Cisco 400-101 ExamCCIE Routing and Switching (v5.0)

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How to pass 400-101 ccie dumps free download in Dec 2016

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2016 Dec cisco 400-101:

Q201. Which three actions are required when configuring NAT-PT? (Choose three.) 

A. Enable NAT-PT globally. 

B. Specify an IPv4-to-IPv6 translation. 

C. Specify an IPv6-to-IPv4 translation. 

D. Specify a ::/96 prefix that will map to an IPv4 address. 

E. Specify a ::/48 prefix that will map to a MAC address. 

F. Specify a ::/32 prefix that will map to an IPv6 address. 

Answer: B,C,D 

Explanation: 

The detailed steps on configuring NAY-PT is found at the reference link below: 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/i p6-nat_trnsln.html 


Q202. Which two statements describe characteristics of HDLC on Cisco routers? (Choose two.) 

A. It supports multiple Layer 3 protocols. 

B. It supports multiplexing. 

C. It supports only synchronous interfaces. 

D. It supports authentication. 

Answer: A,C 

Explanation: 

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. Cisco HDLC is the default for data encapsulation at Layer 2 (data link) of the Open System Interconnection (OSI) stack for efficient packet delineation and error control. The absence of a protocol type field in the HDLC header posed a problem for links that carried traffic from more than one Layer 3 protocol. Cisco, therefore, added an extra Type field to the HDLC header, creating a Cisco-specific version of HDLC. Cisco routers can support multiple network layer protocols on the same HDLC link. For example an HDLC link between two Cisco routers can forward both IPv4 and IPv6 packets because the Type field can identify which type of packet is carried inside each HDLC frame. 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/ 

819_SCG/6ser_conf.html#pgfId-1073734 


Q203. You are configuring a DHCPv6 client for a DHCPv6 server with the prefix delegation feature. Which option is a result of the interface configuration when you enter the command ipv6 address autoconfig default? 

A. a static IPv6 default route pointing to the upstream DHCP server 

B. a static IPv6 default route pointing to the upstream DHCP relay 

C. a static IPv6 default route pointing to the upstream router 

D. a temporary stateless address, formed from the EUI-64 bit address and the prefix from the route advertisement of the upstream router 

Answer:


Q204. What is a cause for unicast flooding? 

A. Unicast flooding occurs when multicast traffic arrives on a Layer 2 switch that has directly connected multicast receivers. 

B. When PIM snooping is not enabled, unicast flooding occurs on the switch that interconnects the PIM-enabled routers. 

C. A man-in-the-middle attack can cause the ARP cache of an end host to have the wrong MAC address. Instead of having the MAC address of the default gateway, it has a MAC address of the man-in-the-middle. This causes all traffic to be unicast flooded through the man-in-the-middle, which can then sniff all packets. 

D. Forwarding table overflow prevents new MAC addresses from being learned, and packets destined to those MAC addresses are flooded until space becomes available in the forwarding table. 

Answer:

Explanation: 

Causes of Flooding The very cause of flooding is that destination MAC address of the packet is not in the L2 forwarding table of the switch. In this case the packet will be flooded out of all forwarding ports in its VLAN (except the port it was received on). Below case studies display most common reasons for destination MAC address not being known to the switch. 

Cause 1: Asymmetric Routing 

Large amounts of flooded traffic might saturate low-bandwidth links causing network performance issues or complete connectivity outage to devices connected across such low-bandwidth links 

Cause 2: Spanning-Tree Protocol Topology Changes 

Another common issue caused by flooding is Spanning-Tree Protocol (STP) Topology Change Notification (TCN). TCN is designed to correct forwarding tables after the forwarding topology has changed. This is necessary to avoid a connectivity outage, as after a topology change some destinations previously accessible via particular ports might become accessible via different ports. TCN operates by shortening the forwarding table aging time, such that if the address is not relearned, it will age out and flooding will occur 

Cause 3: Forwarding Table Overflow 

Another possible cause of flooding can be overflow of the switch forwarding table. In this case, new addresses cannot be learned and packets destined to such addresses are flooded until some space becomes available in the forwarding table. New addresses will then be learned. This is possible but rare, since most modern switches have large enough forwarding tables to accommodate MAC addresses for most designs. 

Reference: 

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/23563-143.html 


Q205. Which two statements about proxy ARP are true? (Choose two.) 

A. It is supported on networks without ARP. 

B. It allows machines to spoof packets. 

C. It must be used on a network with the host on a different subnet. 

D. It requires larger ARP tables. 

E. It reduces the amount of ARP traffic. 

Answer: B,D 

Explanation: 

Disadvantages of Proxy ARP 

Hosts have no idea of the physical details of their network and assume it to be a flat network in which they can reach any destination simply by sending an ARP request. But using ARP for everything has disadvantages. These are some of the disadvantages: 

It increases the amount of ARP traffic on your segment. 

Hosts need larger ARP tables in order to handle IP-to-MAC address mappings. 

Security can be undermined. A machine can claim to be another in order to intercept packets, an act called "spoofing." 

It does not work for networks that do not use ARP for address resolution. 

It does not generalize to all network topologies. For example, more than one router that connects two physical networks. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocation-resolution/13718-5.html 


Up to date 400-101 cisco ccie written:

Q206. Which option is the origin code when a route is redistributed into BGP? 

A. IGP 

B. EGP 

C. external 

D. incomplete 

E. unknown 

Answer:


Q207. 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 


Q208. Refer to the exhibit. 

What is the polling frequency set by this configuration? 

A. 60 seconds 

B. 10 seconds 

C. 360 seconds 

D. 60 milliseconds 

E. 10 milliseconds 

Answer:

Explanation: 

The frequency value lists the polling interval, in seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_icmp_echo.html 


Q209. Which two statements about IS-IS wide metrics are true? (Choose two.) 

A. The wide metric is a 24-bit field. 

B. The maximum link metric is 16777215. 

C. R3 and R4 periodically advertise PNSP messages to synchronize the IS-IS database. 

D. IS-IS devices that are enabled with wide metrics can become neighbors with a device that uses standard metrics. 

E. The maximum link metric is 4261412864. 

F. The maximum path metric is 16777215. 

Answer: A,B 


Q210. Which BGP feature prevents a router from installing an iBGP learned route in its routing table until the route is validated within the IGP? 

A. confederation 

B. aggregation 

C. advertise-map 

D. synchronization 

Answer:


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