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Category: CCNA 200-125

CCNA 3.2.b: Network mask

Overview: A prefix is simply the network address. A prefix-length is simply a shorthand way to express a network mask using CIDR notation.   Study Notes: A network mask may also be called a subnet mask or netmask for short Let’s read a few of the entries in the routing table and determine their network […]


CCNA 3.2.a: Prefix

Overview: A prefix is simply the network address. In a routing table, the prefix is the destination network address.  A prefix-length is just the shorthand way to express a subnet mask using CIDR notation.  If the subnet mask is 255.255.255.0 than the prefix-length is /24.   Study Notes:   Reading the routing table from top […]


CCNA 3.2: Interpret the components of a routing table

Overview: A routing table consists of entries to networks that are either directly connected, statically configured or dynamically learned. To view a routing table use the “show ip route” command.  You will be presented with something like the following: The CCNA exam covers the following routing table components topics.  Each topic will explore a different […]


CCNA 3.1.c: Frame Rewrite

Overview: Frame rewrite is a crucial step in routing a packet through a router.  Frame rewrite is determining how to construct the Layer 2 frame header to allow the packet to be properly encapsulated toward its next hop and forward the packet out the correct interface.   Study Notes: Here is the process: Packet arrives […]


CCNA 3.1: Describe the routing concepts

Overview: Routing concepts describe the way a packet transits a network from source host to destination host.  Layer 2 and Layer 3 protocols are required to receive the packet, deencapsulate it, determine the destination, determine the exit interface, encapsulate it and transmit it. The following are the routing concepts covered in the CCNA: Study Notes: […]


CCNA 2.10: Describe the benefits of switch stacking and chassis aggregation

Overview: A switch stack is a set of up to nine Cisco EtherSwitch service modules or Catalyst 3750 switches connected through their Cisco StackWise ports. One of the Cisco EtherSwitch service modules or Catalyst 3750 switches controls the operation of the stack and is called the stack master.  It is typically used in the access […]


CCNA 2.9.c: Link Aggregation Protocol (LACP)

Overview: Link Aggregation Control Protocol (LACP) is another option when configuring EtherChannels   Study Notes: LACP is an open protocol adhering to the 802.3ad standard It uses the multicast address of 01-80-c2-00-00-02 Channel mode must be set to “active” or “passive” to specify an LACP port-channel Active – Enable LACP unconditionally Passive – Enable LACP […]


CCNA 2.9.b: Port Aggregation Protocol (PaGP)

Overview: Port Aggregation Protocol (PAgP) is another option when configuring EtherChannels Study Notes: PAgP is a Cisco proprietary protocol It uses the multicast address of 01-00-0C-CC-CC-CC Channel mode must be set to “auto” or “desirable” to specify a PAgP port-channel Auto – Enable PAgP only if a PAgP device is detected Desirable – Enable PAgP […]


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