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2021 Jul ccie dumps 400-101:
Q101. Which two statements about BGP best-path selection are true? (Choose two.)
A. The route with the highest local preference is preferred.
B. The weight attribute is advertised to peers.
C. The route with the lowest MED is preferred.
D. A route that originates from iBGP peers is preferred.
E. A route that originates from a router with a higher BGP router ID is preferred.
F. The lowest weight advertised is preferred.
Answer: A,C
Q102. Consider an OSPFv3 network with four parallel links between each pair of routers. Which measure can you use to reduce the CPU load and at the same time keep all links available for ECMP?
A. Configure some interfaces as passive interface.
B. Configure ipv6 ospf priority 0 on some interfaces.
C. Configure some routers with a distribute list in ingress of the OSPFv3 process.
D. Configure ipv6 ospf database-filter all out on some interfaces.
Answer: D
Explanation:
To filter outgoing link-state advertisements (LSAs) to an Open Shortest Path First version 3 (OSPFv3) interface, use the ipv6 ospf database-filter all out command in interface configuration mode. This can be done on some of the links to reduce the CPU load while still ensuring that all links in the equal cost path are still being used.
Q103. Which statement is true regarding UDLD and STP timers?
A. The UDLD message timer should be two times the STP forward delay to prevent loops.
B. UDLD and STP are unrelated features, and there is no relation between the timers.
C. The timers need to be synced by using the spanning-tree udld-sync command.
D. The timers should be set in such a way that UDLD is detected before the STP forward delay expires.
Answer: D
Explanation:
UDLD is designed to be a helper for STP. Therefore, UDLD should be able to detect an unidirectional link before STP would unblock the port due to missed BPDUs. Thus, when you configure UDLD timers, make sure your values are set so that unidirectional link is detected before “STP MaxAge + 2xForwardDelay” expires.
Reference: http://blog.ine.com/tag/stp/
Q104. Which two statements about the assert process in LAN-based PIM are true? (Choose two.)
A. If the metrics are the same, the router with the lowest advertised routing protocol metric for that route is elected.
B. If the metrics are the same, the router with the highest IP address on the LAN is elected.
C. If the metrics are the same, the router with the highest advertised routing protocol metric for that route is elected.
D. If the metrics are the same, the router with the lowest IP address on the LAN is elected.
Answer: A,B
Q105. Under Cisco IOS Software, which two features are supported in RADIUS Change of Authorization requests? (Choose two.)
A. session identification
B. session reauthentication
C. session termination
D. host termination
Answer: A,C
Explanation:
CoA requests, as described in RFC 5176, are used in a pushed model to allow for session identification, host reauthentication, and session termination. The model comprises one request (CoA-Request) and two possible response codes.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_aaa/configuration/15-sy/sec-usr-aaa-15-sy-book/sec-rad-coa.html
Most recent latest ccie r&s dumps:
Q106. 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: D
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
Q107. An engineer has configured a router to use EUI-64, and was asked to document the IPv6 address of the router. The router has the following interface parameters:
mac address C601.420F.0007
subnet 2001:DB8:0:1::/64
A. 2001:DB8:0:1:C601:42FF:FE0F:7
B. 2001:DB8:0:1:FFFF:C601:420F:7
C. 2001:DB8:0:1:FE80:C601:420F:7
D. 2001:DB8:0:1:C601:42FE:800F:7
Answer: A
Q108. Refer to the exhibit.
Which two statements about this configuration are true? (Choose two.)
A. Pings from SW2 to SW1 fail because SW1 is pruning VLAN 10.
B. VLANs 10 and 200 are added to the SW2 allowed list on interface fa0/22.
C. Pings from SW2 to SW1 are successful.
D. Only VLAN 200 is added to the SW1 allowed list on interface fa0/22.
Answer: B,C
Q109. Which three components comprise the structure of a pseudowire FEC element? (Choose three.)
A. pseudowire ID
B. pseudowire type
C. control word
D. Layer 3 PDU
E. header checksum
F. type of service
Answer: A,B,C
Explanation:
The Pseudowire ID FEC element has the following components:
. Pseudowire ID FEC — The first octet has a value of 128 that identifies it as a Pseudowire ID FEC element.
. Control Word Bit (C-Bit) — The C-bit indicates whether the advertising PE expects the control word to be present for pseudowire packets. A control word is an optional 4-byte field located between the MPLS label stack and the Layer 2 payload in the pseudowire packet. 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. Examples of pseudowire types are shown in Table 6-1.
. Pseudowire Information Length — Pseudowire Information Length is the length of the Pseudowire ID field and the interface parameters in octets. When the length is set to 0, this FEC element stands for all pseudowires using the specified Group ID. The Pseudowire ID and Interface Parameters fields are not present.
. Group ID — The Group ID field is a 32-bit arbitrary value that is assigned to a group of pseudowires.
. Pseudowire ID — The Pseudowire ID, also known as VC ID, is a non-zero, 32-bit identifier that distinguishes one pseudowire from another. To connect two attachment circuits through a pseudowire, you need to associate each one with the same Pseudowire ID.
. Interface Parameters — The variable-length Interface Parameters field provides attachment circuit-specific information, such as interface MTU, maximum number of concatenated ATM cells, interface description, and so on.
Reference: http://www.ciscopress.com/articles/article.asp?p=386788&seqNum=2
Q110. Refer to the exhibit.
Which statement about this COS-DSCP mapping is true?
A. The expedited forwarding DSCP is mapped to COS 3.
B. COS 16 is mapped to DSCP 2.
C. The default COS is mapped to DSCP 32.
D. This mapping is the default COS-DSCP mapping on Cisco switches.
Answer: A
Explanation:
Here we see that COS 3 is mapped to DSCP 46, which is the Expedited forwarding class: The Expedited Forwarding (EF) model is used to provide resources to latency (delay) sensitive real-time, interactive traffic. The EF model uses one marking -- DSCP 46.