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CCNA Training
This category will help you understand ccna certification,including exam 640-802,640-816 and 640-822.
Cisco Certified Network Associate (CCNA®) validates the ability to install, configure, operate, and troubleshoot medium-size route and switched networks, including implementation and verification of connections to remote sites in a WAN. CCNA curriculum includes basic mitigation of security threats, introduction to wireless networking concepts and terminology, and performance-based skills. This new curriculum also includes (but is not limited to) the use of these protocols: IP, Enhanced Interior Gateway Routing Protocol (EIGRP), Serial Line Interface Protocol Frame Relay, Routing Information Protocol Version 2 (RIPv2),VLANs, Ethernet, access control lists (ACLs).
Network Address Translation (NAT)
Nov 10th
The 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 with
other hosts through the Internet. Essentially, NAT allows hosts that use private
addresses or addresses assigned to another organization, i.e. addresses that are not
Internet-ready, to continue to be used and still allows communication with hosts
across the Internet. NAT accomplishes this by using a valid registered IP address to
represent the private address to the rest of the Internet. The NAT function changes
the private IP addresses to publicly registered IP addresses inside each IP packet
that is transmitted to a host on the Internet.
Popularity: 1% [?]
Network Address Translation (NAT)
Nov 10th
The 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 with
other hosts through the Internet. Essentially, NAT allows hosts that use private
addresses or addresses assigned to another organization, i.e. addresses that are not
Internet-ready, to continue to be used and still allows communication with hosts
across the Internet. NAT accomplishes this by using a valid registered IP address to
represent the private address to the rest of the Internet. The NAT function changes
the private IP addresses to publicly registered IP addresses inside each IP packet
that is transmitted to a host on the Internet.
Popularity: 1% [?]
Private IP Addressing
Nov 10th
Most organizations have a number of computers that will never be connected to the
Internet. These computers do not need globally unique IP addresses but must be
unique within the organization’s network. Thus, an organization could use any
network number(s) it wanted, regardless of whether those network number(s) are in
use on the Internet or not. However, a set of IP addresses from Class A, Class B and
Class C has been set aside for use in private networks and has been defined in RFC
1918. This RFC defines a set of networks that not be assigned to any organization as
a registered network number to be used on the Internet. These network numbers allow
organizations to use unregistered network numbers that are not used by anyone else
in the public Internet. However, no organization is allowed to advertise these
networks using a routing protocol on the Internet.
Popularity: -0% [?]
Verifying the EIGRP Configuration
Nov 10th
Configuring EIGRP
Nov 10th
Verifying the OSPF Configuration
Nov 10th
Configuring OSPF
Nov 10th
EIGRP Loop Avoidance
Nov 10th
EIGRP avoids loops by keeping some basic topological information but not full
information. When a router learns multiple routes to the same subnet, it puts the
best route in the routing table, following the same rules about adding multiple
equal-metric routes as IGRP. In EIGRP, the best route, i.e., the route with the
lowest metric is called the successor. EIGRP also runs an algorithm to identify
which backup routes could be used in case of a route failure, without causing a
loop. These routes are called feasible successors.
Popularity: 1% [?]
Balanced Hybrid Routing Protocol and EIGRP
Nov 10th
Cisco supports two distance vector IP routing protocols, namely RIP and IGRP; two
link-state IP routing protocols, namely OSPF and Intermediate System-to-Intermediate
System (IS-IS); and a single balanced hybrid IP routing protocol, namely Enhance
IGRP (EIGRP).
EIGRP is called a balanced hybrid protocol because it has some features that act
like distance vector protocols and some features that act like link-state protocols.
EIGRP uses neighbor discover and exchange full routing information. Like OSPF, EIGRP
sends and receives hello packets to ensure that the neighbor is still available but
uses a different Hello packet than OSPF. When link status changes or new subnets are
discovered, reliable routing updates are sent, but only with the new information.
EIGRP uses a formula based on bandwidth and delay to calculate the metric associated
with a route. It uses the same formula used by IGRP, but the number is multiplied by
256 to accommodate calculations when very high bandwidth values are used.
Popularity: 1% [?]
Router Responsibilities
Nov 10th
Because of the hierarchical nature of a multiple area OSPF network, routers have
different responsibilities, depending on their position and functionality within the
hierarchical design. These routers have different designations such as internal
routers, backbone routers, area border routers (ABR), and autonomous system boundary
routers (ASBR).
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Popularity: -0% [?]
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