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Q331. DRAG DROP 

Drag and drop the Cisco IOS XE subpackage on the left to the function it performs on the right. 

Answer: 


Q332. Which three statements are true about PPP CHAP authentication? (Choose three.) 

A. PPP encapsulation must be enabled globally. 

B. The LCP phase must be complete and in closed state. 

C. The hostname used by a router for CHAP authentication cannot be changed. 

D. PPP encapsulation must be enabled on the interface. 

E. The LCP phase must be complete and in open state. 

F. By default, the router uses its hostname to identify itself to the peer. 

Answer: D,E,F 

Explanation: 

Point-to-Point Protocol (PPP) authentication issues are one of the most common causes for dialup link failures. This document provides some troubleshooting procedures for PPP authentication issues. 

Prerequisites 

. Enable PPP encapsulation 

. The PPP authentication phase does not begin until the Link Control Protocol (LCP) phase is complete and is in the open state. If debug ppp negotiation does not indicate that LCP is open, troubleshoot this issue before proceeding. 

Note. By default, the router uses its hostname to identify itself to the peer. However, this CHAP username can be changed through the ppp chap hostname command. 

Reference: http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25647-understanding-ppp-chap.html 


Q333. 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:


Q334. Which two statements about the function of a PIM designated router are true? (Choose two.) 

A. It forwards multicast traffic from the source into the PIM network. 

B. It registers directly connected sources to the PIM rendezvous point. 

C. It sends PIM Join/Prune messages for directly connected receivers. 

D. It sends IGMP queries. 

E. It sends PIM asserts on the interfaces of the outgoing interface list. 

Answer: B,C 

Explanation: 

In PIM ASM and SSM modes, the software chooses a designated router (DR) from the routers on each network segment. The DR is responsible for forwarding multicast data for specified groups and sources on that segment. In ASM mode, the DR is responsible for unicasting PIM register packets to the RP. When a DR receives an IGMP membership report from a directly connected receiver, the shortest path is formed to the RP, which may or may not go through the DR. The result is a shared tree that connects all sources transmitting on the same multicast group to all receivers of that group. In SSM mode, the DR triggers (*, G) or (S, G) PIM join messages toward the RP or the source. The path from the receiver to the source is determined hop by hop. The source must be known to the receiver or the DR. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/multicast/configuration/guide/n7k_multic_cli_5x/pim.html#wp1054047 


Q335. Which two features are used for inspection when IPv6 address glean is enabled? (Choose two.) 

A. DHCP messages 

B. ND messages 

C. ICMPv6 messages 

D. UDP messages 

E. TCP messages 

Answer: A,B 

Explanation: 

IPv6 address glean is the foundation for many other IPv6 features that depend on an accurate binding table. It inspects ND and DHCP messages on a link to glean addresses, and then populates the binding table with these addresses. This feature also enforces address ownership and limits the number of addresses any given node is allowed to claim. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/15-s/ip6f-15-s-book/ip6-snooping.html 


Replace 400-101 dumps:

Q336. Refer to the exhibit. 

You are configuring the S1 switch for the switchport connecting to the client computer. Which option describes the effect of the command mls qos map cos-dscp 0 8 16 24 32 40 46 56? 

A. Voice traffic is excluded from the default priority queue. 

B. Voice packets are given a class selector of 5. 

C. Video conferencing is marked CS3. 

D. Voice packets are processed in the priority queue. 

Answer:

Explanation: 

The default CoS to DSCP mappings are shown below: 

Default CoS-to-DSCP Map 

CoS Value 

DSCP Value 

16 

24 

32 

40 

48 

56 

In our example, we see that COS 6 is mapped to DSCP, not the default of DSCP 48 as shown above. DSCP 46 is Expedited Forwarding (EF), which is typically used for voice traffic, and this value has not been included in this class map. 


Q337. Which technology facilitates neighbor IP address resolution in DMVPN? 

A. CEF 

B. mGRE 

C. a dynamic routing protocol 

D. NHRP 

Answer:

Explanation: 

NHRP Used with a DMVPN 

NHRP is used to facilitate building a VPN and provides address resolution in DMVPN. In this context, a VPN consists of a virtual Layer 3 network that is built on top of an actual Layer 3 network. The topology you use over the VPN is largely independent of the underlying network, and the protocols you run over it are completely independent of it. The VPN network (DMVPN) is based on GRE IP logical tunnels that can be protected by adding in IPsec to encrypt the GRE IP tunnels. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html#w p1057255 


Q338. Which two events occur when a packet is decapsulated in a GRE tunnel? (Choose two.) 

A. The destination IPv4 address in the IPv4 payload is used to forward the packet. 

B. The TTL of the payload packet is decremented. 

C. The source IPv4 address in the IPv4 payload is used to forward the packet. 

D. The TTL of the payload packet is incremented. 

E. The version field in the GRE header is incremented. 

F. The GRE keepalive mechanism is reset. 

Answer: A,B 

Explanation: 

After the GRE encapsulated packet reaches the remote tunnel endpoint router, the GRE packet is decapsulated. The destination address lookup of the outer IP header (this is the same as the tunnel destination address) will find a local address (receive) entry on the ingress line card. The first step in GRE decapsulation is to qualify the tunnel endpoint, before admitting the GRE packet into the router, based on the combination of tunnel source (the same as source IP address of outer IP header) and tunnel destination (the same as destination IP address of outer IP header). If the received packet fails tunnel admittance qualification check, the packet is dropped by the decapsulation router. On successful tunnel admittance check, the decapsulation strips the outer IP and GRE header off the packet, then starts processing the inner payload packet as a regular packet. When a tunnel endpoint decapsulates a GRE packet, which has an IPv4/IPv6 packet as the payload, the destination address in the IPv4/IPv6 payload packet header is used to forward the packet, and the TTL of the payload packet is decremented. 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/addr-serv/configuration/guide/b-ipaddr-cg53asr9k/b-ipaddr-cg53asr9k_chapter_01001.html 


Q339. 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:


Q340. Which two Cisco IOS XE commands can install a subpackage onto a router? (Choose two.) 

A. request platform software package install rp rpSlotNumber file fileURL 

B. boot system flash bootflash:filename 

C. copy sourceUrl destinationUrl 

D. license install file storedLocationUrl 

E. issu loadversion rp identifier file diskType imageFilename 

F. config-register value 

Answer: A,C 

Explanation: 

. Managing and Configuring a Consolidated Package Using the request platform software package install Command 

In the following example, the request platform software package install command is used to upgrade a consolidated package running on RP 0. The force option, which forces the upgrade past any prompt (such as already having the same consolidated package installed), is used in this example. 

Router# request platform software package install rp 0 file bootflash:asr1000rp1-adventerprisek9.02.01.00.122-33.XNA.bin force 

To upgrade a consolidated package on the Cisco ASR 1000 Series Routers using the copy command, copy the consolidated package into the bootflash: directory on the router using the copy command as you would on most other Cisco routers. After making this copy, configure the router to boot using the consolidated package file. In the following example, the consolidated package file is copied onto the bootflash: file system from TFTP. The config-register is then set to boot using boot system commands, and the boot system commands instruct the router to boot using the consolidated package stored in the bootflash: file system. The new configuration is then saved using the copy running-config startup-config command, and the system is then reloaded to complete the process. 

Router# dir bootflash: 

Directory of bootflash:/ 

11 drwx 16384 Dec 4 2007 04:32:46 -08:00 lost+found 

86401 drwx 4096 Dec 4 2007 06:06:24 -08:00.ssh 

14401 drwx 4096 Dec 4 2007 06:06:36 -08:00.rollback_timer 

28801 drwx 4096 Mar 18 2008 17:31:17 -07:00.prst_sync 

43201 drwx 4096 Dec 4 2007 04:34:45 -08:00.installer 

13 -rw- 45977 Apr 9 2008 16:48:46 -07:00 target_support_output.tgz.tgz 

928862208 bytes total (712273920 bytes free) 

Router# copy tftp bootflash: 

Address or name of remote host []? 172.17.16.81 

Source filename []? /auto/tftp-users/user/asr1000rp1-adventerprisek9.02.01.00.122-33.XNA.bin 

Destination filename [asr1000rp1-adventerprisek9.02.01.00.122-33.XNA.bin]? 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/chassis/asrswcfg /Package_Management.html#78189