400-101 Guide

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  • Cisco
  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
  • 911 Q&As
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  • Jun 18,2018
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Quick Guide: 400 101 dumps

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Q91. 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 


Q92. Refer to the exhibit. 

All switches have default bridge priorities, and originate BPDUs with MAC addresses as indicated. The numbers shown are STP link metrics. 

After STP converges, you discover that traffic from switch SWG toward switch SWD takes a less optimal path. What can you do to optimize the STP tree in this switched network? 

A. Change the priority of switch SWA to a lower value than the default value. 

B. Change the priority of switch SWB to a higher value than the default value. 

C. Change the priority of switch SWG to a higher value than the default value. 

D. Change the priority of switch SWD to a lower value than the default value. 

Answer:

Explanation: 

In this topology, we see that all port paths and priorities are the same, so the lowest MAC address will be used to determine the best STP path. From SWG, SWE will be chosen as the next switch in the path because it has a lower MAC address than SWF. From SWE, traffic will go to SWC because it has a lower MAC address, and then to SWD, instead of going from SWE directly to SWD. If we lower the priority of SWD (lower means better with STP) then traffic will be sent directly to SWD. 


Q93. Which IP SLA operation type uses IP to measure the round-trip time between a router and a device? 

A. HTTP 

B. ICMP Echo 

C. ICMP Path Jitter 

D. UDP Jitter for VoIP 

Answer:


Q94. Which statement about the bgp soft-reconfig-backup command is true? 

A. It requires BGP to store all inbound and outbound updates. 

B. It overrides soft reconfiguration for devices that support inbound soft reconfiguration. 

C. When the peer is unable to store updates, the updates are implemented immediately. 

D. It provides soft reconfiguration capabilities for peers that are unable to support route refresh. 

E. It provides outbound soft reconfiguration for peers. 

Answer:


Q95. Which two options are causes of out-of-order packets? (Choose two.) 

A. a routing loop 

B. a router in the packet flow path that is intermittently dropping packets 

C. high latency 

D. packets in a flow traversing multiple paths through the network 

E. some packets in a flow being process-switched and others being interrupt-switched on a transit router 

Answer: D,E 

Explanation: 

In traditional packet forwarding systems, using different paths have varying latencies that cause out of order packets, eventually resulting in far lower performance for the network application. Also, if some packets are process switched quickly by the routing engine of the router while others are interrupt switched (which takes more time) then it could result in out of order packets. The other options would cause packet drops or latency, but not out of order packets. 


Q96. Refer to the exhibit. 

Which option is the result of this configuration? 

A. Devices in OSPF area 15 can reach the summary route 192.168.0.0/16 and its more specific subnets. 

B. Devices in OSPF area 15 can reach only the more specific routes of 192.168.0.0/16. 

C. Devices in OSPF area 0 can reach the summary route 192.168.0.0/16 and its more specific subnets. 

D. Devices in OSPF area 0 can reach only the summary route of 192.168.0.0/16. 

Answer:

Explanation: 

. area range 

To consolidate and summarize routes at an area boundary, use the area range command in router configuration mode. To disable this function, use theno form of this command. Area area-id range ip-address mask [advertise | not-advertise] [cost cost] no area area-id range ip-address mask [advertise | not-advertise] [cost cost] 

. Syntax Description 

area-id 

Identifier of the area about which routes are to be summarized. It can be specified as either a decimal value or as an IP address. 

ip-address 

IP address. 

mask 

IP address mask. 

advertise 

(Optional) Sets the address range status to advertise and generates a Type 3 summary link-state advertisement (LSA). 

not-advertise 

(Optional) Sets the address range status to DoNotAdvertise. The Type 3 summary LSA is suppressed, and the component networks remain hidden from other networks. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfospf. html 


Q97. Refer to the exhibit. 

Which AS paths are matched by this access list? 

A. the origin AS 64496 only 

B. the origin AS 64496 and any ASs after AS 64496 

C. the directly attached AS 64496 and any ASs directly attached to AS 64496 

D. the directly attached AS 64496 and any longer AS paths 

Answer:

Explanation: 

If you want AS 1 to get networks originated from AS 4 and all directly attached ASs of AS 4, apply the following inbound filter on Router 1. ip as-path access-list 1 permit ^4_[0-9]*$ router bgp 1 neighbor 4.4.4.4 remote-as 4 neighbor 4.4.4.4 route-map foo in route-map foo permit 10 match as-path 1 In the ip as-path access-list command, the carat (^) starts the input string and designates "AS". The underscore (_) means there is a a null string in the string that follows "AS 4". The [0-9]* specifies that any connected AS with a valid AS number can pass the filter. The advantage of using the [0-9]* syntax is that it gives you the flexibility to add any number of ASs without modifying this command string. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13754-26.html 


Q98. A floating static route appears in the routing table of an interface even when the interface is unusable. 

Which action can you take to correct the problem? 

A. Remove the permanent option from the static route. 

B. Correct the administrative distance. 

C. Configure the floating static route to point to another route in the routing table. 

D. Correct the DHCP-provided route on the DHCP server. 

Answer:


Q99. What is the maximum number of classes that MQC can support in a single policy map? 

A. 512 

B. 256 

C. 128 

D. 64 

Answer:


Q100. According to RFC 4577, OSPF for BGP/MPLS IP VPNs, when must the down bit be set? 

A. when an OSPF route is distributed from the PE to the CE, for Type 3 LSAs 

B. when an OSPF route is distributed from the PE to the CE, for Type 5 LSAs 

C. when an OSPF route is distributed from the PE to the CE, for Type 3 and Type 5 LSAs 

D. when an OSPF route is distributed from the PE to the CE, for all types of LSAs 

Answer:

Explanation: 

If an OSPF route is advertised from a PE router into an OSPF area, the Down bit (DN) is set. Another PE router in the same area does not redistribute this route into iBGP of the MPLS VPN network if down is set. 

RFC 4577 says: 

“When a type 3 LSA is sent from a PE router to a CE router, the DN bit in the LSA Options field MUST be set. This is used to ensure that if any CE router sends this type 3 LSA to a PE router, the PE router will not redistribute it further. When a PE router needs to distribute to a CE router a route that comes from a site outside the latter’s OSPF domain, the PE router presents itself as an ASBR (Autonomous System Border Router), and distributes the route in a type 5 LSA. The DN bit [OSPF-DN] MUST be set in these LSAs to ensure that they will be ignored by any other PE routers that receive them.” 

For more information about Down bit according to RFC 4577 please read more herE. http://tools.ietf.org/html/rfc4577#section-4.2.5.1. 


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