★ Pass on Your First TRY ★ 100% Money Back Guarantee ★ Realistic Practice Exam Questions
Free Instant Download NEW 400-101 Exam Dumps (PDF & VCE):
Available on:
https://www.certleader.com/400-101-dumps.html
Exam Code: 400-101 (Practice Exam Latest Test Questions VCE PDF)
Exam Name: CCIE Routing and Switching (v5.0)
Certification Provider: Cisco
Free Today! Guaranteed Training- Pass 400-101 Exam.
2021 Apr 400-101 practice question
Q351. Refer to the exhibit.
This network is configured with PIM, and the RPF check has failed toward the multicast source. Which two configuration changes must you make to router R3 to enable the RPF check to pass? (Choose two.)
A. Configure a static multicast route to the multicast source through the tunnel interface.
B. Configure a static multicast route to the multicast source LAN through the tunnel interface.
C. Configure a static multicast route to the multicast source LAN through the Ethernet interface.
D. Remove the command ip prim bidir-enable from the R3 configuration.
Answer: A,B
Q352. Refer to the exhibit.
Why is the router not accessible via Telnet on the GigabitEthernet0 management interface?
A. The wrong port is being used in the telnet-acl access list.
B. The subnet mask is incorrect in the telnet-acl access list.
C. The log keyword needs to be removed from the telnet-acl access list.
D. The access class needs to have the vrf-also keyword added.
Answer: D
Explanation:
The correct command should be “access-class telnet-acl in vrf-also”. If you do not specify the vrf-also keyword, incoming Telnet connections from interfaces that are part of a VRF are rejected.
Q353. How is the MRU for a multilink bundle determined?
A. It is negotiated by LCP.
B. It is manually configured on the multilink bundle.
C. It is manually configured on all physical interfaces of a multilink bundle.
D. It is negotiated by NCP.
E. It is negotiated by IPCP.
Answer: A
Q354. Which two options are reasons to manipulate the delay metric instead of the bandwidth metric for EIGRP routing? (Choose two.)
A. Because the delay metric provides better handling for bursty traffic
B. Because manipulating the bandwidth metric can also affect QoS
C. Because manipulating the bandwidth affects only a particular path
D. Because changes to the delay metric are propagated to all neighbors on a segment
Answer: B,D
Explanation:
Using the bandwidth to influence EIGRP paths is discouraged for two reasons:
. Changing the bandwidth can have impact beyond affecting the EIGRP metrics. For example, quality of service (QoS) also looks at the bandwidth on an interface.
. EIGRP throttles to use 50 percent of the configured bandwidth. Lowering the bandwidth can cause problems like staving EIGRP neighbors from getting hello packets because of the throttling back.
Because changes to the delay metric are propagated to all downstream routers, changing the interface delay parameter is the preferred method of influencing path selection
Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13673-14.html
Q355. Which three statements about bridge assurance are true? (Choose three.)
A. Bridge assurance must be enabled on both ends of a link.
B. Bridge assurance can be enabled on one end of a link or on both ends.
C. Bridge assurance is enabled on STP point-to-point links only.
D. Bridge assurance is enabled on STP multipoint links only.
E. If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into a blocking state.
F. If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into an error disabled state.
Answer: A,C,E
Explanation:
Bridge Assurance is enabled by default and can only be disabled globally. Also, Bridge Assurance can be enabled only on spanning tree network ports that are point-to-point links.
Finally, both ends of the link must have Bridge Assurance enabled.
With Bridge Assurance enabled, BPDUs are sent out on all operational network ports, including alternate and backup ports, for each hello time period. If the port does not receive a BPDU for a specified period, the port moves into the blocking state and is not used in the root port calculation. Once that port receives a BPDU, it resumes the normal spanning tree transitions.
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guid e/cli/CLIConfigurationGuide/SpanningEnhanced.html
Up to the immediate present 400-101 testing engine:
Q356. Refer to the exhibit.
All switches have default bridge priorities, and originate BPDUs with MAC addresses as indicated. The numbers shown are STP link metrics. Which two ports are forwarding traffic after STP converges? (Choose two.)
A. The port connecting switch SWD with switch SWE
B. The port connecting switch SWG with switch SWF
C. The port connecting switch SWC with switch SWE
D. The port connecting switch SWB with switch SWC
Answer: C,D
Explanation:
Here, we know SWB to SWC are forwarding because we already identified the blocking port. So for the last correct answer let’s consider what must be done to prevent a switch loop between SWC/SWD/SWE. SWE to SWD will be blocked because SWC has a lower MAC address so it wins the forwarding port. And to look at it further, you could try to further understand what would happen with ports on SWG. Would the ports on SWG try to go through SWE or SWF? SWE has the lower MAC address so the port from SWG to SWE would win the forwarding election. Therefore, answer B could never be correct.
Q357. Which three features require Cisco Express Forwarding? (Choose three.)
A. NBAR
B. AutoQoS
C. fragmentation
D. MPLS
E. UplinkFast
F. BackboneFast
Answer: A,B,D
Explanation:
QoS Features That Require CEF
These class-based QoS features are supported only on routers that run CEF.
.Network Based Application Recognition (NBAR) provides intelligent network classification. For more information, refer to Network Based Application Recognition.
. The AutoQoS -VoIP feature simplifies and speeds up the implementation and provisioning of QoS for VoIP traffic. This feature is enabled with the help of the auto qos voip command. CEF must be enabled at the interface or ATM PVC before the auto qos command can be used. For more information about this feature and its prerequisites, refer to AutoQoS -VoIP.
From MPLS Fundamentals - Luc De Ghein
Why Is CEF Needed in MPLS Networks?
Concerning MPLS, CEF is special for a certain reason; otherwise, this book would not explicitly cover it. Labeled packets that enter the router are switched according to the label forwarding information base (LFIB) on the router. IP packets that enter the router are switched according to the CEF table on the router. Regardless of whether the packet is switched according to the LFIB or the CEF table, the outgoing packet can be a labeled packet or an IP packet
Reference: http://www.cisco.com/c/en/us/support/docs/asynchronous-transfer-mode-atm/ip-to-atm-class-of-service/4800-cefreq.html
Q358. Which two options are signaling protocols that are used in MPLS? (Choose two.)
A. LDP
B. RSVP
C. BFD
D. LISP
E. CLNS
F. CDP
Answer: A,B
Explanation:
* Signaling is the means by which LSRs all along the path know that they are a part of a given LSP. It is a signaling function by which the LSR knows that the internal transit path for the LSP depicted goes from Interface 2 to Interface 4.
* Label distribution is the means by which an LSR tells an upstream LSR what label value to use for a particular LSP.
There are four protocols that can perform the label distribution function:
* Label Distribution Protocol (LDP)
* Resource Reservation Protocol with Traffic Engineering Extensions (RSVP-TE)
* Constraint-Based Routed LDP (CR-LDP)
* Multiprotocol BGP
LDP and RSVP-TE are the two most commonly used label distribution protocols
Reference: http://www.networkworld.com/article/2237487/cisco-subnet/understanding-mpls-label-distribution.html
Q359. Which two statements about IBGP multipath are true? (Choose two.)
A. The IGP metric of the BGP next hop can be different from the best-path IGP metric if you configure the router for unequal-cost IBGP multipath.
B. The IGP metric of the BGP next hop must be the same as the best-path IGP metric.
C. The equivalent next-hop-self is performed on the best path from among the IBGP multipaths before it is forwarded to external peers.
D. The path should be learned from an external neighbor.
E. The router BGP process must learn the path from a confederation-external or external neighbor.
F. The router BGP process must learn the path from an internal neighbor.
Answer: A,F
Q360. Refer to the exhibit.
IPv6 SLAAC clients that are connected to the router are unable to acquire IPv6 addresses. What is the reason for this issue?
A. Router advertisements are not sent by the router.
B. Duplicate address detection is disabled but is required on multiaccess networks.
C. The interface is configured to support DHCPv6 clients only.
D. The configured interface MTU is too low for IPv6 to be operational.
Answer: A