Which two reasons was RFC 1918 address space define(Choose two)

For which two reasons was RFC 1918 address space define(Choose two)
A. to preserve public IPv4 address space
B. to reduce the occurrence of overlapping IP addresses
C. to preserve public IPv6 address space
D. reduce the size of ISP routing tables
E. to support the NAT protocol

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21 thoughts on “Which two reasons was RFC 1918 address space define(Choose two)

  1. Could be A, B or A, E. Question states 1918 define. Well, 1918 is for private ipv4 address space. Can’t route private addresses over the Internet.

  2. Could be A, B or A, D. Question states 1918 define. Well, 1918 is for private ipv4 address space. Can’t route private addresses over the Internet.

  3. This question is so ambiguous .. the Answer could be A and B, A and D or A and E depend the way we explains.

    1. Believe only A and B since the question asked “two reason”, B quesiion is “reduce .. overlapping” is more reasonable , since any private networks could use the same private IP address in their network.

  4. How about 2 assholes across the road and next using there pathitic device to intrap a person andriond every time its turned on to moniture and create, no acually ,make a hole fake network and social media pages and contacts and presented to be every one to control a person contact out side if there house if he trues to yous PC. Ansriod blah boah blah…
    I did not see that option there to chose..
    Maybe add
    (F) ekegal moniting with hand held devices s and PC’s set up a similar ims or singray project for entertainment to piss off a poor prick for years thinking he has been talking to Hus friends and family but it really was hide ass holes … Can we add that please

  5. It is A and E.

    CCNA Routing and Switching Complete Study Guide 100-105,200-105, 200-125 by Todd Lammle, page 177. He is the singular independent authority on Cisco CCNA.

    1. A&B agree that is on my CCNA Switching and Routing Book By Todd Lammle as well I did take boot camp and it will definitely A&B.

  6. It’s actually A & D as per RFC 1918. Read Section 2 entitled Motivation. It specifically mentions address exhaustion and routing overhead of ISPs.

    1. I read it over and yes it explicitly says routing overhead. However, routing overhead is not the same as size of routing tables. A router can have a routing table that has been updated through a routing protocol that contains 250 paths, but if it is only used to access one network outside of itself, and if it does it infrequently, the routing overhead is minimal.

      If you keep reading the section for Motivation, it expands the concept of private vs public addresses and that many internal hosts do not need access to the internet. Therefore, if these internal hosts do not have public IP addresses, and they can only communicate inside their private networks, the routing overhead for ISP routers would decrease dramatically.

      Further on in the section it discusses the differences between ambiguous and unambiguous addresses. Ambiguous being the ones that could potentially overlap and the unambiguous ones not overlapping.

      A + B

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