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2021 Jun 400-101 Study Guide Questions:

Q381. In which way does the Bridge Assurance mechanism modify the default spanning-tree behavior in an effort to prevent bridging loops? 

A. Received BPDUs are looped back toward the sender to ensure that the link is bidirectional. 

B. If BPDUs are no longer received on a port, the switch immediately sends out a TCN BPDU. 

C. Extended topology information is encoded into all BPDUs. 

D. BPDUs are sent bidirectional on all active network ports, including blocked and alternate ports. 

Answer: D 


Q382. DRAG DROP 

Drag and drop the NetFlow Export feature on the left to the NetFlow version that first supported it on the right. 


Answer: 



Q383. Which option describes how a VTPv3 device responds when it detects a VTPv2 device on a trunk port? 

A. It sends VTPv3 packets only. 

B. It sends VTPv2 packets only. 

C. It sends VTPv3 and VTPv2 packets. 

D. It sends a special packet that contains VTPv3 and VTPv2 packet information. 

Answer: C 

Explanation: 

When a VTP version 3 device on a trunk port receives messages from a VTP version 2 device, the VTP version 3 device sends a scaled-down version of the VLAN database on that particular trunk in a VTP version 2 format. A VTP version 3 device does not send out VTP version 2-formatted packets on a trunk port unless it first receives VTP version 2 packets on that trunk. If the VTP version 3 device does not receive VTP version 2 packets for an interval of time on the trunk port, the VTP version 3 device stops transmitting VTP version 2 packets on that trunk port. Even when a VTP version 3 device detects a VTP version 2 device on a trunk port, the VTP version 3 device continues to send VTP version 3 packets in addition to VTP version 3 device 2 packets, to allow two kinds of neighbors to coexist on the trunk. VTP version 3 sends VTP version 3 and VTP version 2 updates on VTP version 2-detected trunks. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/vtp.html 


400-101  exam guide

Renew hda 3740-b-400-101:

Q384. Which technology can MSDP SA filters use to filter traffic? 

A. route maps 

B. community lists 

C. prefix lists 

D. class maps 

Answer: A 


Q385. DRAG DROP 

Drag and drop the LACP elements on the left into the correct priority order in the hot-standby port-selection process on the right. 


Answer: 



Q386. Refer to the exhibit. 


Which two statements about the output are true? (Choose two.) 

A. 802.1D spanning tree is being used. 

B. Setting the priority of this switch to 0 for VLAN 1 would cause it to become the new root. 

C. The hello, max-age, and forward delay timers are not set to their default values. 

D. Spanning-tree PortFast is enabled on GigabitEthernet1/1. 

Answer: A,B 

Explanation: 

802.1D is the standard for Spanning tree, which is being used here. For priority, The priority order starts from 0 (yes, 0 is valid) and then increases in 4096. 0, 4096, 8192, 12288, …. Etc. 

The lower the number is, the higher is the priority. Here we see that the current root has a priority of 8192, so configuring this with a priority of 0 will make it the new root. 


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Actual 400-101 ccie routing and switching:

Q387. Which two hashing algorithms can be used when configuring SNMPv3? (Choose two.) 

A. MD5 

B. SHA-1 

C. Blowfish 

D. DES 

E. AES 

F. SSL 

Answer: A,B 

Explanation: 

Note that SNMPv3 does not send passwords in clear-text and uses hash-based authentication with either MD5 or SHA1 functions (HMAC authentication – the packet conted is hashed along with authentication key to produce the authentication string). 

Reference: http://blog.ine.com/2008/07/19/snmpv3-tutorial/ 


Q388. Which two options are benefits of EIGRP OTP? (Choose two.) 

A. It allows EIGRP routers to peer across a service provider without the service provider involvement. 

B. It allows the customer EIGRP domain to remain contiguous. 

C. It requires only minimal support from the service provider. 

D. It allows EIGRP neighbors to be discovered dynamically. 

E. It fully supports multicast traffic. 

F. It allows the administrator to use different autonomous system numbers per EIGRP domain. 

Answer: A,B 

Explanation: 

EIGRP Over the Top (OTP) allows EIGRP routers to peer across a service provider infrastructure without the SP’s involvement. In fact with OTP, the provider won’t see customer routes at all. EIGRP OTP acts as a provider-independent overlay that transports customer data between the customer’s routers. To the customer, the EIGRP domain is contiguous. A customer’s EIGRP router sits at the edge of the provider cloud, and peers with another EIGRP router a different location across the cloud. Learned routes feature a next hop of the customer router — not the provider. Good news for service providers is that customers can deploy EIGRP OTP with their involvement 

Reference: http://ethancbanks.com/2013/08/01/an-overview-of-eigrp-over-the-top-otp/ 


Q389. Which component of MPLS architecture uses protocols such as the label distribution protocol and tag distribution protocol to exchange labels? 

A. control plane 

B. data plane 

C. forwarding plane 

D. routing plane 

Answer: A 


Q390. Which two solutions can reduce UDP latency? (Choose two.) 

A. fast retransmission 

B. fast recovery 

C. fast start 

D. low-latency queuing 

E. IP service level agreements 

F. congestion-avoidance algorithm 

Answer: D,E 

Explanation: 

IP SLA uses active traffic monitoring, which generates traffic in a continuous, reliable, and predictable manner to measure network performance. IP SLA sends data across the network to measure performance between multiple network locations or across multiple network paths. It simulates network data and IP services, and collects network performance information in real time. This information is collected: 

Response times 

One-way latency, jitter (interpacket delay variance) 

Packet loss 

Network resource availability 

LLQ uses the priority command. The priority command allows you to set up classes based on a variety of criteria (not just User Datagram Ports (UDP) ports) and assign priority to them, and is available for use on serial interfaces and ATM permanent virtual circuits (PVCs). A similar command, the ip rtp priority command, allows you to stipulate priority flows based only on UDP port numbers. Note: All the other answer choices can be used to improve TCP performance, but not UDP. 

References: http://www.cisco.com/c/en/us/td/docs/routers/xr12000/software/xr12k_r4-2/system_monitoring/configuration/guide/b_sysmon_cg42xr12k/b_sysmon_cg42xr12k_chapter_011.html http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsllq26.html