Posts

CCNA Extra Class 07: Concept of EtherChannel & Configuration

-
Image
EtherChannel is a Cisco technology that allows you to bundle multiple physical Ethernet interfaces into one logical interface and the bundle of ethernet interfaces is called Port-Channel. This gives: Higher Bandwidth → adds up the bandwidth of all bundled links. Redundancy & Fault Tolerance → if one link fails, traffic keeps flowing on the others. Load Balancing → distributes traffic across links. Simpler Management → several ports act as one logical interface. ** Channel Groups and Port-Channel Interfaces A channel group is the configuration command that bundles multiple physical interfaces into one logical EtherChannel and When you assign interfaces to the same channel group, they are automatically associated with a new logical interface called a Port-Channel.  ** EtherChannel Characteristics - Maximum 8 links can be bundled in one EtherChannel. All links in the channel must have: Same speed (e.g., all 1 Gbps). Same duplex mode. Same VLAN information (if on access mod...
Read more

CCNA Extra Class-06: Concept of STP in Cisco

-
Image
  STP Objective
Read more

CCNA Extra Class 05: DHCP and CDP Configuration in Cisco

-
Image
 How to Configure the DHCP Server in Cisco Step-01: DHCP Server Configuration in Cisco Router CoreRouter(config)#interface gigabitEthernet 0/0 CoreRouter(config-if)#ip address 172.31.0.1 255.255.255.0  CoreRouter(config-if)#no shutdown  CoreRouter(config)#ip dhcp pool LAN_POOL  CoreRouter(dhcp-config)#domain-name xyz.com  CoreRouter(dhcp-config)#network 172.31.0.0 255.255.255.0 CoreRouter(dhcp-config)#default-router 172.31.0.1  CoreRouter(dhcp-config)#dns-server 172.31.0.1  CoreRouter(config)#ip dhcp excluded-address 172.31.0.1 172.31.0.10 CoreRouter(config)#ip dhcp excluded-address 172.31.0.254 Step-02: DHCP Client Configuration in Cisco Router ClientRouter(config)#interface fastEthernet 0/0 ClientRouter(config)#no shutdown ClientRouter(config)#ip address dhcp ClientRouter#show ip interface brief Step-03: Check the Configuration CoreRouter#show ip dhcp pool CoreRouter#show ip dhcp binding N:B: Every nodes getting the IP addresses from DHCP server....
Read more

CCNA Extra Class 04: Configure the IPSec VPN Site to Site Tunnel in Cisco

-
Image
  How to Configure IPSec VPN Site to Site Tunneling in Cisco Routers Addressing Table Device Interface IP address Gateway Comment R1 Gig0/0 192.168.10.1/24     Se0/0/0 10.10.10.1/30     R2 Se0/0/0 10.10.10.2/30     Se0/0/1 10.20.20.2/30     Gig0/0 192.168.20.1/24     R3 Gig0/0 192.168.30.1/24     Se0/0/0 10.20.20.1/30     PC-A Fa0 192.168.10.10/24 192.168.10.1   PC-B Fa0 192.168.20.10/24 192.168.20.1   PC-C Fa0 192.168.30.10/24 ...
Read more

CCNA Extra Class 03: Basic VPN Tunneling Configuration in Cisco

-
Image
 How to Configure the Basic VPN Tunneling Between Cisco Routers Step-01: Routing Protocol Configuration R1(config)#route rip R1(config-router)#network 10.0.0.0  R1(config-router)#network 1.0.0.0 R2(config)#router rip  R2(config-router)#network 20.0.0.0 R2(config-router)#network 2.0.0.0 Core_R(config)#router rip  Core_R(config-router)#network 1.0.0.0 Core_R(config-router)#network 2.0.0.0 Step-02: Create VPN Tunneling both Routers R1(config)#interface tunnel 100 R1(config-if)#ip address 172.31.0.1 255.255.255.0 R1(config-if)#no shutdown  R1(config-if)#tunnel source serial 0/0/0 R1(config-if)#tunnel destination 2.0.0.2 R2(config)#interface tunnel 200 R2(config-if)#no shutdown  R2(config-if)#ip address 172.31.0.2 255.255.255.0 R2(config-if)#tunnel source serial 0/0/0 R2(config-if)#tunnel destination 1.0.0.2 Step-03: Routing For passing Data through VPN Tunnel R1(config)#ip route 20.0.0.0 255.255.255.0 172.31.0.2 R2(config)#ip route 10.0.0.0 255.255.255.0 172.31...
Read more

CCNA Extra Lesson 02: Concept of Switch Port Security in Cisco

-
Image
Port Security in Cisco Switch Port Security in a Cisco switch is a feature that helps protect the network by restricting input to an interface and limiting and identifying the MAC addresses of the stations allowed to access the port. It’s widely used in enterprise and ISP networks to prevent unauthorized devices from connecting to the network. Ethernet Port Security Use - Preventing unauthorized access — stops users from plugging in personal laptops or switches. Limit MAC flooding attacks — protects the MAC address table from being overfilled. Enforce endpoint control — only pre-approved devices can connect.    When port security is enabled: The switch port learns or is configured with allowed MAC addresses Any device with an unrecognized MAC address trying to send traffic is blocked or triggers an action. You can set how many devices are allowed per port (default: 1).      Port Security Terms Static Secure MAC Address -- Manually configured MAC address ...
Read more

CCNA Extra Lesson 01: VTP (VLAN Trunking Protocol) Concept and Configuration

-
Image
Overview of the VTP in Networking "" Can you imagine that you have hundreds of Cisco Switches among your networks and you have huge amount of VLANs, that you have to provisioning to among of those switches.? What will you have to do when the you have to configure all of the VLANs manually.? "" So, to reduce the burden of provisioning VLANs on switches, CISCO came up with this solution: VTP – VLAN Trunking Protocol. VLAN Trunking Protocol (VTP) is a Cisco proprietary Layer 2 protocol that helps manage VLAN configuration consistently across a network of Cisco switches. Instead of manually creating, deleting, or renaming VLANs on every switch, VTP allows you to configure VLAN information on one switch (the VTP server) and automatically propagate those changes to all other switches in the same VTP domain. It’s like having one “control center” for VLAN management in your network. How VTP Works VTP messages are sent over trunk links (such as IEEE 802.1Q or ISL) to share...
Read more