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2021 Mar 400-101 test

Q381. Which three statements are true about OSPFv3? (Choose three.) 

A. The only method to enable OSPFv3 on an interface is via the interface configuration mode. 

B. Multiple instances of OSPFv3 can be enabled on a single link. 

C. There are two methods to enable OSPFv3 on an interface, either via the interface configuration mode or via the router configuration mode. 

D. For OSPFv3 to function, IPv6 unicast routing must be enabled. 

E. For OSPFv3 to function, IPv6 must be enabled on the interface. 

F. Only one instance of OSPFv3 can be enabled on a single link. 

Answer: B,D,E 

Explanation: 

Here is a list of the differences between OSPFv2 and OSPFv3: 

They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols (more on this following)) 

OSPFv3 introduces new LSA types 

OSPFv3 has different packet format 

OSPFv3 uses different flooding scope bits (U/S2/S1) 

OSPFv3 adjacencies are formed over link-local IPv6 communications 

OSPFv3 runs per-link rather than per-subnet 

OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses 

OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs) 

OSPFv3 Neighbor Authentication done with IPsec (AH) 

OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number 

Following is a simple example of OSPFv3 configuration on a Cisco IOS 12.4T router. 

ipv6 unicast-routing 

ipv6 cef 

interface GigabitEthernet 0/0 

description Area 0.0.0.0 backbone interface 

ipv6 address 2001:DB8:100:1::1/64 

ipv6 ospf network broadcast 

ipv6 ospf 100 area 0.0.0.0 

Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and-ipv6.html 


Q382. What are the three variants of NTPv4? (Choose three.) 

A. client/server 

B. broadcast 

C. symmetric 

D. multicast 

E. asymmetric 

F. unicast 

Answer: A,B,C 


Q383. Which neighbor-discovery message type is used to verify connectivity to a neighbor when the link-layer address of the neighbor is known? 

A. neighbor solicitation 

B. neighbor advertisement 

C. router advertisement 

D. router solicitation 

Answer:

Explanation: 

IPv6 Neighbor Solicitation Message A value of 135 in the Type field of the ICMP packet header identifies a neighbor solicitation message. Neighbor solicitation messages are sent on the local link when a node wants to determine the link-layer address of another node on the same local link (see the figure below). When a node wants to determine the link-layer address of another node, the source address in a neighbor solicitation message is the IPv6 address of the node sending the neighbor solicitation message. The destination address in the neighbor solicitation message is the solicited-node multicast address that corresponds to the IPv6 address of the destination node. The neighbor solicitation message also includes the link-layer address of the source node. 

Figure 1. IPv6 Neighbor Discovery: Neighbor Solicitation Message 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-3s/ip6b-xe-3s-book/ip6-neighb-disc-xe.html 


Q384. Refer to the exhibit. 

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

A. The PPP multilink protocol header is omitted on delay-sensitive packets. 

B. The maximum number of fragments is 1. 

C. Small real-time packets are multilink-encapsulated. 

D. A transmit queue is provided for smaller packets. 

Answer: A,D 

Explanation: 

Previous implementations of Cisco IOS Multilink PPP (MLP) include support for Link Fragmentation Interleaving (LFI). This feature allows the delivery of delay-sensitive packets, such as the packets of a Voice call, to be expedited by omitting the PPP Multilink Protocol header and sending the packets as raw PPP packets in between the fragments of larger data packets. This feature works well on bundles consisting of a single link. However, when the bundle contains multiple links there is no way to keep the interleaved packets in sequence with respect to each other. The Multiclass Multilink PPP (MCMP) feature in Cisco IOS Release 12.2(13)T addresses the limitations of MLP LFI on bundles containing multiple links by introducing multiple data classes. With multiclass multilink PPP interleaving, large packets can be multilink-encapsulated and fragmented into smaller packets to satisfy the delay requirements of real-time voice traffic; small real-time packets, which are not multilink encapsulated, are transmitted between fragments of the large packets. The interleaving feature also provides a special transmit queue for the smaller, delay-sensitive packets, enabling them to be transmitted earlier than other flows. Interleaving provides the delay bounds for delay-sensitive voice packets on a slow link that is used for other best-effort traffic. 

References: http://www.cisco.com/c/en/us/td/docs/ios/dial/configuration/guide/12_4t/dia_12_4t_book/dia _multiclass_link_ppp.pdf http://www.cisco.com/c/en/us/td/docs/routers/access/500/520/software/configuration/guide/520_SCG_Book/520scg_concepts.html 


Q385. Which three options are three benefits of an MPLS VPN? (Choose three.) 

A. It allows IP address space overlap by maintaining customer routes in a private routing table. 

B. It offers additional security by preventing intrusions directly into the customer routing table. 

C. It offers a transparent virtual network in which all customer sites appear on one LAN. 

D. It offers additional security by allowing only dynamic routing protocols between CE and PE routers. 

E. It allows IP address space overlap by maintaining customer routes in the global routing table with unique BGP communities. 

F. Providers can send only a default route for Internet access into the customer VPN. 

Answer: A,B,C 


Regenerate 400-101 vce:

Q386. DRAG DROP 

Drag and drop the protocol on the left to the corresponding administrative distance on the right. 

Answer: 


Q387. DRAG DROP 

Drag and drop the QoS requirement on the left to the correct QoS technology on the right. 

Answer: 


Q388. Refer to the exhibit. 

RIPv2 authentication is failing on a device with this configuration. Which two actions can you take to enable it? (Choose two.) 

A. Set the RIP authentication mode to text. 

B. Set the RIP authentication mode to MD5. 

C. Configure the password encryption for the key. 

D. Set the password encryption to AES. 

Answer: A,B 

Explanation: 

See the reference link below for information on configuring RIPv2 authentication, including both test and MD5 modes. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13719-50.html#configuringplain 


Q389. 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 


Q390. What is the maximum number of classes that MQC can support in a single policy map? 

A. 512 

B. 256 

C. 128 

D. 64 

Answer: