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 Dec ccie written exam:

Q561. Which two statements about Inverse ARP are true? (Choose two.) 

A. It uses the same operation code as ARP. 

B. It uses the same packet format as ARP. 

C. It uses ARP stuffing. 

D. It supports static mapping. 

E. It translates Layer 2 addresses to Layer 3 addresses. 

F. It translates Layer 3 addresses to Layer 2 addresses. 

Answer: B,E 


Inverse Address Resolution Protocol (Inverse ARP or InARP) is used to obtain Network Layer addresses (for example, IP addresses) of other nodes from Data Link Layer (Layer 2) addresses. It is primarily used in Frame Relay (DLCI) and ATM networks, in which Layer 2 addresses of virtual circuits are sometimes obtained from Layer 2 signaling, and the corresponding Layer 3 addresses must be available before those virtual circuits can be used. 

Since ARP translates Layer 3 addresses to Layer 2 addresses, InARP may be described as its inverse. In addition, InARP is implemented as a protocol extension to ARP: it uses the same packet format as ARP, but different operation codes. 

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


Drag and drop the router preference on the left to the correct routing sequence (from most preferred to least preferred) on the right. 


Q563. Refer to the exhibit. 

If the route to is removed from the R2 routing table, which server becomes the master NTP server? 

A. R2 

B. the NTP server at 

C. the NTP server at 

D. the NTP server with the lowest stratum number 



NTP uses a concept called “stratum” that defines how many NTP hops away a device is from an authoritative time source. For example, a device with stratum 1 is a very accurate device and might have an atomic clock attached to it. Another NTP server that is using this stratum 1 server to sync its own time would be a stratum 2 device because it’s one NTP hop further away from the source. When you configure multiple NTP servers, the client will prefer the NTP server with the lowest stratum value. 

Reference: https://networklessons.com/network-services/cisco-network-time-protocol-ntp/ 


Drag and drop the IPv6 multicast feature or protocol on the left to the correct address space on the right. 


Q565. Which statement about OSPF multiaccess segments is true? 

A. The designated router is elected first. 

B. The designated and backup designated routers are elected at the same time. 

C. The router that sent the first hello message is elected first. 

D. The backup designated router is elected first. 



According to the RFC, the BDR is actually elected first, followed by the DR. The RFC explains why: “The reason behind the election algorithm’s complexity is the desire for an orderly transition from Backup Designated Router to Designated Router, when the current Designated Router fails. This orderly transition is ensured through the introduction of hysteresis: no new Backup Designated Router can be chosen until the old Backup accepts its new Designated Router responsibilities. The above procedure may elect the same router to be both Designated Router and Backup Designated Router, although that router will never be the calculating router (Router X) itself.” 

Reference: http://www.ietf.org/rfc/rfc2328.txt – Page 76 

Latest 400-101 ccie dumps free download:

Q566. Which two statements about IP SLAs are true? (Choose two.) 

A. They are Layer 2 transport independent. 

B. Statistics are collected and stored in the RIB. 

C. Data for the delay performance metric can be collected both one-way and round-trip. 

D. Data can be collected with a physical probe. 

E. They are used primarily in the distribution layer. 

Answer: A,E 

Q567. Which two statements about the C-bit and PW type are true? (Choose two.) 

A. The C-bit is 1 byte and the PW type is 15 bytes. 

B. The PW type indicates the type of pseudowire. 

C. The C-bit is 3 bits and the PW type is 10 bits. 

D. The C-bit set to 1 indicates a control word is present. 

E. The PW type indicates the encryption type. 

Answer: B,D 


The control word carries generic and Layer 2 payload-specific information. If the C-bit is set to 1, the advertising PE expects the control word to be present in every pseudowire packet on the pseudowire that is being signaled. If the C-bit is set to 0, no control word is expected to be present. Pseudowire Type—PW Type is a 15-bit field that represents the type of pseudowire. 

Reference: http://www.ciscopress.com/articles/article.asp?p=386788&seqNum=2 

Q568. Which statement about passive interfaces is true? 

A. The interface with the OSPF passive interface configuration appears as a not-so-stubby network. 

B. The interface with the EIGRP passive interface configuration ignores routes after the exchange of hello packets. 

C. The interface with the IS-IS passive interface configuration sends the IP address of that interface in the link-state protocol data units. 

D. Passive interface can be configured on the interface for IS-IS. 



With IS-IS, passive interfaces are used to prevent unnecessary LSA packets out that interface, but the IP address of passive interfaces are still included in updates going out the other interfaces. This behavior is what enables the best practice of configuring loopback interfaces as passive, but still having the loopback be reachable. 

Q569. Which statement about Cisco Discovery Protocol is true? 

A. The multicast address 0100.0cdd.dddd is used as the destination address for periodic advertisements. 

B. An inactive VLAN that is configured on an access port passes periodic Cisco Discovery Protocol advertisements. 

C. The multicast address 0100.0ccc.ccd is used as the destination address for periodic advertisements. 

D. A VLAN must be active on an access port before periodic Cisco Discovery Protocol advertisements are passed. 



All CDP packets include a VLAN ID. If you configure CDP on a Layer 2 access port, the CDP packets sent from that access port include the access port VLAN ID. If you configure CDP on a Layer 2 trunk port, the CDP packets sent from that trunk port include the lowest configured VLAN ID allowed on that trunk port. CDP messages on the active physical interfaces (Ethernet NIC) to a well-known multicast address (0100.0CCC.CCCC. 

Q570. Refer to the exhibit. 

A PE router is configured with a policy map that contains the policer shown. The policy map is configured in the inbound direction of an interface facing a CE router. If the PE router 

receives 12Mb/s of traffic with the CoS value set to 7 on a 100-Mb/s interface from the CE router, what value of MPLS EXP is set when this traffic goes through the policer shown? 

A. 0 

B. 6 

C. 7 

D. 8 



Here, the policer is set where the conforming traffic is set to 10 percent of the 100 Mbps interface, so anything more than 10 Mbps will be placed into the exceeding traffic class, the traffic EXP value will be changed from 7 to 6 per the configuration. 

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