Ccna certification Practice Tests

391

 10.  A.  Bandwidth is the primary decision factor for moving the Domain Name System (DNS) 

closer to the application in the public cloud. However, if the majority of DNS users are on 

premises, then it should remain on premises for bandwidth reasons. Response time should 

not increase, since DNS is a lightweight service for looking up resource records. DNS 

resolution should not be affected when migrating DNS to a public cloud. Although the 

cloud provider has certain requirements, DNS functionality is relatively the same.

 11.  C.  Flow control is synonymous with the Transport layer of the Open Systems 

Interconnection (OSI) model. User Datagram Protocol (UDP) operates at the Transport 

layer, but UDP does not provide flow control for communications. UDP provides a 

program with a connectionless method of transmitting segments. The Internet Protocol 

(IP) is logical addressing for the routing of information. Transmission Control Protocol 

(TCP) is a connection-based protocol and maintains a state throughout the transfer of 

data. The Internet Control Message Protocol (ICMP) is used as an error reporting tool for 

IP packets as well as a diagnostic protocol for determining path problems.

 12.  C.  The network seems to be configured properly. You have received a valid address in 

the Class A space of the RFC 1918 private address range. The network jack is obviously 

working because you have been assigned an IP address. The network is configured 

properly, and no evidence exists to determine it is not configured properly. The DHCP 

server is obviously working because it assigned you an IP address where there was no prior 

IP address.

 13.  C.  The network 192.168.4.32/27 has a valid IP address range of 192.168.4.33 to 

192.168.4.62. The /27 CIDR notation, or 255.255.255.224 dotted-decimal notation 

(DDN), defines networks in multiples of 32. Therefore, the address 192.168.4.28/27 is 

part of the 192.168.4.32/27 network. All of the other options are incorrect.

 14.  D.  Stateless DHCPv6 servers are used to configure DHCP options only. The one option 

that all clients need is the DNS server. The default gateway and the IPv6 address are 

configured via the Router Solicitation (RS) and Router Advertisement (RA) packets, when 

a client starts up in the network. The IPv6 prefix length is fixed to a 64-bit prefix.

 15.  B.  Duplicate Address Detection, or DAD, uses Neighbor Solicitation and Neighbor 

Advertisement messages to avoid duplicate addresses when SLAAC is being used. 

Neighbor Discovery Protocol (NDP) is a protocol that is used to discover neighboring 

devices in an IPv6 network for layer 2 addressing. Stateless Address Autoconfiguration 

(SLAAC) is an IPv6 method used to assign the 64-bit network ID to a host. ARPv6 is not 

a valid protocol; the Address Resolution Protocol (ARP) in IPv4 has been replaced with 

NDP in IPv6.

 16.  B.  The IPv6 address 2202:0ff8:0002:2344:3533:8eff:fe22:ae4c is an EUI-64 generated 

address. The host portion of the address is 3533:8eff:fe22:ae4c, the fffe in the middle of it 

depicts that the address was generated from the MAC address. The MAC address of this 

host would be 37-33-8e-02-ae-4c. When EUI-64 is used, an ffee is placed in the middle of 

the MAC address, and then the 7th bit from the left is flipped. This changes the first two 

hex digits of the MAC address from 35 to 37. Multicast addresses will always start with 

ff00. Anycast addresses are not visibly different because they are normal addresses with 

special regional routing statements that direct communications to the closest server. Link-

local addresses will always start with fe80.

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