Skoči na vsebino

RK 2021-22; LDN2 - resitev Starc Aljaz

link ucilnica.fri.uni-lj.si

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Note

Ethernet frame length is not fixed

- en.wikipedia.org

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The Protected Frame field is 1 bit in length. The Protected Frame field is set to 1 if the Frame Body field contains information that has been processed by a cryptographic encapsulation algorithm. The Protected Frame field is set to 1 only within data frames and within management frames of subtype Authentication, and individually addressed robust management frames. The Protected Frame field is set to 0 in all other frames. When the Protected Frame field is equal to 1, the Frame Body field is protected utilizing the cryptographic encapsulation algorithm and expanded as defined in Clause 11. The Protected Frame field is set to 0 in Data frames of subtype Null Function, CF-ACK (no data), CF-Poll (no data), CF-ACK+CF-Poll (no data), QoS Null (no data), QoS CF-Poll (no data), and QoS CF-ACK+CF-Poll (no data) (see, for example, 11.4.2.2 and 11.4.3.1 that show that the frame body needs to be 1 octet or longer to apply the encapsulation).

*- blogs.arubanetworks.com

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Carrier-sense multiple access with collision detection (CSMA/CD) is a media access control (MAC) method used most notably in early Ethernet technology for local area networking. It uses carrier-sensing to defer transmissions until no other stations are transmitting.

- www.google.com

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Omrežje s skupinskim medijem pomeni, da vse naprave vidijo celoten omrežni promet, ne glede na to, kdo ga pošilja. Privzeto naša mrežna kartica odfiltrira vse, kar ni namenjeno našemu naslovu (ali pa na naslov broadcast). Če kartico prestavimo v promiscuous mode (to omogoča večina mrežnih kartic), izklopimo ta filter in lahko vidimo celotni promet, ki prispe do naše mrežne kartice.

Če imamo omrežje z razdelilnikom (hub), torej lahko vidimo celotni promet na omrežju. Kaj pa omrežja s stikalom? “Filter” tukaj postane stikalo, saj posreduje promet le med računalniki, ki dejansko komunicirajo med seboj.

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Zadnja posodobitev: April 11, 2022