From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001 From: Sven Eisenhauer Date: Fri, 10 Nov 2023 15:11:48 +0100 Subject: add new repo --- Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/buttons.html | 110 ++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/content.html | 138 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/index.html | 29 +++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/media.html | 21 ++++ 4 files changed, 298 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/buttons.html new file mode 100644 index 0000000..c81be64 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/buttons.html @@ -0,0 +1,110 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + + +
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+ + 2.1 + WAN Technologies Overview 
  + 2.1.4 + WAN encapsulation 
+ + + + + + +
+ + + Data from the network layer is passed to the data link layer for + delivery on a physical link, which is normally point-to-point on a WAN + connection. The data link layer builds a + frame around the network layer data so the necessary checks and + controls can be applied. Each WAN connection type uses a Layer 2 + protocol to encapsulate traffic while it is crossing the WAN link. To + ensure that the correct encapsulation protocol is used, the Layer 2 + encapsulation type used for each router serial interface must be + configured. The choice of encapsulation protocols depends on the WAN + technology and the equipment. Most framing is based on the HDLC + standard.

HDLC framing gives reliable delivery of data over + unreliable lines and includes signal mechanisms for flow and error + control. + The frame + always starts and ends with an 8-bit flag field, the bit pattern + 01111110. Because there is a likelihood that this + pattern will occur in the actual data, the sending HDLC system always + inserts a 0 bit after every five 1s in the data field, so in practice + the flag sequence can only occur at the frame ends. The receiving + system strips out the inserted bits. When frames are transmitted + consecutively the end flag of the first frame is used as the start + flag of the next frame.

+

The address field is not needed for WAN links, which are almost + always point-to-point. The address field is still present and + may be one or two bytes long. The control field indicates the frame + type, which may be information, supervisory, or unnumbered:

+
    +
  • Unnumbered frames carry line setup messages.
    • +
  • Information frames carry network layer data.
    • +
  • Supervisory frames control the flow of information frames and + request data retransmission in the event of an error.
    • +
+

The control field is normally one byte, but will be two bytes for + extended sliding windows systems. Together the address and control + fields are called the frame header. The encapsulated data follows the + control field. Then a frame check sequence (FCS) uses the + cyclic redundancy check (CRC) mechanism to establish a two or four + byte field.

+

Several data link protocols are used, including sub-sets and + proprietary versions of HDLC. + Both PPP + and the Cisco version of HDLC have an extra field in the header to identify the network layer protocol of the encapsulated + data. +

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+ + Web Links

+ + +

WAN

+ + http://www.cisco.com/en/US/tech/tk713/ + tech_topology_and_ network_serv_and_ + protocol_suite_ home.html

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+ + + + \ No newline at end of file diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/index.html b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/index.html new file mode 100644 index 0000000..82a25be --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/index.html @@ -0,0 +1,29 @@ + + + + +Cisco Global Learning Network + + + + + + + + + + + + + + + + <body> + + <p>This page uses frames, but your browser doesn't support them.</p> + + </body> + + + + diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/media.html b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/media.html new file mode 100644 index 0000000..2c823c9 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_4/media.html @@ -0,0 +1,21 @@ + + + + + + +Flash Graphic + + + + + + + + + + + + \ No newline at end of file -- cgit v1.2.3