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It is impossible to pass Cisco 400-101 exam without any help in the short term. Come to Actualtests soon and find the most advanced, correct and guaranteed Cisco 400-101 practice questions. You will get a surprising result by our Refresh CCIE Routing and Switching (v5.0) practice guides.

2021 Nov latest ccie r&s dumps:

Q381. Which protocol uses a proprietary 2-byte Type field for multiple protocol support? 

A. HDLC 

B. PPP 

C. CHAP 

D. PAP 

Answer: A 


Q382. Which cache aggregation scheme is supported by NetFlow ToS-based router aggregation? 

A. prefix-port 

B. AS 

C. protocol port 

D. destination prefix 

Answer: A 


Q383. Which two statements about IPv4 and IPv6 networks are true? (Choose two.) 

A. In IPv6, hosts perform fragmentation. 

B. IPv6 uses a UDP checksum to verify packet integrity. 

C. In IPv6, routers perform fragmentation. 

D. In IPv4, fragmentation is performed by the source of the packet. 

E. IPv4 uses an optional checksum at the transport layer. 

F. IPv6 uses a required checksum at the network layer. 

Answer: A,B 


Q384. DRAG DROP 

Drag and Drop Cisco PFR adjacency types. 

Answer: 


Q385. Which three statements about EIGRP and BFD are true? (Choose three.) 

A. BFD is independent of the routing protocol, so it can be used as a generic failure detection mechanism for EIGRP. 

B. Some parts of BFD can be distributed to the data plane, so it can be less CPU-intensive than reduced timers, which exist wholly at the control plane. 

C. Reduced EIGRP timers have an absolute minimum detection timer of 1-2 seconds; BFD can provide sub-second failure detection. 

D. BFD is tied to specific routing protocols and can be used for generic fault detection for the OSPF, EIGRP, and BGP routing protocols. 

E. BFD is dependent on the EIGRP routing protocol, so it can be used as a specific failure detection mechanism. 

F. BFD resides on the control plane, so it is less CPU-intensive than if it resided on the data plane. 

Answer: A,B,C 

Explanation: 

There are several advantages to implementing BFD over reduced timer mechanisms for routing protocols: 

. Although reducing the EIGRP, IS-IS, and OSPF timers can result in minimum detection timer of one to two seconds, BFD can provide failure detection in less than one second. 

. Because BFD is not tied to any particular routing protocol, it can be used as a generic and consistent failure detection mechanism for EIGRP, IS-IS, and OSPF. 

. Because some parts of BFD can be distributed to the data plane, it can be less CPU-intensive than the reduced EIGRP, IS-IS, and OSPF timers, which exist wholly at the control plane. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html 


Abreast of the times 400-101 ccie written exam number:

Q386. 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: C 

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 


Q387. Which technology is not necessary to set up a basic MPLS domain? 

A. IP addressing 

B. an IGP 

C. LDP or TDP 

D. CEF 

E. a VRF 

Answer: E 

Explanation: 

The simplest form of VRF implementation is VRF Lite. In this implementation, each router within the network participates in the virtual routing environment in a peer-based fashion. While simple to deploy and appropriate for small to medium enterprises and shared data centres, VRF Lite does not scale to the size required by global enterprises or large carriers, as there is the need to implement each VRF instance on every router, including intermediate routers. VRFs were initially introduced in combination with MPLS, but VRF proved to be so useful that it eventually evolved to live independent of MPLS. This is the historical explanation of the term VRF Lite. Usage of VRFs without MPLS. 

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


Q388. How does MSTP provide backward compatibility with RSTP? 

A. It uses the hop count variable as a TTL counter. 

B. It transmits all spanning-tree information in one BPDU. 

C. It supports up to 128 MSTI messages. 

D. It encodes the MSTP-specific region information before the legacy RSTP BPDU. 

Answer: D 


Q389. Which three improvements does Cisco IOS XE Software offer over traditional IOS Software? (Choose three.) 

A. It can run applications as separate processes on multicore CPUs. 

B. It supports drivers for data plane ASICs outside of the operating system. 

C. It allows platform-dependent code to be compiled into a single image. 

D. It supports multiple IOS instances simultaneously, sharing resources and internal infrastructure for scalability. 

E. It allows platform-independent code to be abstracted into a single microkernel for portability across platforms. 

F. It uses a QNX Neutrino-based environment underneath the IOS Software. 

Answer: A,B,C 


Q390. Which two modes of operation does BFD support? (Choose two.) 

A. synchronous mode 

B. asynchronous mode 

C. demand mode 

D. echo mode 

E. aggressive mode 

F. passive mode 

Answer: B,C 

Explanation: 

A session may operate in one of two modes: asynchronous mode and demand mode. In 

asynchronous mode, both endpoints periodically send Hello packets to each other. If a number of those packets are not received, the session is considered down. In demand mode, no Hello packets are exchanged after the session is established; it is assumed that the endpoints have another way to verify connectivity to each other, perhaps on the underlying physical layer. However, either host may still send Hello packets if needed. 

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