no index / רשתות קצרצרים

שיטות שונות של פעולת מיתוג (Switching) ע"י הסוויץ'

by Michael · Published אוקטובר 23, 2017 · Updated אוקטובר 23, 2017

מתגים תומכים במספר טכניקות מיתוג שונות. השיטות הן: אחסן-והעבר (Store and Forward), שגר-מיד (Cut-Through) ואחסון-זריז (Fragment-Free). טכניקות אלו מגדירות כיצד המתג, מקבל, מעבד ומעביר מסגרות מידע (Frames).

אחסן-והעבר (Store and Forward)

בשיטה זו, הסוויץ' מעתיק כל מסגרת אתרנט שמגיעה אליו לתוך זיכרון הרכיב, ועושה חישוב של CRC (Cyclic Redundancy Check) על מנת לבדוק האם ישנן שגיאות. במידה וישנה שגיאה, הפריים נזרק, ואם אין טעות הסוויץ' יעביר את הפריים ליעדו. יש לדעת ששיטה זו אמינה מאוד אך גם איטית מכיון שהסוויץ' צריך לטעון ולבדוק פריים שלם לפני העברתו.

שגר-מיד (Cut-Through)

בשיטה זו, הסוויץ' מעתיק לזיכרונו רק את כתובת המק של היעד. שיטה זו מאוד מהירה מכיון שהסוויץ' אינו קורא את הפריים (רק את היעד), עם זאת בשיטה זו ייתכן והסוויץ' יעביר מסגרות עם שגיאות.

אחסון-זריז (Fragment-Free)

בשיטה זו הסוויץ' קורא עד כתובת המק של היעד (64 בייטים בלבד) ולא קורא את כל הפריים, בדרך זו הסוויץ' מאתר את רוב השגיאות (שבד"כ קורות ב- 64 בייטים הראשונים). שיטה זו היא פשרה בין שתי השיטות ומספקת לנו אמינות ומהירות סבירה.

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כתיבת תגובה לבטל

אתר זו עושה שימוש ב-Akismet כדי לסנן תגובות זבל. פרטים נוספים אודות איך המידע מהתגובה שלך יעובד.

אז איך מתחילים ? מאוד פשוט !

לניווט מהיר לצרכי הלימוד שלכם ולהכנה למבחנים, לחצו על אחד מהעיגולים הירוקים:

– מכיל את תכני הלימוד של המגמה באפשרויות שונות. ביניהן – מצגת, טבלת חיפוש, סיכומים, מאמרים ועוד.

מכיל את שלל אפשרויות התרגול שהאתר מציע לטובת הבנת החומר. ביניהן – תרגילי סימולציה, בחנים, תרגול שאלות בגרות לפי נושאים או בגרויות מלאות ועוד.

אחרי שהקפתם את חומר הלימוד, הן בלימוד הן בתרגול והבנה, בשלב השינון תמצאו כרטיסיות תרגול לשינון החומר, סיכומים וכו'.

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