Related Posts: Virtualization
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Nowadays when several MAC addresses are associated with one switch port, we cannot assume that this port is connected to another switch or hub as before. It might be connected to a Virtual Machine server.
Monday, October 19, 2009
MAC address ranges of virtualized world
Friday, October 16, 2009
Wi-Fi Blocking Paint
Related Posts: Wireless LAN
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We know that Wireless LAN (Wi-Fi) is riding on non-licensed bands of radio frequencies. It is unavoidable, especially in a metropolitan area, that our facilities are filled with un-wanted wireless LAN radios.
With new strong encryption, we do not have to worry about the information leakage. However, we DO have to worry about effective transmission throughput. The more users in the same channels, the less effective throughput can we get!
Tuesday, October 6, 2009
How to verify the Secondary Root?
Related Posts: CCNA, Spanning Tree Protocol
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As you know we can configure the designated switch as the "Primary root role" or the "Secondary root role" using the following commands:
Although these commands are just "macros" that we cannot see them in the running configuration, it is still easy to verify the "Primary root role" is correctly configured: We just use "show spanning-tree" command to check the designated switch is really the current "Root Bridge".spanning-tree vlan 10 root primay spanning-tree vlan 20 root secondary
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CCNA Exploration 4.0, Semester 2, Companion Practices by Li-Ji, for Cisco Network Academy students
- Manual routes only configuration practice (CNA-02-001)
- Automatic routing table maintenance by routing protocol configuration, using RIPv1 (CNA-02-002)
- Automatic routing table maintenance by routing protocol configuration, still using RIPv1 (CNA-02-003)
- Observe advertisement of Default Route by automatic routing protocol, still using RIPv1 (CNA-02-004)
- Solving Classful addressing problem, using RIP (CNA-02-005)
- Observe and solve Classful addressing problem, using EIGRP (CNA-02-006)
- Observe and solve Classful addressing problem, using OSPF (CNA-02-007)
CCNA Exploration 4.0, Semester 3, Companion Practices by Li-Ji, for Cisco Network Academy students
- Enable Virtual LAN (VLAN) to seperate two Layer 2 worlds (CNA-03-001)
- Providing two Virtual LAN (VLAN), using 2 connected switches (CNA-03-002)
- Providing two Virtual LAN (VLAN), using 3 connected switches (CNA-03-003)
- Enable VTP to distribute VLAN information, and provide two Virtual LAN (VLAN), using 3 connected switches (CNA-03-004)
- Observe and configure designated switch as Spanning Tree Protocol's root role (CNA-03-005)
- Provide across 3 VLANs, Layer 3 connectivity using a router with 3 LAN interfaces (CNA-03-006)
- Provide across 3 VLANs, Layer 3 connectivity using a router with single LAN interface (CNA-03-007)
CCNA Exploration 4.0, Semester 4, Companion Practices by Li-Ji, for Cisco Network Academy students
- Configuring PPP on serial interfaces and CHAP Authentication (CNA-04-001)
- Frame Relay and RIP problem configuration and observation (CNA-04-002)
- Using TFTP to recorver Cisco IOS Image file, and to backup/restore configurations (CNA-04-003)
- Using Access Control List (ACL) to restrict inbound Internet access (CNA-04-004)
- Configure NAT/PAT to enable outbound Internet connectivity (CNA-04-005)
- Dual Stack IPv6 and IPv4 configuration (CNA-04-006)
