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Q431. What are two reasons to define static peers in EIGRP? (Choose two.) 

A. Security requirements do not allow dynamic learning of neighbors. 

B. The link between peers requires multicast packets. 

C. Back-level peers require static definition for successful connection. 

D. The link between peers requires unicast packets. 

Answer: A,D 

Explanation: 

There are two ways we can create EIGRP neighbor relationship: 

+ Use “network ” command. This is the more popular way to create EIGRP neighbor relationship. That router will check which interfaces whose IP addresses belong to the and turn EIGRP on that interface. EIGRP messages are sent via multicast packets. 

+ Use “neighbor” commanD. The interface(s) that have this command applied no longer send or receive EIGRP multicast packets. EIGRP messages are sent via unicast. The router only accepts EIGRP packets from peers that are explicitly configured with a neighbor statement. Consequently, any messages coming from routers without a corresponding neighbor statement are discarded. This helps prevent the insertion of unauthorized routing peers -> A and D are correct. 

Q432. What is the maximum number of secondary IP addresses that can be configured on a router interface? 

A. 1 

B. 2 

C. 4 

D. 1024 

E. 65535 

F. no limit to the number of addresses 

Answer:

Explanation: 

From “IP Routing Frequently Asked Questions” 

Q. What are the maximum number of secondary IP addesses that can be configured on a router interface? 

.A. There are no limits on configuring secondary IP addresses on a router interface. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/28745-44.html#q21 

Q433. Refer to the exhibit. 

Which action must you take to enable the WAN link to function properly? 

A. Enter a clock rate on the DCE interface. 

B. Enter a clock rate on the DTE interface. 

C. Enter a compression algorithm on both interfaces. 

D. Configure both interfaces for HDLC encapsulation. 

Answer:

Explanation: 

When connecting a serial cable to the serial interface of the router, clocking is provided by an external device, such as a CSU/DSU device. A CSU/DSU (Channel Service Unit/Data Service Unit) is a digital-interface device used to connect a router to a digital circuit. The router is the DTE (Data Terminal Equipment) and the external device is the DCE (Data Communications Equipment), where the DCE provides the clocking. However, in some cases we might connect two routers back-to-back using the routers’ serial interfaces (Example. Inside the router labs). Each router is a DTE by default. Since clocking is required to enable the interface, one of the two routers should function as DCE and should provide clocking. This can be done by using the "clock rate" command, from the interface configuration mode. 

Reference: http://www.omnisecu.com/cisco-certified-network-associate-ccna/how-to-configure-router-serial-interfaces.php 

Q434. Which two protocols does the Management Plane Protection feature support? (Choose two.) 

A. ARP 

B. HTTPS 

C. TFTP 

D. OSPF 

Answer: B,C 

Q435. RIPv2 is enabled on a router interface. The "neighbor" command is also configured with a specific IP address. Which statement describes the effect of this configuration? 

A. RIP stops sending multicast packets on that interface. 

B. RIP starts sending only unicast packets on that interface. 

C. RIP starts ignoring multicast packets on that interface. 

D. RIP starts sending unicast packets to the specified neighbor, in addition to multicast packets. 

Answer:

Q436. When BGP route reflectors are used, which attribute ensures that a routing loop is not created? 

A. weight 

B. local preference 

C. multiexit discriminator 

D. originator ID 

Answer:

Explanation: 

As the iBGP learned routes are reflected, routing information may loop. The route reflector model has the following mechanisms to avoid routing loops: 

. Originator ID is an optional, nontransitive BGP attribute. It is a 4-byte attributed created by a route reflector. The attribute carries the router ID of the originator of the route in the local autonomous system. Therefore, if a misconfiguration causes routing information to come back to the originator, the information is ignored. 

. Cluster-list is an optional, nontransitive BGP attribute. It is a sequence of cluster IDs that the route has passed. When a route reflector reflects a route from its clients to nonclient peers, and vice versa, it appends the local cluster ID to the cluster-list. If the cluster-list is empty, a new cluster-list is created. Using this attribute, a route reflector can identify if routing information is looped back to the same cluster due to misconfiguration. If the local cluster ID is found in the cluster-list, the advertisement is ignored. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfbgp.html 

Q437. Refer to the exhibit. 

You must complete the configuration on R1 so that a maximum of three links can be used and fragmentation is supported. 

Which additional configuration accomplishes this task? 

A. interface Multilink19 

ip address 192.168.1.1 255.255.255.0 

ppp multilink 

ppp multilink group 19 

ppp multilink links minimum 1 

ppp multilink links maximum 3 

ppp multilink interleave 

B. interface Multilink19 

ip address 192.168.1.1 255.255.255.0 

ppp multilink 

ppp multilink group 19 

ppp multilink links maximum 3 

ppp multilink fragment delay 20 

C. interface Multilink19 

ip address 192.168.1.1 255.255.255.0 

ppp multilink 

ppp multilink group 19 

ppp multilink links maximum 3 

ppp multilink fragment delay 20 

ppp multilink interleave 

D. interface Multilink19 

ip address 192.168.1.1 255.255.255.252 

ppp multilink 

ppp multilink group 19 

ppp multilink links maximum 3 

ppp multilink interleave 

Answer:

Explanation: 

The “ppp multilink interleave” command is needed to enable link fragmentation and Interleaving (LFI). The Cisco IOS Link Fragmentation and Interleaving (LFI) feature uses Multilink PPP (MLP). MLP provides a method of splitting, recombining, and sequencing datagrams across multiple logical data links. MLP allows packets to be fragmented and the fragments to be sent at the same time over multiple point-to-point links to the same remote address. 

ppp multilink links maximum 

To limit the maximum number of links that Multilink PPP (MLP) can dial for dynamic allocation, use the ppp multilink links maximum command in interface configuration mode. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcflfi.html 

Q438. Refer to the exhibit. 

Router 1 and Router 2 use HSRP to provide first hop redundancy for hosts on the 10.1.2.0/24 network. 

Which feature can provide additional failover coverage for the PC? 

A. Cisco Express Forwarding 

B. NetFlow 

C. Accounting 

D. Enhanced Object Tracking 

Answer:

Explanation: 

HSRP has a mechanism for tracking the interface line-protocol state. The enhanced object tracking feature separates the tracking mechanism from HSRP. It creates a separate, standalone tracking process that can be used by processes other than HSRP. This feature allows tracking of other objects in addition to the interface line-protocol state. A client process, such as HSRP, can register an interest in tracking objects and request notification when the tracked object changes state. Several clients can track the same object, and can take different actions when the object changes state. This feature increases the availability and speed of recovery of a router system and decreases outages and outage duration. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/blades/3040/software/release/12-2_44_se/configuration/guide/swhsrp.html#wp1083927 

Q439. Which three features require Cisco Express Forwarding? (Choose three.) 

A. NBAR 

B. AutoQoS 

C. fragmentation 

D. MPLS 

E. UplinkFast 

F. BackboneFast 

Answer: A,B,D 

Explanation: 

QoS Features That Require CEF 

These class-based QoS features are supported only on routers that run CEF. 

.Network Based Application Recognition (NBAR) provides intelligent network classification. For more information, refer to Network Based Application Recognition. 

. The AutoQoS -VoIP feature simplifies and speeds up the implementation and provisioning of QoS for VoIP traffic. This feature is enabled with the help of the auto qos voip command. CEF must be enabled at the interface or ATM PVC before the auto qos command can be used. For more information about this feature and its prerequisites, refer to AutoQoS -VoIP. 

From MPLS Fundamentals – Luc De Ghein 

Why Is CEF Needed in MPLS Networks? 

Concerning MPLS, CEF is special for a certain reason; otherwise, this book would not explicitly cover it. Labeled packets that enter the router are switched according to the label forwarding information base (LFIB) on the router. IP packets that enter the router are switched according to the CEF table on the router. Regardless of whether the packet is switched according to the LFIB or the CEF table, the outgoing packet can be a labeled packet or an IP packet 

Reference: http://www.cisco.com/c/en/us/support/docs/asynchronous-transfer-mode-atm/ip-to-atm-class-of-service/4800-cefreq.html 

Q440. Which neighbor-discovery message type is used to verify connectivity to a neighbor when the link-layer address of the neighbor is known? 

A. neighbor solicitation 

B. neighbor advertisement 

C. router advertisement 

D. router solicitation 

Answer:

Explanation: 

IPv6 Neighbor Solicitation Message A value of 135 in the Type field of the ICMP packet header identifies a neighbor solicitation message. Neighbor solicitation messages are sent on the local link when a node wants to determine the link-layer address of another node on the same local link (see the figure below). When a node wants to determine the link-layer address of another node, the source address in a neighbor solicitation message is the IPv6 address of the node sending the neighbor solicitation message. The destination address in the neighbor solicitation message is the solicited-node multicast address that corresponds to the IPv6 address of the destination node. The neighbor solicitation message also includes the link-layer address of the source node. 

Figure 1. IPv6 Neighbor Discovery: Neighbor Solicitation Message 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-3s/ip6b-xe-3s-book/ip6-neighb-disc-xe.html 

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