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11.11 最強折扣反應熱烈!
優惠延長一週!最後倒數,立即行動!
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11.11 最強折扣反應熱烈!
優惠延長一週!最後倒數,立即行動!
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什麼是虛電路?

虛擬電路是在實體網路基礎架構上邏輯建立的通訊路徑。它允許透過模擬專用實體連接在網路中的設備之間傳輸資料。

虛電路如何運作?

當建立虛擬電路時,所涉及的網路設備會在發送方和接收方之間建立預定的路由或路徑。此路徑暫時保留用於通訊會話。透過虛擬電路發送的資料包遵循特定的路由,確保有序傳送和可靠通訊。

是否有不同類型的虛電路?

是的,虛擬電路主要有兩種類型:交換虛擬電路 (SVC) 和永久虛擬電路 (PVC)。 SVC 根據需要動態建立,並在通訊會話結束後拆除。另一方面,PVC 是預先配置的,即使在不使用時也保持在原位,從而可以加快後續會話的設定時間。

虛電路有哪些常見應用?

虛電路廣泛應用於各種通訊場景。它們通常用於廣域網路 (WAN),以在地理位置分散的位置之間建立可靠的連線。虛擬電路也用於虛擬私人網路 (VPN),以透過公共網路提供安全且私密的通訊。

虛擬電路可以在有線和無線網路中使用嗎?

是的,虛擬電路可以在有線和無線網路中使用。底層網路基礎設施,無論是基於有線乙太網路或基於WiFi或蜂窩網路等無線技術,都可以支援虛擬電路的建立和運作。

可以同時建立多個虛電路嗎?

是的,您可以同時建立多個虛擬電路。每個虛擬電路獨立運行,並且可以有自己獨特的功能和參數,例如頻寬分配、服務品質設定和安全配置。這種靈活性允許不同設備和網路端點之間進行高效並發的通訊。

虛電路標識符 (VCI) 的作用是什麼?

VCI 是唯一標識網路內虛擬電路的數值。網路設備使用它將傳入的資料包引導到適當的虛擬電路進行處理和傳送。 VCI 確保封包與其對應的虛擬電路正確關聯。

虛電路建立後可以修改參數嗎?

是的,建立虛擬電路後可以修改其參數。例如,您可以調整指派的頻寬、修改服務品質設定或變更安全性配置。然而,這些變更通常需要虛擬電路中涉及的網路設備之間的協調,以確保平穩過渡而不中斷正在進行的通訊。

虛電路和分組交換之間有什麼關係?

虛擬電路依靠分組交換技術透過網路傳輸資料。當您透過虛擬電路傳送資料時,資料會被分成更小的資料包。這些資料包包含有關虛擬電路的信息,例如虛擬電路標識符(VCI)以及實際資料。資料包交換允許這些資料包在網路中獨立路由並在目的地重新組裝。

虛電路和電路交換網路有什麼差別?

虛擬電路在分組交換網路之上運行,而電路交換網路在通訊會話期間建立專用實體連接。在電路交換網路中,資源專門為已建立的連線分配,而虛擬電路則會根據需求動態共用網路資源。

雲端運算中使用虛擬電路嗎?

是的,虛擬電路在雲端運算中發揮著至關重要的作用。基於虛擬電路建構的虛擬私人網路 (VPN) 可實現雲端資源和用戶端之間的安全且私密的通訊。此外,虛擬電路也用於資料中心網絡,以在虛擬機器、容器和其他雲端基礎設施元件之間建立可靠的連接。

不同網路的設備之間可以建立虛電路嗎?

是的,不同網路的設備之間可以建立虛電路。這在地理上分散的位置需要進行通訊的廣域網路 (WAN) 中特別有用。透過利用虛擬電路,不同網路上的設備可以建立模擬直接實體鏈路的邏輯連接。

如果封包在虛電路中遺失會發生什麼事?

如果封包在虛擬電路中遺失,則有適當的機制來處理這種情況。一種方法是實作錯誤檢測和重傳技術。當資料包遺失或到達時發生錯誤,接收設備可以要求發送方重傳資料包以確保其正確傳送。這有助於保持通信的完整性。

虛擬電路可以動態建立還是總是預先配置的?

虛擬電路可以動態建立或預先配置,具體取決於類型。交換虛擬電路 (SVC) 是按需動態設定的。當發起通訊會話時,網路設備會為此會話建立臨時虛擬電路。另一方面,永久虛擬電路 (PVC) 是預先配置的,即使在未主動使用時也保持在原位,從而可以加快後續會話的連接設定時間。

虛電路和數據報網路有什麼不同?

在虛電路網路中,資料傳輸之前就建立了預定的路徑,確保有序傳送。資料包遵循此路徑並按順序傳送。相較之下,資料封包網絡,例如互聯網的互聯網協定(IP),使用無連線方法。每個資料包均獨立處理,並根據目標位址動態路由,無需建立預定義路徑。

虛擬電路可以用於語音和視訊通話等即時應用嗎?

是的,虛擬電路可用於語音和視訊通話等即時應用。虛擬電路提供的有序傳送和可靠性使其適合時間敏感的通訊。透過預留網路資源並遵循特定路由,虛擬電路可以確保低延遲和一致的服務質量,這對於即時應用至關重要。

虛擬電路需要專用硬體嗎?

不,虛擬電路不需要專用硬體。它們在現有網路基礎設施(例如路由器和交換器)之上運行,可以處理必要的資料包路由和轉送。雖然虛擬電路依賴網路設備,但它們不需要專門或專用的硬體組件來運作。

虛電路能否確保資料傳輸的安全?

虛電路本身並不能保證資料傳輸的安全性。但是,它們可以用作更大的安全解決方案的一部分。為了安全通信,虛擬專用網路 (VPN) 在虛擬電路中利用加密和封裝技術來保護資料的機密性和完整性。透過將虛擬電路與加密協定結合,可以建立安全的通訊通道。

點對點 (P2P) 網路中是否使用虛電路?

虛電路在 P2P 網路中並不常用。 P2P 網路基於分散式架構運行,其中設備直接相互通信,而不是透過中央網路基礎設施。 P2P 網路通常依賴其他協議,例如 BitTorrent 協議,該協議使用不同的方法進行資料傳輸和路由。

可以透過無線連接建立虛電路嗎?

是的,可以透過無線連線建立虛擬電路。無線網絡,例如WiFi或蜂窩網絡,可以支援虛電路的建立和操作。透過利用無線通訊協定和具有適當功能的網路設備,可以在無線網路環境中建立和使用虛擬電路。

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