Bitmindframes cisco study guides
DTP Dynamic Trunking Protocol
Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Cisco proprietary Point-to-Point Protocol.
These various modes are configured using the switchport mode interface command
Switch trunk interfaces support different trunking modes.
- Access
- Dynamic desirable (default mode on Catalyst 2950 and 3550)
- Dynamic auto
- Trunk
- Non-negotiate
- dotq-tunnel (Not an option on the Catalyst 2950.)
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Tags: 802.1q, interface, ip, study, guides, vtp
Configuring a Web Interface:
Switches have web-based config tools that require an onboard HTTP server:
Web browser GUI.
Security Device Manager (SDM).
IP Phone and Telephony apps.
HTTP services ? security hole ? optional authentication.
If many users access HTTP services you may require a separate authentication server.
AAA and TACACS can be used to validate user credentials, (robust).
A less complex method allows use of the enable password.
A local authentication method requires the user to use a login username and password specified in the config.
S1(config)#ip http server ? turns on the server (on by default).
S1(config)#ip http authentication enable.
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Tags: wan, switch, cisco, router, vtp, study
LAN Design:
The Hierarchical Network Model:
CCNA focuses on networks for SMBs (small, medium businesses).
A hierarchical design model is recommended.
Easier to manage and expand.
Problems are solved more quickly.
Hierarchical design divides the network into 3 layers.
Core, (CL).
Distribrution, (DL).
Access, (AL).
Each layer provides specific functions.
This “modularity” facilitates scalability and performance.
Access Layer, (AL): lowest
Interfaces with the end device (user).
Includes routers, switches, bridges, hubs and wireless APs.
Provides a means of connecting devices to the network and controlling which one communicate on the network.
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Tags: vlan, wan, ip, guides, vtp, switch
Wide Area Networks and FRAME RELAY
Frame Realy is the #1 WAN technology worldwide.
Used by all sizes of customers because the Total Cost of Ownership is flexible.
Frame Relay reduces costs by using less equipment, less complexity, & easier implementation than leased lines. It also provides greater reliability, & resilience.
COST EFFECTIVENESS
Frame Relay solutions provide cost effectiveness & flexibility.
With dedicated lines, customers pay for an end to end connection including the local loop & network link.
1.With frame relay you pay for the local loop & for bandwidth.
The Distance between nodes isn’t important.
Lease lines - increments of 64kbs Frame Relay VC(Virtual Connection) are defined with greater granularity, increments as small as 4kbs can be used.
2.Frame Relay is also cost effective in that it shares bandwidth across a larger base of customers.
Using dedicated lines require more DSU/CSU & more complicated routing & switching
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Tags: 802.1q, router, guides, vlan, wan, ip
Bitmindframes Study guides
Spanning Tree Protocol & Layer 2 Redundency.
Layer 2 redundency improves network availability with alternative network paths.
A simple path can be disrupted with little impact.
Redundency is achieved at the distribution & core through additional hardware & alternate paths.
Each Access Layer switch is connected to 2 different Distribution Layer switches.
Each Distribution Layer switch is connected to 2 Core Layer switches.
Spanning Tree Protocol is enabled by default.
Spanning Tree Protocol puts some ports into forwarding & others in blocking.
This prevents Layer 2 switching loops. Spanning Tree Protocol uses a redundant link if the primary fails.
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Tags: vtp, cisco, switch, router, ip, guides
