400-101 Guide

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  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
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2016 Oct 400-101 ccie dumps free download:

Q521. Which two are features of DMVPN? (Choose two.) 

A. It does not support spoke routers behind dynamic NAT. 

B. It requires IPsec encryption. 

C. It only supports remote peers with statically assigned addresses. 

D. It supports multicast traffic. 

E. It offers configuration reduction. 

Answer: D,E 

Explanation: 

DMVPN Hub-and-spoke deployment model: In this traditional topology, remote sites (spokes) are aggregated into a headend VPN device at the corporate headquarters (hub). Traffic from any remote site to other remote sites would need to pass through the headend device. Cisco DMVPN supports dynamic routing, QoS, and IP Multicast while significantly reducing the configuration effort. 

Reference: http://www.cisco.com/c/en/us/products/collateral/security/dynamic-multipoint-vpn-dmvpn/data_sheet_c78-468520.html 


Q522. Which EIGRP configuration results in subsecond failover outside of the basic routing 

protocol convergence? 

A. bfd all-interfaces 

B. timers active-time disabled 

C. timers active-time 1 

D. timers nsf route-hold 20 

Answer:


Q523. 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/ 


Q524. When you implement CoPP on your network, what is its default action? 

A. permit all traffic 

B. rate-limit bidirectional traffic to the control plane 

C. drop management ingress traffic to the control plane 

D. monitor ingress and egress traffic to the control plane by using access groups that are applied to the interface 

E. block all traffic 

Answer:


Q525. 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. Which two ports are in blocking state after STP converges? (Choose two.) 

A. the port on switch SWD that connects to switch SWE 

B. the port on switch SWF that connects to switch SWG 

C. the port on switch SWD that connects to switch SWC 

D. the port on switch SWB that connects to switch SWD 

Answer: C,D 

Explanation: 

This is a scenario that wants you to demonstrate understanding of the Root switch and Root port election process. So, it’s best to start with where the root switch will be and work down from there. It’s setup nicely because the lowest MAC address switch starts at the top and then the lower priority/higher mac addresses move down the architecture. SWA wins the root election and of course all ports in SWA are forwarding. SWB introduces the possibility for a switching loop so it’s important to understand which ports will be put into the blocking state. Since SWD is a higher MAC address it will end up with a blocked port connected to SWB to prevent a loop: and this is one of the correct answers. To prevent the possibility of another potential switching loop, SWD again ends up with the higher MAC address so blocking the link between D and C prevents a B/C/D switching loop. 


Latest 400-101 cisco ccie written:

Q526. 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 


Q527. Refer to the exhibit. 

R2 is mutually redistributing between EIGRP and BGP. 

Which configuration is necessary to enable R1 to see routes from R3? 

A. The R3 configuration must include ebgp-multihop to the neighbor statement for R2. 

B. The R2 BGP configuration must include bgp redistribute-internal. 

C. R1 must be configured with next-hop-self for the neighbor going to R2. 

D. The AS numbers configured on R1 and R2 must match. 

Answer:

Explanation: 

Whenever you redistribute from BGP to something else, BGP will only advertise externally learned routes. To allow the redistribution of iBGP routes into an interior gateway protocol such as EIGRP or OSPF, use the bgp redistribute-internal command in router configuration mode. 


Q528. In which 802.1D port state are the root bridge, the root port, and the designated port(s) elected? 

A. Listening 

B. learning 

C. forwarding 

D. blocking 

E. disabled 

Answer:

Explanation: 

STP switch port states: 

. Blocking – A port that would cause a switching loop if it were active. No user data is sent or received over a blocking port, but it may go into forwarding mode if the other links in use fail and the spanning tree algorithm determines the port may transition to the forwarding state. BPDU data is still received in blocking state. Prevents the use of looped paths. 

. Listening – The switch processes BPDUs and awaits possible new information that would cause it to return to the blocking state. It does not populate the MAC address table and it does not forward frames. In this state the root bridge, the root port, and the designated port(s) are elected. 

. Learning – While the port does not yet forward frames it does learn source addresses from frames received and adds them to the filtering database (switching database). It populates the MAC Address table, but does not forward frames. 

. Forwarding – A port receiving and sending data, normal operation. STP still monitors incoming BPDUs that would indicate it should return to the blocking state to prevent a loop. 

. Disabled – Not strictly part of STP, a network administrator can manually disable a port. 

Reference: http://en.wikipedia.org/wiki/Spanning_Tree_Protocol 


Q529. Refer to the exhibit. 

Traffic from CE1 to CE2 is traveling through the core instead of through R1. All the PE routers have a similar configuration, and BGP peering and extended-community meshing are configured correctly. 

Which configuration change routes the traffic through R1? 

A) 

B) 

C) 

D) 

A. Exhibit A 

B. Exhibit B 

C. Exhibit C 

D. Exhibit D 

Answer:


Q530. Which mechanism does Cisco recommend for CE router interfaces that face the service provider for an EVPL circuit with multiple EVCs and multiple traffic classes? 

A. HCBWFQ 

B. LLQ 

C. tail drop 

D. WRED 

Answer:

Explanation: 

In a simple handoff, packets may be discarded in the service provider network, either because of congestion on a link without an appropriate QoS policy or because of a policer QoS configuration on the service provider network that serves to rate limit traffic accessing the WAN core. To address these issues, QoS on the CE device is applied at a per-port level. A QoS service policy is configured on the outside Ethernet interface, and this parent policy includes a shaper that then references a second or subordinate (child) policy that enables queueing within the shaped rate. This is called a hierarchical CBWFQ (HCBWFQ) configuration. 

Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/Ethernet_Acces s_for_NG_MAN_WAN_V3-1_external.html 


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