CCNA Cisco Certified Network Associate CCNA (v3.0)
Question No: 231 – (Topic 5)
Which IPv6 address is the equivalent of the IPv4 interface loopback address 127.0.0.1?
Answer: A Explanation:
In IPv6 the loopback address is written as, ::1
This is a 128bit number, with the first 127 bits being #39;0#39; and the 128th bit being #39;1#39;. It#39;s just a single address, so could also be written as ::1/128.
Question No: 232 – (Topic 5)
Which two of these statements are true of IPv6 address representation? (Choose two.)
There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.
A single interface may be assigned multiple IPv6 addresses of any type.
Every IPv6 interface contains at least one loopback address.
The first 64 bits represent the dynamically created interface ID.
Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.
Answer: B,C Explanation:
->A single interface may be assigned multiple addresses of any type (unicast, anycast, multicast).
->Every IPv6-enabled interface must contain at least one loopback and one link-local
->Optionally, every interface can have multiple unique local and global addresses.
Reference: IPv6 Addressing at a Glance – Cisco PDF
Question No: 233 – (Topic 5)
What is the alternative notation for the IPv6 address B514:82C3:0000:0000:0029:EC7A:0000:EC72?
A. B514 : 82C3 : 0029 : EC7A : EC72
B. B514 : 82C3 :: 0029 : EC7A : EC72
C. B514 : 82C3 : 0029 :: EC7A : 0000 : EC72
D. B514 : 82C3 :: 0029 : EC7A : 0 : EC72
Answer: D Explanation:
There are two ways that an IPv6 address can be additionally compressed: compressing leading zeros and substituting a group of consecutive zeros with a single double colon (::). Both of these can be used in any number of combinations to notate the same address. It is important to note that the double colon (::) can only be used once within a single IPv6 address notation. So, the extra 0’s can only be compressed once.
Question No: 234 – (Topic 5)
Syslog was configured with a level 3 trap. Which 3 types of logs would be generated (choose four)
Answer: A,B,C,D Explanation:
The Message Logging is divided into 8 levels as listed below: Level Keyword Description
0 emergencies System is unusable 1 alerts Immediate action is needed 2 critical Critical conditions exist
errors Error conditions exist
warnings Warning conditions exist
notification Normal, but significant, conditions exist 6 informational Informational messages
7 debugging Debugging messages
The highest level is level 0 (emergencies). The lowest level is level 7. If you specify a level with the “logging console level” command, that level and all the higher levels will be displayed. For example, by using the “logging console warnings” command, all the logging of emergencies, alerts, critical, errors, warnings will be displayed.
Question No: 235 – (Topic 5)
What are three features of the IPv6 protocol? (Choose three.)
Answer: B,C,E Explanation:
An important feature of IPv6 is that it allows plug and play option to the network devices by allowing them to configure themselves independently. It is possible to plug a node into an IPv6 network without requiring any human intervention. This feature was critical to allow network connectivity to an increasing number of mobile devices. This is accomplished by autoconfiguration.
IPv6 does not implement traditional IP broadcast, i.e. the transmission of a packet to all hosts on the attached link using a special broadcast address, and therefore does not define broadcast addresses. In IPv6, the same result can be achieved by sending a packet to the link-local all nodes multicast group at address ff02::1, which is analogous to IPv4 multicast to address 18.104.22.168.
Question No: 236 – (Topic 5)
What are three approaches that are used when migrating from an IPv4 addressing scheme to an IPv6 scheme. (Choose three.)
enable dual-stack routing
configure IPv6 directly
configure IPv4 tunnels between IPv6 islands
use proxying and translation to translate IPv6 packets into IPv4 packets
statically map IPv4 addresses to IPv6 addresses
use DHCPv6 to map IPv4 addresses to IPv6 addresses
Answer: A,C,D Explanation:
Several methods are used terms of migration including tunneling, translators, and dual stack. Tunnels are used to carry one protocol inside another, while translators simply translate IPv6 packets into IPv4 packets. Dual stack uses a combination of both native IPv4 and IPv6. With dual stack, devices are able to run IPv4 and IPv6 together and if IPv6 communication is possible that is the preferred protocol. Hosts can simultaneously reach IPv4 and IPv6 content.
Question No: 237 – (Topic 5)
Which IPv6 address is valid?
B. 2001:0db8:0:130H::87C:140B C. 2031::130F::9C0:876A:130B D. 2031:0:130F::9C0:876A:130B
Answer: D Explanation:
An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits (two octets). The groups are separated by colons (:). An example of an IPv6 address is 2001:0db8:85a3:0000:0000:8a2e:0370:7334. The leading 0’s in a group can be collapsed using ::, but this can only be done once in an IP address.
Question No: 238 – (Topic 5)
How does a DHCP server dynamically assign IP addresses to hosts?
Addresses are permanently assigned so that the host uses the same address at all times.
Addresses are assigned for a fixed period of time. At the end of the period, a new request for an address must be made, and another address is then assigned.
Addresses are leased to hosts. A host will usually keep the same address by periodically contacting the DHCP server to renew the lease.
Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
Answer: C Explanation:
DHCP works in a client/server mode and operates like any other client/server relationship. When a PC connects to a DHCP server, the server assigns or leases an IP address to that PC. The PC connects to the network with that leased IP address until the lease expires.
The host must contact the DHCP server periodically to extend the lease. This lease mechanism ensures that hosts that move or power off do not hold onto addresses that they do not need. The DHCP server returns these addresses to the address pool and reallocates them as necessary.
Question No: 239 – (Topic 5)
Which three features are added in SNMPv3 over SNMPv2?
Cisco IOS software supports the following versions of SNMP:
SNMPv1 – The Simple Network Management Protocol: A Full Internet Standard, defined in RFC 1157. (RFC 1157 replaces the earlier versions that were published as RFC 1067 and RFC 1098.) Security is based on community strings.
SNMPv2c – The community-string based Administrative Framework for SNMPv2. SNMPv2c (the “c” stands for “community”) is an Experimental Internet Protocol defined in RFC 1901, RFC 1905, and RFC 1906. SNMPv2c is an update of the protocol operations and data types of SNMPv2p (SNMPv2 Classic), and uses the community-based security model of SNMPv1.
SNMPv3 – Version 3 of SNMP. SNMPv3 is an interoperable standards-based protocol defined in RFCs 2273 to 2275. SNMPv3 provides secure access to devices by a combination of authenticating and encrypting packets over the network. The security features provided in SNMPv3 are as follows:
Message integrity: Ensuring that a packet has not been tampered with in transit.
Authentication: Determining that the message is from a valid source.
Encryption: Scrambling the contents of a packet prevent it from being learned by an unauthorized source.
Question No: 240 – (Topic 5)
How many bits are contained in each field of an IPv6 address?
Answer: D Explanation:
An IPv6 address is represented as eight groups of four hexadecimal digits, each group
representing 16 bits (two octets). The groups are separated by colons (:). An example of an IPv6 address is 2001:0db8:85a3:0000:0000:8a2e:0370:7334.
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