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Q561. Which technology facilitates dynamic tunnel establishment in DMVPN? 

A. CEF 

B. mGRE 

C. a dynamic routing protocol 

D. NHRP 

Answer:


Q562. Which statement about the RPF interface in a BIDIR-PIM network is true? 

A. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the PIM rendezvous point. 

B. In a BIDIR-PIM network, the RPF interface can be the interface that is used to reach the PIM rendezvous point or the interface that is used to reach the source. 

C. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the source. 

D. There is no RPF interface concept in BIDIR-PIM networks. 

Answer:

Explanation: 

RPF stands for "Reverse Path Forwarding". The RPF Interface of a router with respect to an address is the interface that the MRIB indicates should be used to reach that address. In the case of a BIDIR-PIM multicast group, the RPF interface is determined by looking up the Rendezvous Point Address in the MRIB. The RPF information determines the interface of the router that would be used to send packets towards the Rendezvous Point Link for the group. 

Reference: https://tools.ietf.org/html/rfc5015 


Q563. DRAG DROP 

Drag and drop the argument of the mpls ip cef load-sharing command on the left to the function it performs on the right. 

Answer: 


Q564. Refer to the exhibit. 

Which statement is true? 

A. The output shows an IPv6 multicast address with link-local scope. 

B. The output shows an IPv6 multicast address that is used for unique local sources only. 

C. The output shows an IPv6 multicast address that can be used for BIDIR-PIM only. 

D. The output shows an IPv6 multicast address with embedded RP. 

Answer:


Q565. Which option describes the effect of the OSPF default-information originate always command? 

A. It creates a stub area. 

B. It configures the device to advertise a default route regardless of whether it exists in the routing table. 

C. It configures the device to automatically redistribute a default route. 

D. It adds a static default route to the device configuration. 

Answer:

Explanation: 

default-information originate 

To generate a default external route into an Open Shortest Path First (OSPF) routing domain, use the default-information originate command in router configuration mode. To disable this feature, use the no form of this command. 

default-information originate [always] metric metric-value [ metric-type type-value ] [ route-map map-name ] 

Syntax Description 

always (Optional) Always advertises the default route regardless of whether the software has a default route. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/command/ipv6-cr-book/ipv6-d2.html 


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Q566. Which statement is true about conditional advertisements? 

A. Conditional advertisements create routes when a predefined condition is met. 

B. Conditional advertisements create routes when a predefined condition is not met. 

C. Conditional advertisements delete routes when a predefined condition is met. 

D. Conditional advertisements create routes and withhold them until a predefined condition is met. 

E. Conditional advertisements do not create routes, they only withhold them until a predefined condition is met. 

Answer:

Explanation: 

The Border Gateway Protocol (BGP) conditional advertisement feature provides additional control of route advertisement, depending on the existence of other prefixes in the BGP table. Normally, routes are propagated regardless of the existence of a different path. The BGP conditional advertisement feature uses the non-exist-map and the advertise-map keywords of the neighbor advertise-map command in order to track routes by the route prefix. If a route prefix is not present in output of the non-exist-map command, then the route specified by the advertise-map command is announced. This feature is useful for multihomed networks, in which some prefixes are advertised to one of the providers only if information from the other provider is not present (this indicates a failure in the peering session or partial reachability). 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/16137-cond-adv.html 


Q567. 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 


Q568. Which two statements about UDP and latency are true? (Choose two.) 

A. UDP is connection oriented, so the size of a UDP stream is independent of latency. 

B. UDP is connection oriented, so latency can increase the size of a UDP stream. 

C. UDP is connectionless, so latency can increase the size of a UDP stream. 

D. If latency decreases, throughput also decreases. 

E. If latency increases, throughput also increases. 

F. Latency can cause jitter on UDP connections. 

Answer: C,F 


Q569. Refer to the exhibit. 

If router R1 is functioning as a DHCPv6 server and you enter the command show ipv6 dhcp binding, which two options are pieces of information in the output? (Choose two.) 

A. The IA PD 

B. The DUID 

C. The prefix pool 

D. The DNS server 

E. The Rapid-Commit setting 

Answer: A,B 

Explanation: 

In the following example, the show ipv6 dhcp binding command shows information about two clients, including their DUIDs, IAPDs, prefixes, and preferred and valid lifetimes: 

Router# show ipv6 dhcp binding 

Client: FE80::202:FCFF:FEA5:DC39 (GigabitEthernet2/1/0) 

DUID. 000300010002FCA5DC1C 

IA PD. IA ID 0x00040001, T1 0, T2 0 

Prefix: 3FFE:C00:C18:11::/68 

preferred lifetime 180, valid lifetime 12345 

expires at Nov 08 2002 02:24 PM (12320 seconds) 

Client: FE80::202:FCFF:FEA5:C039 (GigabitEthernet2/1/0) 

DUID. 000300010002FCA5C01C 

IA PD. IA ID 0x00040001, T1 0, T2 0 

Prefix: 3FFE:C00:C18:1::/72 

preferred lifetime 240, valid lifetime 54321 

expires at Nov 09 2002 02:02 AM (54246 seconds) 

Prefix: 3FFE:C00:C18:2::/72 

preferred lifetime 300, valid lifetime 54333 

expires at Nov 09 2002 02:03 AM (54258 seconds) 

Prefix: 3FFE:C00:C18:3::/72 

preferred lifetime 280, valid lifetime 51111 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/xe-3s/dhcp-xe-3s-book/ip6-dhcp-prefix-xe.html 


Q570. For which feature is the address family "rtfilter" used? 

A. Enhanced Route Refresh 

B. MPLS VPN filtering 

C. Route Target Constraint 

D. Unified MPLS 

Answer:

Explanation: 

With Multiprotocol Label Switching (MPLS) VPN, the internal Border Gateway Protocol (iBGP) peer or Route Reflector (RR) sends all VPN4 and/or VPN6 prefixes to the PE routers. The PE router drops the VPN4/6 prefixes for which there is no importing VPN routing and forwarding (VRF). This is a behavior where the RR sends VPN4/6 prefixes to the PE router, which it does not need. This is a waste of processing power on the RR and the PE and a waste of bandwidth. With Route Target Constraint (RTC), the RR sends only wanted VPN4/6 prefixes to the PE. 'Wanted' means that the PE has VRF importing the specific prefixes. RFC 4684 specifies Route Target Constraint (RTC). The support is through a new address family rtfilter for both VPNv4 and VPNv6. 

Reference: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116062-technologies-technote-restraint-00.html