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2021 Mar 400-101 braindumps

Q321. Refer to the exhibit. 

Which statement is true? 

A. The Cisco PfR state is UP; however, the external interface Et0/1 of border router 10.1.1.1 has exceeded the maximum available bandwidth threshold. 

B. The Cisco PfR state is UP; however, an issue is preventing the border router from establishing a TCP session to the master controller. 

C. The Cisco PfR state is UP and is able to monitor traffic flows; however, MD5 authentication has not been successful between the master controller and the border routers. 

D. The Cisco PfR State is UP; however, the receive capacity was not configured for inbound traffic. 

E. The Cisco PfR state is UP, and the link utilization out-of-policy threshold is set to 90 percent for traffic exiting the external links. 

Answer:

Explanation: 

All three interfaces show as UP, and the capacity is set to 500 kbps, with the max threshold set to 450 kbps (90% of 500kbps). 


Q322. Refer to the exhibit. 

Which type of BGP peer is 192.168.1.1? 

A. route reflector client 

B. iBGP 

C. confederation 

D. VPNv4 

Answer:


Q323. Which two statements about PIM-DM are true? (Choose two.) 

A. It forwards multicast packets on a source tree. 

B. It requires an RP. 

C. It forwards multicast packets on a shared distribution tree. 

D. It floods multicast packets to neighbors that have requested the data. 

E. It floods multicast packets throughout the network. 

F. It forwards multicast packets to neighbors that have requested the data. 

Answer: A,E 


Q324. Which two mechanisms provide Cisco IOS XE Software with control plane and data plane separation? (Choose two.) 

A. Forwarding and Feature Manager 

B. Forwarding Engine Driver 

C. Forwarding Performance Management 

D. Forwarding Information Base 

Answer: A,B 

Explanation: 

Control Plane and Data Plane Separation 

IOS XE introduces an opportunity to enable teams to now build drivers for new Data Plane ASICs outside the IOS instance and have them program to a set of standard APIs which in turn enforces Control Plane and Data Plane processing separation. IOS XE accomplishes Control Plane / Data Plane separation through the introduction of the Forwarding and Feature Manager (FFM) and its standard interface to the Forwarding Engine Driver (FED). FFM provides a set of APIs to Control Plane processes. In turn, the FFM programs the Data Plane via the FED and maintains forwarding state for the system. The FED is the instantiation of the hardware driver for the Data Plane and is provided by the platform. 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-xe-3sg/QA_C67-622903.html 


Q325. Which three statements about the route preference of IS-IS are true? (Choose three.) 

A. An L1 path is preferred over an L2 path. 

B. An L2 path is preferred over an L1 path. 

C. Within each level, a path that supports optional metrics is preferred over a path that supports only the default metric. 

D. Within each level of metric support, the path with the lowest metric is preferred. 

E. The Cisco IS-IS implementation usually performs equal cost path load balancing on up to eight paths. 

F. Both L1 and L2 routes will be installed in the routing table at the same time. 

Answer: A,C,D 

Explanation: 

Given multiple possible routes to a particular destination, an L1 path is preferred over an L2 path. Within each level, a path that supports the optional metrics is preferred over a path that supports only the default metric. (Again, Cisco supports only the default metric, so the second order of preference is not relevant to Cisco routers.) Within each level of metric support, the path with the lowest metric is preferred. If multiple equal-cost, equal-level paths are found by the Decision process, they are all entered into the route table. The Cisco IS-IS implementation usually performs equal-cost load balancing on up to six paths. 

Reference: http://www.realccielab.org/operation-of-integrated-is-is.html 


Most recent 400-101 free exam questions:

Q326. Which two values comprise the VPN ID for an MPLS VPN? (Choose two.) 

A. an OUI 

B. a VPN index 

C. a route distinguisher 

D. a 16-bit AS number 

E. a 32-bit IP address 

Answer: A,B 

Explanation: 

Each MPLS VPN ID defined by RFC 2685 consists of the following elements: 

. An Organizational Unique Identifier (OUI), a three-octet hex number: The IEEE Registration Authority assigns OUIs to any company that manufactures 

components under the ISO/IEC 8802 standard. The OUI is used to generate universal LAN MAC addresses and protocol identifiers for use in local and metropolitan area network applications. For example, an OUI for Cisco Systems is 00-03-6B (hex). 

. A Virtual Private Network (VPN) index: a four-octet hex number, which identifies the VPN within the company. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l3_vpns/configuration/15-mt/mp-l3-vpns-15-mt-book/mp-assgn-id-vpn.html 


Q327. DRAG DROP 

Drag and drop the IPv6 multicast feature or protocol on the left to the correct address space on the right. 

Answer: 


Q328. Where is multicast traffic sent, when it is originated from a spoke site in a DMVPN phase 2 cloud? 

A. spoke-spoke 

B. nowhere, because multicast does not work over DMVPN 

C. spoke-spoke and spoke-hub 

D. spoke-hub 

Answer:

Explanation: 

Spokes map multicasts to the static NBMA IP address of the hub, but hub maps multicast packets to the “dynamic” mappings – that is, the hub replicates multicast packets to all spokes registered via NHRP, so multicast traffic is sent to the hub from a spoke instead of to the other spokes directly. 


Q329. A network engineer wants to add a new switch to an existing switch stack. Which configuration must be added to the new switch before it can be added to the switch stack? 

A. No configuration must be added. 

B. stack ID 

C. IP address 

D. VLAN information 

E. VTP information 

Answer:


Q330. Which two descriptions of the keying mechanisms that are used to distribute the session keys used in routing authentication are true? (Choose two.) 

A. Peer keying creates a unique one-to-one relationship with another peer. 

B. Group keying creates a single keying message to multiple peers. 

C. Peer keying creates a single keying message to multiple peers. 

D. Group keying creates a unique one-to-one relationship with another peer. 

E. Group keying creates a full mesh of keying sessions to all devices. 

F. Peer keying creates a full mesh of keying sessions to all devices. 

Answer: A,B