400-201 | Refined 400-201 Exam Questions and Answers 2021

NEW QUESTION 1
In a network function virtualization reference architecture, which two statement about virtualized network function are true?(Choose two)

• A. VNF is the totality of all hardware and software components that build up the NFV environment
• B. One VNF can be deployed over multiple VMs, where each VM hosts a single component of the VNF
• C. VNF performs the orchestration and lifecycle management of the software resources that supports the virtualized infrastructure
• D. VNF is a virtualization of a legacy network function
• E. VNF functionality includes control and management of the compute, storage, and network resources in the NFV framework

Answer: BD

NEW QUESTION 2
What is the relationship between the Domain Name System (DNS) and LDAP?

• A. All the root DNS servers maintain information in a distributed LDAP tree.
• B. DNS clients access DNS information by making LDAP queries to DNS servers.
• C. An LDAP DN attribute is a Domain Name.
• D. It is currently recommended to express DN as a sequence of Domain components

Answer: D

NEW QUESTION 3
DRAG DROP
Drag and drop the BGP AS configuration or route-reflector characteristic from the left onto the correct scalability topic on the right

Answer:

Explanation:

NEW QUESTION 4
In which two ways does the BGP graceful restart capability preserve prefix information during a restart? (Choose two.)

• A. The peer router sends an end -of RIB message to the restarting router
• B. The peer router immediately removes the BGP routes that it learned from the restarting router from its BGP routing table
• C. The restarting router waits to receive updates from the neighboring routers.
• D. The restarting router does not remove any stale prefixes after the timer for stale entries exTs.
• E. The restarting router removes any stale prefixes after the timer for stale entries expires

Answer: CE

NEW QUESTION 5
What are three common reasons for ATM CRC errors? (Choose three.)

• A. Incorrect VPI and VCI configuration
• B. Noise, gain hits, or other transmission problems on the data link equipment
• C. ATM cells are dropped due to incorrect ATM routing in the service provider.
• D. A faulty or failing ATM interface.
• E. Cells are dropped due to traffic policing in the ATM cloud on one or more virtual circuits attached to the ATM interface.

Answer: BDE

Explanation: Reasons for ATM CRC Errors
The following are some potential reasons for ATM CRC errors:
Dropped cells due to traffic policing in the ATM cloud on one or more VCs attached to the ATM interface.
Noise, gain hits, or other transmission problems on the data-link equipment. A faulty or failing ATM interface.
The show interfaces command output displays the CRC error count. These errors suggest that when the SAR reassembles the packet and checks the CRC, the calculated CRC value does not match the value in the assembled packet's CRC field.

NEW QUESTION 6
A service provider has a requirement to prevent and prevent spoofing attacks by verifying the reachability of the sources address in a packet that is forwarded into its network. Which method must be the service provider use?

• A. CoPP
• B. iACL
• C. uRPF
• D. RTBH

Answer: C

NEW QUESTION 7
Which two MVPN profile use either PIM or BGP-AD to advertise the Data-MDT? (Choose two)

• A. Profile 0 : Rosen GRE
• B. Profile 5 : MS-PMSI (Partition) MLDP P2MP with BGP-AD
• C. Profile 3 : Rosen GRE with BGP-AD
• D. Profile 4 : MS-PMSI (Partition) MLDP P2MP with BGP-AD
• E. Profile 9 : Rosen MLDP with BGP-AD
• F. Profile 1 : Rosen MLDP

Answer: CE

NEW QUESTION 8
Which are the two purposes of the MPLS label value 1? (Choose two.)

• A. It indicates an implicit null label
• B. It is used to carry the QoS value in the label stack
• C. It is used for VPNv6 packets
• D. It is used for MPLS OAM packets
• E. It indicates an explicit null label
• F. It indicates a router alert label

Answer: DF

NEW QUESTION 9
What is the purpose of Dual Ring Interconnect with D C for SDH rings?

• A. Protects signals when a ring switch fails
• B. Protects signals when multiple span switches fail
• C. Protects pre-emptible traffic from being dropped when a ring switch occurs
• D. Protects signals against any combination of link failure in each ring

Answer: D

NEW QUESTION 10

Refer to the exhibit. A network engineer from ISP 2 is designing the BGP architecture with a requirement of preventing their customer AS 65001 from becoming a transit AS, using the following configuration.
Router BGP 65000
Neighbor 10.0.0.1 remote-as 65001
Neighbor 10.0.0.1 route-map BGP-ROUTE-policy in
Which Cisco IOS command should be used within the route-map to achieve the goal on ISP 2 from AS 65000?
A.
route-map BGP-ROUTE-POLICY permit 10 set community no-advertise additive
B.
ip as-path access-lists 1 permit^65001$
!
route-map BGP-ROUTE-POLICY deny 10 match as-path 1
!
route-map BGP-ROUTE-POLICY permit 10
C.
ip as-path access-list 1 permit^65001$
!
route-map BGP-ROUTE-POLICY permit 10 match as-path 1
D.
route-map BGP-ROUTE-POLICY permit 10
set community no-export additive

Answer:

NEW QUESTION 11
What type of IPv6 address is the address FF05::2:260:8F908?

• A. Multicast temporary site local
• B. Multicast permanent node link local
• C. Multicast permanent site local
• D. Multicast permanent link local

Answer: C

NEW QUESTION 12
Which of the following comparison of Control Plane Policing (CoPP) with Receive ACL (Racl) is correct?

• A. CoPP protects against IP spoofing; Racl protects against DoS attacks.
• B. CoPP can not use named access lists; Racl can use named access lists
• C. CoPP applies to a dedicated control plane interface; Racl applies to all interfaces.
• D. CoPP needs a AAA server, Racl does not need a AAA server
• E. CoPP supports rate limits; Racl does not support rate limits

Answer: CE

NEW QUESTION 13
Which statement about the Link Control Protocol is true?

• A. LCP is used for basic PPP link setup and operation.
• B. LCP is used for PPP CHAP authentication.
• C. LCP is used for PPP over ATM setup.
• D. LCP is used for PPP over Ethernet setup.
• E. LCP is used for PPP over Frame Relay setup.

Answer: A

NEW QUESTION 14
Which three attribute-value pairs (AVPs) must be present in L2TPv3 ICRQ messages? (Choose three.)

• A. PW capabilities list
• B. Message type
• C. Assigned control connection ID
• D. PW type
• E. Remote session ID
• F. Hostname

Answer: BDE

Explanation: The ICRQ can include information such as pseudowire type, required Layer 2specific sublayer, and circuit status.
The following AVPs MUST be present in the ICRQ: Message Type
Local Session ID Remote Session ID Serial Number Pseudowire Type Remote End ID Circuit Status Services

NEW QUESTION 15
DSCP value "101110" looks like which IP Precedence value to non-DiffServ compliant devices?

• A. IP Precedence 6
• B. IP Precedence 4
• C. IP Precedence 3
• D. IP Precedence 5
• E. IP Precedence 2
• F. IP Precedence 7

Answer: D

NEW QUESTION 16
Which statement about LISP proxy ETR is true?

• A. A LISP site with IPv4-only RLOC connectivity can send IPv6 EIDs within an IPv4 LISP header across the IPv4 internet
• B. A LISP PETR implements ITR mapping database lookup and LISP encapsulation functions on behalf of LISP-capable sites only
• C. A LISP site with IPv6-only RLOC can communicate to non-LISP IPv6 interface users across IPv4 Internet, however , IPv4-only RLOC cannot communicate to non-LISP IPv4 Internet users across IPv6 Internet
• D. PETR supports transport of LISP-only traffic from one address to LISP sites in the same address family

Answer: A