CCDA 640-864 Q&As – IPv4 and IPv6 (6-10)

March 22, 2012

Section 7 – IPv4 and IPv6

QUESTION 6
A network design includes private addressing, but there is also a need for two or three network devices to each be assigned a unique public address so they can be accessed from the Internet.
Which technique will satisfy this requirement?
A.    Static NAT
B.    VPN tunneling
C.    Dynamic NAT
D.    DHCP
Answer: A

Explanation:
NAT has several forms:
Static NAT: Maps an unregistered or private IP address to a registered IP address; it is configured manually. It is commonly used to assign a network device with internal private IP address a unique public address so that they can be accessed from the Internet.
Dynamic NAT: Dynamically maps an unregistered or private IP address to a registered IP address from a pool (group) of registered addresses. The two subsets of dynamic NAT are overloading and overlapping:
oOverloading: Maps multiple unregistered or private IP addresses to a single registered IP address by using different ports. This is also known as PAT, single-address NAT, or port-level multiplexed NAT.
oOverlapping: Maps registered internal IP addresses to outside registered IP addresses It can also map external addresses to internal registered addresses.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 8

QUESTION 7
You design a network with the following network addresses:
192.168.168.0
192.168.169.0
192.168.170.0
192.168.171.0
192.168.172.0
192.168.173.0
192.168.174.0
192.168.175.0
Which route address is the best summary of these network addresses?
A.    192.168.0.0/16
B.    192.168.168.0/21
C.    192.168.0.0/24
D.    192.168.171.128/3
E.    192.168.175.0/3
F.    None of the above
Answer: B
Explanation:
Route Summarization is called route aggregation. Route aggregation creates one route in the routing table represents many other routes. Summarizing routes reduces the routing update traffic and reduces the number of routes in the routing table and overall router overhead in the router receiving the routes
Example of creating Summary Route:
192.168.168.0 = 11000000 10101000 10101 000 00000000 192.168.169.0 = 11000000 10101000 10101 001 00000000 192.168.170.0 = 11000000 10101000 10101 010 00000000 192.168.171.0 = 11000000 10101000 10101 011 00000000
192.168.172.0 =11000000 10101000 10101 100 00000000
192.168.173.0 = 11000000 10101000 10101 101 00000000 192.168.174.0 =11000000 10101000 10101 110 00000000
192.168.175.0 =11000000 10101000 10101 111 00000000
Number of Common Bits = 21
Number of Non-Common Network Bits = 3
Number of Host Bits = 8
So Answer 192.168.168.0/21 is correct.

QUESTION 8
A company is designing a worldwide IPv6 network with duplicated file servers at multiple locations. Each file server contains identical reference information. Which IPv6 address type would be used to allow each end station to send a request to the nearest file server using the same destination address, regardless of the location of that end station?
A.    broadcast
B.    multicast
C.    anycast
D.    unicast
Answer: C
Explanation:
IPv6 Anycast Addresses
The IPv6 anycast (one-to-nearest) address identifies a set of devices. An anycast address is allocated from a set of unicast addresses. These destination devices should share common characteristics and are explicitly configured for anycast.
You can use the anycast address to identify a set of routers or servers within an area. When a packet is sent to the anycast address, it is delivered to the nearest device as determined by the routing protocol. An example of the use of anycast addresses is to assign an anycast address to a set of servers–one in North America, and the other in Europe. Users in North America would be routed to the North American server, and those in Europe to the European server.
You cannot use an anycast address as a source address. Also, you must explicitly configure nodes to which the anycast address is assign to recognize the anycast address.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 9

QUESTION 9
You are designing IPv6 into an existing IPv4 network. Which two strategies can you use to allow
both address schemes to coexist, thus facilitating migration? (Choose two)
A.    translate one protocol into the other
B.    redistribute between IPv6-capable and non-IPv6-capable routing protocols
C.    encapsulate IPv6 packets within IPv4 packets
D.    bridge between the IPv6 and IPv4 networks
E.    enable anycast capability in the routing protocol
Answer: AC

QUESTION 10
Which address type is 225.10.1.1?
A.    Unicast
B.    Anycast
C.    Multicast
D.    Broadcast
Answer: C
Explanation:
Answer A is incorrect as Unicast is an IPv6 address
Answer B is incorrect as Anycast is an IPv6 one to nearest address that identifies a set of devices Answer C is correct as multicast addresses range from 224.0.0.1 to 239.255.255.255. Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 8

 
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