4-3: Point-to-Point Flashcards
How does PPP interface with different network layer protocols?
By using separate NCPs
At which layer of the OSI model does multiplexing take place?
Layer 1
Which protocol will terminate the PPP link after the exchange of data is complete?
LCP
Cisco uses what as the default encapsulation?
HDLC
The FCS field in a PPP frame is how many bit(s)?
2 or 4
PAP is very vulnerable to what type of attacks?
Trial-and-error
STDM uses a ________ time slot allowing channels to compete for free space
variable
PPP Link Establishment fails when the receiver sends?
confNAK & confReject
PPP words on any ___________ or ___________ line including HSSI.
Synchronous, Asynchronous
CHAP Authentication is a _____-way handshake.
Three
When configuring Multilink PPP, where is the IP address for the multilink bundle configured?
On a multilink interface
Which PPP option can detect links that are in a looped-back condition?
Magic Number
What PPP authentication method is necessary to login on older systems?
PAP
Serial connections sends data at ___ data bit at a time
1
PPP Link Establishment completed when the receiver sends?
confACK
True / False: You can use both PPP authentication methods at the same time?
True
What are the two authentication methods supported by PPP?
PAP and CHAP
What is the first phase of establishing a PPP session?
Establish the link and negotiate configuration options
If you are connecting to a non-Cisco device, you must use what encapsulation?
PPP
Which layer 1 sharing mechanism is used for two or more channels with one slot per channel?
Time Division Multiplexing
True / False: Once CHAP has successfully authenticated, the authentication process is completed.
False, CHAP uses a periodic authentication challange
What is the third phase of establishing a PPP session?
Negotiate with the network layer to configure layer 3 protocol
Which PPP authentication method is preferred?
CHAP
The Flags field in a PPP frame are how many bit(s)?
1
Which is an advantage of using PPP on a serial link instead of HDLC?
option for authentication
PPP uses what two methods of compression?
Stacker and Prefictor
What is the second phase of establishing a PPP session?
Determine the quality of the link
Which field marks the beginning and end of an HDLC frame?
Flag
What are the tree key standards for serial connections?
RS-232, V.35, HSSI
CHAP does not use a username, is uses what instead?
The device hostname
Which address is used in the Address field of a PPP frame?
A single byte of binary 11111111
What command would you use to indicate if a DCE or DTE cable is attached?
show controllers [interface-name]
The PPP address field is what?
1111 1111 (8 ones)
PAP Authentication is a ___-way handshake.
Two
What two factors affect parallel communication?
Clock Skew & Crosstalk
HDLC supports CDP, but not what other key feature?
Authentication
