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CCNA 640-802 Bible – Identify Common Problems Associated with IP Addressing and Host Configurations
Friday, July 17th, 20091. An administrator issues the command ping 127.0.0.1 from the command line prompt on a PC. If a reply is received, what does this confirm?
A: The PC has connectivity with a local host.
B: The PC has connectivity with a Layer 3 device.
C: The PC has a default gateway correctly configured.
D: The PC has connectivity up [...]
CCNA 640-802 Bible – OSI and TCP Basic Operation
Friday, July 3rd, 20091. Why does the data communication industry use the layered OSI reference model? (Choose two.)
A:It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
B:It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.
C:It supports the evolution of multiple competing [...]
CCNA 640-802 Bible – OSI and TCP/IP models
Friday, July 3rd, 20091. At which layers of the OSI model do WANs operate? (Choose two.)
A:application layer
B:session layer
C:transport layer
D:network layer
E:datalink layer
F:physical layer
Correct Answers: E, F
Explanation:
Tags: 640-802 Bible, CCNA, OSI, TCP/IP
R&S Quick Notes – Multicast & IPv6
Tuesday, June 23rd, 2009Multicast
BSR is also commonly referred to as PIMv2.
Pay special attention to when using Frame-Relay non-broadcast types. Multicast will not work. Tunnels might be needed.
BSR – when multiple c-RP announces same groups, a longer match will be used to determine the RP, regardless of the RP priority set.
With TTL scoping, if the Packet [...]
How to configure NAT?
Wednesday, May 13th, 2009There are a number of commands that can be used to configure the different variations of NAT.
Configuring Static NAT
Static NAT configuration requires that each static mapping between a local, or private, address and a global, or public, address must be configured. Then, each interface needs to be identified as either an inside or outside interface.
The [...]
Network Address Translation (NAT)
Wednesday, May 13th, 2009The advantage of using private IP addresses is that it allows an organization to use private addressing in a network, and use the Internet at the same time, by implementing Network Address Translation (NAT). NAT is defined in RFC 1631 and allows a host that does not have a valid registered IP address to communicate [...]
The TCP/IP Model
Saturday, April 11th, 2009TCP/IP and the OSI Reference Model
As illustrated in Figure 1.2, the TCP/IP model consists of four layers, each of which can have several sublayers. These layers correlate roughly to layers in the OSI reference model and define similar functions. Some of the TCP/IP layers correspond directly with layers in the OSI reference model while other [...]
Converting IPv4 to IPv6 and back
Thursday, April 9th, 2009Converting from IPv4 to IPv6
Is so easy, yet everyone seem to convert a IPv4 address to binary, then to IPv6. Why? Why waste time and do things the long way? Not cool.
Firstly before starting I will assume everyone knows the following:
Binary is a Base-2 numbering system, as it has only 0,1
Decimal is a Base-10 numbering [...]