1. Review the third capture and determine what is happening with the PPP traffic
ID: 3818023 • Letter: 1
Question
1. Review the third capture and determine what is happening with the PPP traffic in this capture. What else is involved?
a. Research one of the protocols relating to PPP and describe it here.
b.describe the traffic: what packets are involved and what is happening? (include source, destination, time of capture)
N/A N/A 20 0.010135 1.094600 N/A N/A 21 0.053377 1.147977 N/A N/A 0.008022 1.155999 22 [Time shift for this packet: 0.000000000 seconds] Epoch Time: 1217905250.00977 1000 seconds. [Time delta from previous captured frame 0.010135000 seconds] [Time delta from previous displayed frame 0.010135000 seconds] [Time since reference or first frame: 1.094600000 seconds Frame Number: 20 Frame Length: 16 bytes (128 bits) Capture Length: 16 bytes (128 bits) [Frame is marked: False] ame is ignored False] [Protocols in frame p lcp] Point Protocol Address: 0xff Control: 0x03 000 ff 03 co 21 0a d5 00 0c 03 2a 6f 4b 03 2a 6f 4b 16 PPP LCP 426 Echo Reply PPP LCP 16 442 Ech Request o PPP LCP 16 458 Echo ReplyExplanation / Answer
1.
22 is the frame number.
Time for the captured and displayed frame is 0.0080221.155999
N/A is the source. It means source is not available.
N/A is the destination. It means destination is not available.
PPP is the protocol.
LCP is used inside the PPP. LCP is used for the link establishment.
16 is packet length.
458 Echo Request means the Link establishment phase.
LCP traffic is passing. LCP packets are used for the establishment, maintenance and terminating the links.
a.
Protocol related to PPP is as follows:
HDLC it stands for high-level data link control. HDLC is used by default and is preferred over the PPP. HDLC and PPP both are used for serial interface. HDLC is also an encapsulation protocol.
HDLC is the cisco proprietary and it only work with the cisco routers and is used for serial interfaces in cisco routers. HDLC is used for serial link establishment in cisco router.
The drawback of HDLC is that it does not provide any means of authentication in establishing the peers.
b.
PPP protocol is used for configuring and establishing the links. Inside PPP NCP and LCP are used. In this scenario LCP is being used. LCP is used for the link establishment. LCP consist of three phases that are establishment, maintenance and terminating. Establishment phase is used to establish the connection, maintenance phase is used in debugging through the links and network and termination phase is used to terminate the connection.
In the given scenario source and destination are not available and LCP is being used inside PPP. And different time for the captured and displayed frame is being provided. For Example, the time for the third capture is 0.0080221.155999. Echo request and reply are used for the link establishment.
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