{"id":476323,"date":"2023-08-09T07:28:31","date_gmt":"2023-08-09T07:28:31","guid":{"rendered":""},"modified":"2023-09-05T11:12:28","modified_gmt":"2023-09-05T11:12:28","slug":"collision","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/collision\/","title":{"rendered":"Va ch\u1ea1m"},"content":{"rendered":"<p>Va ch\u1ea1m l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m thi\u1ebft y\u1ebfu trong c\u00e1c l\u0129nh v\u1ef1c v\u1eadt l\u00fd, khoa h\u1ecdc m\u00e1y t\u00ednh v\u00e0 m\u1ea1ng. N\u00f3i chung, n\u00f3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c tr\u01b0\u1eddng h\u1ee3p khi hai ho\u1eb7c nhi\u1ec1u th\u1ef1c th\u1ec3 c\u1ed1 g\u1eafng chi\u1ebfm c\u00f9ng m\u1ed9t kh\u00f4ng gian c\u00f9ng m\u1ed9t l\u00fac. Trong c\u00e1c m\u1ea1ng m\u00e1y t\u00ednh, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong b\u1ed1i c\u1ea3nh m\u00e1y ch\u1ee7 proxy, xung \u0111\u1ed9t ch\u1ee7 y\u1ebfu \u0111\u1ec1 c\u1eadp \u0111\u1ebfn t\u00ecnh hu\u1ed1ng hai thi\u1ebft b\u1ecb c\u1ed1 g\u1eafng g\u1eedi m\u1ed9t g\u00f3i d\u1eef li\u1ec7u \u0111\u1ed3ng th\u1eddi qua m\u1ea1ng.<\/p>\n<h2>Ngu\u1ed3n g\u1ed1c v\u00e0 s\u1ef1 \u0111\u1ec1 c\u1eadp \u0111\u1ea7u ti\u00ean c\u1ee7a va ch\u1ea1m<\/h2>\n<p>X\u00e9t v\u1ec1 \u00fd ngh\u0129a khoa h\u1ecdc, kh\u00e1i ni\u1ec7m va ch\u1ea1m c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng nghi\u00ean c\u1ee9u ban \u0111\u1ea7u v\u1ec1 v\u1eadt l\u00fd c\u1ed5 \u0111i\u1ec3n, trong \u0111\u00f3 n\u00f3 th\u1ec3 hi\u1ec7n s\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa hai ho\u1eb7c nhi\u1ec1u h\u1ea1t ho\u1eb7c v\u1eadt th\u1ec3. Tuy nhi\u00ean, ngu\u1ed3n g\u1ed1c xung \u0111\u1ed9t c\u00f3 li\u00ean quan h\u01a1n v\u1ec1 m\u1eb7t m\u1ea1ng m\u00e1y t\u00ednh \u0111\u00e3 xu\u1ea5t hi\u1ec7n c\u00f9ng v\u1edbi s\u1ef1 ra \u0111\u1eddi c\u1ee7a c\u00f4ng ngh\u1ec7 Ethernet v\u00e0o \u0111\u1ea7u nh\u1eefng n\u0103m 1970.<\/p>\n<p>\u0110\u01b0\u1ee3c ph\u00e1t minh b\u1edfi Robert Metcalfe v\u00e0 Xerox PARC, Ethernet s\u1eed d\u1ee5ng m\u1ed9t nguy\u00ean t\u1eafc \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0110a truy c\u1eadp nh\u1eadn bi\u1ebft s\u00f3ng mang v\u1edbi t\u00ednh n\u0103ng ph\u00e1t hi\u1ec7n va ch\u1ea1m (CSMA\/CD). C\u01a1 ch\u1ebf n\u00e0y gi\u00fap \u0111i\u1ec1u ch\u1ec9nh vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u trong m\u1ea1ng b\u1eb1ng c\u00e1ch cho ph\u00e9p nhi\u1ec1u thi\u1ebft b\u1ecb ki\u1ec3m tra xem m\u1ea1ng c\u00f3 b\u1eadn hay kh\u00f4ng tr\u01b0\u1edbc khi th\u1eed g\u1eedi g\u00f3i d\u1eef li\u1ec7u. N\u1ebfu hai thi\u1ebft b\u1ecb t\u00ecnh c\u1edd truy\u1ec1n \u0111\u1ed3ng th\u1eddi th\u00ec xung \u0111\u1ed9t s\u1ebd x\u1ea3y ra v\u00e0 m\u1ed7i thi\u1ebft b\u1ecb s\u1ebd \u0111\u1ee3i m\u1ed9t kho\u1ea3ng th\u1eddi gian ng\u1eabu nhi\u00ean tr\u01b0\u1edbc khi th\u1eed l\u1ea1i.<\/p>\n<h2>Hi\u1ec3u va ch\u1ea1m: M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1<\/h2>\n<p>Trong m\u1ea1ng m\u00e1y t\u00ednh, xung \u0111\u1ed9t x\u1ea3y ra khi c\u00e1c thi\u1ebft b\u1ecb n\u1eb1m tr\u00ean c\u00f9ng m\u1ed9t ph\u00e2n \u0111o\u1ea1n m\u1ea1ng g\u1eedi c\u00e1c g\u00f3i d\u1eef li\u1ec7u \u0111\u1ed3ng th\u1eddi. Xung \u0111\u1ed9t c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t m\u1ea1ng v\u00ec ch\u00fang khi\u1ebfn c\u00e1c g\u00f3i li\u00ean quan b\u1ecb m\u1ea5t, bu\u1ed9c ch\u00fang ph\u1ea3i g\u1eedi l\u1ea1i, t\u1eeb \u0111\u00f3 g\u00e2y ra s\u1ef1 ch\u1eadm tr\u1ec5 v\u00e0 gi\u1ea3m hi\u1ec7u qu\u1ea3 truy\u1ec1n d\u1eef li\u1ec7u.<\/p>\n<p>Mi\u1ec1n xung \u0111\u1ed9t l\u00e0 m\u1ed9t ph\u00e2n \u0111o\u1ea1n c\u1ee7a m\u1ea1ng n\u01a1i c\u00f3 th\u1ec3 x\u1ea3y ra xung \u0111\u1ed9t g\u00f3i. Trong c\u00e1c m\u1ea1ng Ethernet d\u1ef1a tr\u00ean trung t\u00e2m c\u0169 h\u01a1n, to\u00e0n b\u1ed9 m\u1ea1ng th\u01b0\u1eddng l\u00e0 m\u1ed9t mi\u1ec1n xung \u0111\u1ed9t duy nh\u1ea5t, ngh\u0129a l\u00e0 xung \u0111\u1ed9t c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i. Tuy nhi\u00ean, m\u1ea1ng Ethernet hi\u1ec7n \u0111\u1ea1i s\u1eed d\u1ee5ng b\u1ed9 chuy\u1ec3n m\u1ea1ch v\u00e0 b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn c\u00f3 th\u1ec3 t\u00e1ch m\u1ea1ng th\u00e0nh nhi\u1ec1u mi\u1ec1n xung \u0111\u1ed9t nh\u1ecf h\u01a1n, do \u0111\u00f3 l\u00e0m gi\u1ea3m t\u00e1c \u0111\u1ed9ng ti\u1ec1m \u1ea9n c\u1ee7a xung \u0111\u1ed9t.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a va ch\u1ea1m: Va ch\u1ea1m ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n<p>Trong m\u00f4i tr\u01b0\u1eddng m\u1ea1ng chia s\u1ebb nh\u01b0 Ethernet, khi nhi\u1ec1u thi\u1ebft b\u1ecb c\u1ed1 g\u1eafng truy\u1ec1n c\u00e1c g\u00f3i d\u1eef li\u1ec7u c\u00f9ng m\u1ed9t l\u00fac, c\u00e1c g\u00f3i n\u00e0y s\u1ebd can thi\u1ec7p l\u1eabn nhau, g\u00e2y ra xung \u0111\u1ed9t. Giao th\u1ee9c CSMA\/CD \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n nh\u1eefng xung \u0111\u1ed9t n\u00e0y v\u00e0 b\u00e1o hi\u1ec7u cho c\u00e1c thi\u1ebft b\u1ecb b\u1ecb \u1ea3nh h\u01b0\u1edfng ng\u1eebng truy\u1ec1n, \u0111\u1ee3i m\u1ed9t kho\u1ea3ng th\u1eddi gian ng\u1eabu nhi\u00ean r\u1ed3i th\u1eed truy\u1ec1n l\u1ea1i.<\/p>\n<p>Vi\u1ec7c ph\u00e1t hi\u1ec7n v\u00e0 qu\u1ea3n l\u00fd c\u00e1c xung \u0111\u1ed9t n\u00e0y l\u00e0 t\u1ef1 \u0111\u1ed9ng, \u0111\u01b0\u1ee3c x\u1eed l\u00fd b\u1edfi ph\u1ea7n c\u1ee9ng v\u00e0 giao th\u1ee9c m\u1ea1ng, ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i kh\u00f4ng th\u1ec3 nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c. Tuy nhi\u00ean, trong c\u00e1c m\u1ea1ng c\u00f3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp cao, xung \u0111\u1ed9t th\u01b0\u1eddng xuy\u00ean c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng m\u1ea1ng ch\u1eadm l\u1ea1i \u0111\u00e1ng ch\u00fa \u00fd.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a va ch\u1ea1m<\/h2>\n<ul>\n<li>M\u1ea5t g\u00f3i: Khi x\u1ea3y ra xung \u0111\u1ed9t, c\u00e1c g\u00f3i d\u1eef li\u1ec7u ban \u0111\u1ea7u \u0111ang truy\u1ec1n s\u1ebd b\u1ecb h\u1ecfng v\u00e0 b\u1ecb m\u1ea5t.<\/li>\n<li>Truy\u1ec1n l\u1ea1i: Sau khi x\u1ea3y ra xung \u0111\u1ed9t, c\u00e1c thi\u1ebft b\u1ecb c\u1ea7n truy\u1ec1n l\u1ea1i c\u00e1c g\u00f3i b\u1ecb m\u1ea5t, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u qu\u1ea3 m\u1ea1ng.<\/li>\n<li>Suy gi\u1ea3m hi\u1ec7u su\u1ea5t m\u1ea1ng: T\u1ef7 l\u1ec7 xung \u0111\u1ed9t cao c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn gi\u1ea3m hi\u1ec7u su\u1ea5t m\u1ea1ng v\u00ec m\u1ed9t ph\u1ea7n \u0111\u00e1ng k\u1ec3 b\u0103ng th\u00f4ng m\u1ea1ng c\u00f3 th\u1ec3 b\u1ecb ti\u00eau t\u1ed1n do truy\u1ec1n l\u1ea1i.<\/li>\n<li>Mi\u1ec1n xung \u0111\u1ed9t: V\u1edbi vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb m\u1ea1ng hi\u1ec7n \u0111\u1ea1i nh\u01b0 b\u1ed9 chuy\u1ec3n m\u1ea1ch v\u00e0 b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn, m\u1ea1ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh nhi\u1ec1u mi\u1ec1n xung \u0111\u1ed9t, gi\u1ea3m t\u00e1c \u0111\u1ed9ng ti\u1ec1m \u1ea9n c\u1ee7a xung \u0111\u1ed9t.<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i va ch\u1ea1m<\/h2>\n<ol>\n<li>\n<p><strong>Va ch\u1ea1m d\u1ef1a tr\u00ean tranh ch\u1ea5p<\/strong>: \u0110i\u1ec1u n\u00e0y x\u1ea3y ra khi hai ho\u1eb7c nhi\u1ec1u n\u00fat c\u1ed1 g\u1eafng truy\u1ec1n c\u00f9ng l\u00fac tr\u00ean m\u1ea1ng d\u00f9ng chung. N\u00f3 ph\u1ed5 bi\u1ebfn trong c\u00e1c m\u1ea1ng kh\u00f4ng d\u00e2y.<\/p>\n<\/li>\n<li>\n<p><strong>Va ch\u1ea1m d\u1ef1a tr\u00ean s\u1ef1 ph\u1ea3n \u00e1nh<\/strong>: Nh\u1eefng hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y x\u1ea3y ra do tr\u1edf kh\u00e1ng kh\u00f4ng kh\u1edbp trong m\u1ea1ng, khi\u1ebfn t\u00edn hi\u1ec7u ph\u1ea3n x\u1ea1 v\u00e0 va ch\u1ea1m v\u1edbi c\u00e1c t\u00edn hi\u1ec7u ti\u1ebfp theo.<\/p>\n<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>Ki\u1ec3u<\/th>\n<th>G\u00e2y ra<\/th>\n<th>Ti\u1ebfn l\u00ean<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D\u1ef1a tr\u00ean s\u1ef1 tranh ch\u1ea5p<\/td>\n<td>Truy\u1ec1n \u0111\u1ed3ng th\u1eddi<\/td>\n<td>M\u1ea1ng kh\u00f4ng d\u00e2y<\/td>\n<\/tr>\n<tr>\n<td>D\u1ef1a tr\u00ean s\u1ef1 ph\u1ea3n \u00e1nh<\/td>\n<td>Tr\u1edf kh\u00e1ng kh\u00f4ng ph\u00f9 h\u1ee3p<\/td>\n<td>M\u1ea1ng c\u00f3 d\u00e2y<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>S\u1eed d\u1ee5ng va ch\u1ea1m: V\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p<\/h2>\n<p>M\u1eb7c d\u00f9 xung \u0111\u1ed9t th\u01b0\u1eddng \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1 trong m\u1ea1ng do kh\u1ea3 n\u0103ng l\u00e0m gi\u1ea3m hi\u1ec7u qu\u1ea3 v\u00e0 t\u1ed1c \u0111\u1ed9 nh\u01b0ng ch\u00fang l\u00e0 m\u1ed9t ph\u1ea7n c\u1ed1 h\u1eefu c\u1ee7a ki\u1ebfn tr\u00fac m\u1ea1ng d\u00f9ng chung, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u1ea1ng kh\u00f4ng d\u00e2y. Do \u0111\u00f3, nhi\u1ec1u giao th\u1ee9c m\u1ea1ng \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1ec3 ph\u00e1t hi\u1ec7n v\u00e0 qu\u1ea3n l\u00fd xung \u0111\u1ed9t, bao g\u1ed3m CSMA\/CD cho m\u1ea1ng Ethernet c\u00f3 d\u00e2y v\u00e0 CSMA\/CA (Carrier Sense Multiple Access with Collision Prevention) cho m\u1ea1ng kh\u00f4ng d\u00e2y.<\/p>\n<p>Tuy nhi\u00ean, xung \u0111\u1ed9t th\u01b0\u1eddng xuy\u00ean c\u00f3 th\u1ec3 ch\u1ec9 ra c\u00e1c s\u1ef1 c\u1ed1 nh\u01b0 t\u1eafc ngh\u1ebdn m\u1ea1ng, ph\u1ea7n c\u1ee9ng b\u1ecb l\u1ed7i ho\u1eb7c s\u1ef1 c\u1ed1 c\u1ea5u h\u00ecnh. Nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y th\u01b0\u1eddng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft b\u1eb1ng c\u00e1ch t\u0103ng b\u0103ng th\u00f4ng m\u1ea1ng, thay th\u1ebf ho\u1eb7c s\u1eeda ch\u1eefa c\u00e1c thi\u1ebft b\u1ecb m\u1ea1ng b\u1ecb l\u1ed7i ho\u1eb7c ph\u00e2n chia m\u1ea1ng th\u00e0nh c\u00e1c mi\u1ec1n xung \u0111\u1ed9t nh\u1ecf h\u01a1n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng b\u1ed9 chuy\u1ec3n m\u1ea1ch ho\u1eb7c b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn.<\/p>\n<h2>Va ch\u1ea1m v\u00e0 c\u00e1c thu\u1eadt ng\u1eef li\u00ean quan: Ph\u00e2n t\u00edch so s\u00e1nh<\/h2>\n<p>Trong khi xung \u0111\u1ed9t l\u00e0 m\u1ed9t thu\u1eadt ng\u1eef ph\u1ed5 bi\u1ebfn trong m\u1ea1ng m\u00e1y t\u00ednh, c\u00f3 nh\u1eefng thu\u1eadt ng\u1eef li\u00ean quan kh\u00e1c c\u00f3 th\u1ec3 g\u00e2y nh\u1ea7m l\u1eabn:<\/p>\n<table>\n<thead>\n<tr>\n<th>Thu\u1eadt ng\u1eef<\/th>\n<th>S\u1ef1 \u0111\u1ecbnh ngh\u0129a<\/th>\n<th>So s\u00e1nh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Va ch\u1ea1m<\/td>\n<td>Khi hai ho\u1eb7c nhi\u1ec1u thi\u1ebft b\u1ecb truy\u1ec1n d\u1eef li\u1ec7u \u0111\u1ed3ng th\u1eddi g\u00e2y nhi\u1ec5u<\/td>\n<td>Xung \u0111\u1ed9t x\u1ea3y ra \u1edf l\u1edbp v\u1eadt l\u00fd v\u00e0 c\u00f3 th\u1ec3 g\u00e2y m\u1ea5t g\u00f3i<\/td>\n<\/tr>\n<tr>\n<td>Ph\u00e1t tin<\/td>\n<td>M\u1ed9t ph\u01b0\u01a1ng th\u1ee9c truy\u1ec1n d\u1eef li\u1ec7u trong \u0111\u00f3 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb tr\u00ean m\u1ea1ng<\/td>\n<td>Kh\u00f4ng gi\u1ed1ng nh\u01b0 xung \u0111\u1ed9t, ph\u00e1t s\u00f3ng l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c truy\u1ec1n d\u1eef li\u1ec7u c\u00f3 ch\u1ee7 \u00fd<\/td>\n<\/tr>\n<tr>\n<td>M\u1ea5t g\u00f3i<\/td>\n<td>Khi m\u1ed9t g\u00f3i d\u1eef li\u1ec7u kh\u00f4ng \u0111\u1ebfn \u0111\u01b0\u1ee3c \u0111\u00edch<\/td>\n<td>M\u1ea5t g\u00f3i c\u00f3 th\u1ec3 do va ch\u1ea1m, nh\u01b0ng c\u0169ng c\u00f3 th\u1ec3 do c\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c nh\u01b0 t\u1eafc ngh\u1ebdn m\u1ea1ng ho\u1eb7c ph\u1ea7n c\u1ee9ng b\u1ecb l\u1ed7i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Vi\u1ec5n c\u1ea3nh t\u01b0\u01a1ng lai: S\u1ef1 va ch\u1ea1m v\u00e0 c\u00e1c c\u00f4ng ngh\u1ec7 m\u1edbi n\u1ed5i<\/h2>\n<p>Khi c\u00f4ng ngh\u1ec7 m\u1ea1ng ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, vi\u1ec7c qu\u1ea3n l\u00fd xung \u0111\u1ed9t v\u1eabn l\u00e0 m\u1ed9t l\u0129nh v\u1ef1c nghi\u00ean c\u1ee9u quan tr\u1ecdng. C\u00e1c c\u00f4ng ngh\u1ec7 m\u1ea1ng m\u1edbi h\u01a1n nh\u01b0 Gh\u00e9p k\u00eanh ph\u00e2n chia theo t\u1ea7n s\u1ed1 tr\u1ef1c giao (OFDM) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ea1ng di \u0111\u1ed9ng 4G v\u00e0 5G c\u0169ng nh\u01b0 c\u00e1c giao th\u1ee9c kh\u00f4ng d\u00e2y ti\u00ean ti\u1ebfn nh\u01b0 WiFi 6 (802.11ax) \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 x\u1eed l\u00fd xung \u0111\u1ed9t t\u1ed1t h\u01a1n v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t m\u1ea1ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c t\u00ecnh hu\u1ed1ng c\u00f3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp cao.<\/p>\n<h2>M\u00e1y ch\u1ee7 xung \u0111\u1ed9t v\u00e0 proxy<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng vai tr\u00f2 trung gian trong lu\u1ed3ng l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp internet. H\u1ecd ch\u1ea5p nh\u1eadn c\u00e1c y\u00eau c\u1ea7u k\u1ebft n\u1ed1i, chuy\u1ec3n ti\u1ebfp c\u00e1c y\u00eau c\u1ea7u n\u00e0y \u0111\u1ebfn m\u00e1y ch\u1ee7 \u0111\u00edch v\u00e0 sau \u0111\u00f3 tr\u1ea3 l\u1ea1i d\u1eef li\u1ec7u cho ng\u01b0\u1eddi y\u00eau c\u1ea7u ban \u0111\u1ea7u. V\u1edbi vai tr\u00f2 qu\u1ea3n l\u00fd l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng, m\u00e1y ch\u1ee7 proxy c\u0169ng c\u00f3 th\u1ec3 \u0111\u00f3ng vai tr\u00f2 qu\u1ea3n l\u00fd xung \u0111\u1ed9t.<\/p>\n<p>C\u1ee5 th\u1ec3, b\u1eb1ng c\u00e1ch h\u1ee3p nh\u1ea5t c\u00e1c y\u00eau c\u1ea7u v\u00e0 ph\u1ea3n h\u1ed3i, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3m t\u1ed5ng s\u1ed1 g\u00f3i \u0111\u01b0\u1ee3c g\u1eedi qua m\u1ea1ng, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng x\u1ea3y ra xung \u0111\u1ed9t. H\u01a1n n\u1eefa, m\u1ed9t s\u1ed1 m\u00e1y ch\u1ee7 proxy n\u00e2ng cao c\u0169ng c\u00f3 th\u1ec3 tri\u1ec3n khai c\u00e1c ch\u00ednh s\u00e1ch \u0111\u1ecbnh h\u00ecnh l\u01b0u l\u01b0\u1ee3ng ho\u1eb7c Ch\u1ea5t l\u01b0\u1ee3ng d\u1ecbch v\u1ee5 (QoS) \u0111\u1ec3 qu\u1ea3n l\u00fd l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng t\u1ed1t h\u01a1n v\u00e0 gi\u1ea3m thi\u1ec3u t\u00e1c \u0111\u1ed9ng c\u1ee7a xung \u0111\u1ed9t.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 va ch\u1ea1m, vui l\u00f2ng tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ul>\n<li><a href=\"https:\/\/www.amazon.com\/Computer-Networking-Top-Down-Approach-6th\/dp\/0132856204\" target=\"_new\" rel=\"noopener nofollow\">M\u1ea1ng m\u00e1y t\u00ednh: C\u00e1ch ti\u1ebfp c\u1eadn t\u1eeb tr\u00ean xu\u1ed1ng c\u1ee7a Kurose v\u00e0 Ross<\/a><\/li>\n<li><a href=\"https:\/\/ieeexplore.ieee.org\/document\/5772960\" target=\"_new\" rel=\"noopener nofollow\">IEEE Xplore: T\u1ed5ng quan v\u1ec1 tr\u00e1nh va ch\u1ea1m trong m\u1ea1ng kh\u00f4ng d\u00e2y<\/a><\/li>\n<li><a href=\"https:\/\/www.amazon.com\/Network-Guide-Networks-Jill-West\/dp\/133756933X\" target=\"_new\" rel=\"noopener nofollow\">M\u1ea1ng+ H\u01b0\u1edbng d\u1eabn v\u1ec1 M\u1ea1ng c\u1ee7a Jill West, Tamara Dean v\u00e0 Jean Andrews<\/a><\/li>\n<\/ul>","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476323","wiki","type-wiki","status-publish","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Collision: An In-depth Analysis<\/mark>","faq_items":[{"question":"What is a collision in computer networking?","answer":"<p>A collision in computer networking refers to a situation where two or more devices attempt to transmit data simultaneously on a shared network. This can cause interference, resulting in the loss of the original data packets. Collisions are managed by protocols like CSMA\/CD (Carrier Sense Multiple Access with Collision Detection) for wired Ethernet networks and CSMA\/CA (Carrier Sense Multiple Access with Collision Avoidance) for wireless networks.<\/p>"},{"question":"How does a collision affect network performance?","answer":"<p>Collisions can degrade network performance as they cause packet loss, leading to retransmissions and delays. In high-traffic networks, frequent collisions can consume a substantial portion of network bandwidth, reducing overall efficiency.<\/p>"},{"question":"What are contention-based collisions and reflection-based collisions?","answer":"<p>Contention-based collisions occur when two or more nodes attempt to transmit data simultaneously on a shared network, common in wireless networks. Reflection-based collisions happen due to impedance mismatches in a network, causing signals to reflect and collide with subsequent signals in wired networks.<\/p>"},{"question":"How can collisions be managed or reduced?","answer":"<p>Collisions are an inherent part of shared network architectures, but their impact can be managed. Solutions include increasing network bandwidth, repairing or replacing faulty network devices, and segmenting the network into smaller collision domains using switches or routers.<\/p>"},{"question":"How are collisions related to proxy servers?","answer":"<p>Proxy servers act as intermediaries for internet traffic, which can help reduce the total number of packets being sent over a network and lower the likelihood of collisions. Some advanced proxy servers can implement traffic shaping or Quality of Service (QoS) policies to better manage network traffic and mitigate the impact of collisions.<\/p>"},{"question":"What technologies are being developed to handle collisions better?","answer":"<p>As networking technology evolves, newer technologies like Orthogonal Frequency Division Multiplexing (OFDM) and advanced wireless protocols like WiFi 6 (802.11ax) are designed to better handle collisions and improve network performance, especially in high-traffic situations.<\/p>"},{"question":"How can I learn more about collisions in networking?","answer":"<p>For further insights, you can refer to reputable resources such as \"Computer Networking: A Top-Down Approach\" by Kurose and Ross, the IEEE Xplore article on \"Collision Avoidance in Wireless Networks,\" or the book \"Network+ Guide to Networks\" by Jill West, Tamara Dean, and Jean Andrews. These sources provide in-depth information on collisions and related topics in networking.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476323","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476323\/revisions"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476323"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}