches can process MSTP version 3 BPDUs. 

D. When all boundary switches are running RSTP, MST sends only version 0 configuration BPDUs. 

Answer: A,C 

Explanation: 

A switch running both MSTP and RSTP supports a built-in protocol migration mechanism that enables it to interoperate with legacy 802.1D switches. If this switch receives a legacy 802.1D configuration BPDU (a BPDU with the protocol version set to 0), it sends only 802.1D BPDUs on that port. An MST switch can also detect that a port is at the boundary of a region when it receives a legacy BPDU, an MST BPDU (version 3) associated with a different region, or an RST BPDU (version 2). 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_9_ea1/configuration/guide/scg/swmstp.html 


Q464. Which option describes the effect of the OSPF default-information originate always command? 

A. It creates a stub area. 

B. It configures the device to advertise a default route regardless of whether it exists in the routing table. 

C. It configures the device to automatically redistribute a default route. 

D. It adds a static default route to the device configuration. 

Answer:

Explanation: 

default-information originate 

To generate a default external route into an Open Shortest Path First (OSPF) routing domain, use the default-information originate command in router configuration mode. To disable this feature, use the no form of this command. 

default-information originate [always] metric metric-value [ metric-type type-value ] [ route-map map-name ] 

Syntax Description 

always (Optional) Always advertises the default route regardless of whether the software has a default route. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/command/ipv6-cr-book/ipv6-d2.html 


Q465. 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. 


Refresh 400-101 exam cram:

Q466. Which two statements about NPTv6 are true? (Choose two.) 

A. The translation is invisible to applications that hard code IP information within the application logic. 

B. It is a one-way stateful translation for the IPv6 address. 

C. Translation is 1:1 at the network layer. 

D. It is a two-way stateless translation for the network prefix. 

Answer: C,D 

Explanation: 

This document describes a stateless, transport-agnostic IPv6-to-IPv6 Network Prefix Translation (NPTv6) function that provides the address-independence benefit associated with IPv4-to-IPv4 NAT (NAPT44) and provides a 1:1 relationship between addresses in the "inside" and "outside" prefixes, preserving end-to-end reachability at the network layer NPTv6 Translation is stateless, so a "reset" or brief outage of an NPTv6 Translator does not break connections that traverse the translation function, and if multiple NPTv6 Translators exist between the same two networks, the load can shift or be dynamically load shared among them. NPTv6 is defined to include a two-way, checksum-neutral, algorithmic translation function, and nothing else. 

Reference: https://tools.ietf.org/html/rfc6296 


Q467. DRAG DROP 

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

Answer: 


Q468. DRAG DROP 

Drag and drop the argument of the mpls ip cef load-sharing command on the left to the function it performs on the right. 

Answer: 


Q469. A configuration includes the line ip route 10.0.0.0 255.0.0.0 172.16.10.10 permanent. 

Which option is a benefit of configuring this static route as permanent? 

A. It allows the route to be redistributed into the network even if the outgoing interface is down. 

B. It allows the route to be saved in the running configuration of the device. 

C. It places a hidden tag on the route that can be matched on other devices. 

D. It allows the route to have a tracking status even if no tracking object is configured. 

Answer:


Q470. DRAG DROP 

Drag each SNMP term on the left to the matching definition on the right. 

Answer: