Mar 31, 2012

我的第一本 iBook 封面設計 - BGP網路應用 Vol.1


我的第一本 iBook 封面設計,希望可以順利完成…但是看來在台灣要直接從Apple上架販售有一定的難度,可能還是得先找傳統出版社幫忙才行


在ICND1 Vol.1 P.1-167 提到了一個我沒有注意到的SFP規格(1000BASE-BX10-D/U),原來現在可以利用一蕊的Fiber同時提供傳送及接收的方向,很久以前,在這種規格尚未出現之前,我們通常會使用一種fiber transceiver來達成這種目標,主要的原因就是為了可以減少fiber蕊數的使用,現在看來是把這種技術直接整合進了SFP中。
1000BASE-BX10-D and 1000BASE-BX10-U SFP for Single-Fiber Bidirectional Applications
The 1000BASE-BX-D and 1000BASE-BX-U SFPs, compatible with the IEEE 802.3ah 1000BASE-BX10-D and 1000BASE-BX10-U standards, operate on a single strand of standard SMF.
A 1000BASE-BX10-D device is always connected to a 1000BASE-BX10-U device with a single strand of standard SMF with an operating transmission range up to 10 km.
Figure 3. Cisco 2-channel 1000BASE-BX optical SFP
The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two devices as depicted in Figure 3: 1000BASE-BX10-D transmits a 1490-nm channel and receives a 1310-nm signal, whereas 1000BASE-BX10-U transmits at a 1310-nm wavelength and receives a 1490-nm signal. Note in Figure 3 the presence of a wavelength-division multiplexing (WDM) splitter integrated into the SFP to split the 1310-nm and 1490-nm light paths.
Figure 4. Bidirectional Transmission of a Single Strand of SMF
The GLC-BX-D and GLC-BX-U SFPs also support digital optical monitoring (DOM) functions according to the industry-standard SFF-8472 multisource agreement (MSA). This feature gives the end user the ability to monitor real-time parameters of the SFP, such as optical output power, optical input power, temperature, laser bias current, and transceiver supply voltage.

2-channel 1000BASE-BX10-D for Single-Fiber Bidirectional Applications
The 2-channel 1000BASE-BX-D SFP module, also known as Compact SFP, integrates two IEEE 802.3ah 1000BASE-BX10-D interfaces in one SFP module. The GLC-2BX-D is always connected to two 1000BASE-BX10-U interfaces over two single strands of standard SMF with an operating transmission range up to 10km.
GLC-2BX-D is designed to connect to any standard-based Customer Premises Equipment (CPE) in FTTx links.

1000BASE-BX10-D downstream bidirectional single fiber; with DOM
2-channel 1000BASE-BX10-D downstream bidirectional single fiber; with DOM
1000BASE-BX10-U upstream bidirectional single fiber; with DOM

Packet Tracer 5.3 Network

如果各位正在上CCNA的課程或是在準備CCNA考試,但是平時可能手邊沒有設備可以練習的話,可以先考慮使用Packet Tracer來練習,以下是相關資源可以下載的地方:

Packet Tracer 5.3 network simulation software splash screen
Packet Tracer is a powerful network simulator that can be utilized in training for CCNATM and CCNPTM certification exam by allowing students to create networks with an almost unlimited number of devices and to experience troubleshooting without having to buy real CiscoTMrouters or switches.
The current version of Packet Tracer supports an array of simulated Application layer protocols (HTTP, DNS, …), as well as basic routing with RIP, OSPF, and EIGRP, to the extent required by the currentCCNATM curriculum. With the introduction of version 5.3, several new features were added, including BGP, which is part of the CCNPTMcurriculum.
While Packet Tracer aims to provide a realistic simulation of functional networks, the application itself utilizes only a small number of features found within the actual hardware running a current Cisco IOSTM.

CCNA labs - LAN Switching

Lab 1 : Basic switch setupDownload packet tracer 5.3 basic switch setup lab
Lab 2 : Configuring switch interfacesDownload packet tracer 5.3 interface configuration lab
Lab 3 : VLAN and VTP configurationDownload packet tracer 5.3 vlan and vtp lab
Lab 4 : Port security Download packet tracer 5.3 vlan  and vtp lab
Lab 5 : Troubleshooting Coming soon

CCNA labs - IP Routing

Lab 6 : Basic router setupDownload packet tracer 5.3 basic  router setup lab
Lab 7 : Static routesComing soon
Lab 8 : RIP v2Coming soon
Lab 9 : TroubleshootingComing soon

CCNA labs - WAN

Lab 10 : Configuring serial linksComing soon
Lab 11 : HDLCDownload packet tracer 5.3 HDLC lab
Lab 12 : PPPDownload packet tracer 5.3 PPP lab
Lab 13 : Frame RelayDownload packet tracer 5.3 Frame Relay lab

CCNP labs

Lab 14 : Radius authenticationDownload packet tracer 5.3 radius lab
Lab 15 : Configuring EtherchannelDownload packet tracer 5.3 radius lab