Quản trị mạng Chapter3
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Exam questions
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1 . Callback was designed by Cisco to aid in:
authentication
configuration
negotiation
bill consolidation
2 . Which one of the following is true regarding Multilink PPP?
Multilink PPP can use a secondary link if the primary link is down
Multilink PPP can define interesting and uninteresting traffic
Multilink PPP will always use the secondary link instead of the primary link, if possible
Multilink PPP is unable to use a secondary link
3 . What is the PPP control protocol for IP?
LCP
NCP
LAPB
IPCP
4 . What command would you use for PPP callback?
ppp callback start
ppp callback queue
ppp callback timeout
ppp callback request
5 . Which command shows the result of authentication?
show ppp negotiation
debug ppp negotiation
debug ppp authentication
show ppp authentication
6 . Which two of the following are used to verify and troubleshoot a PPP session?
show interfaces
show PPP
debug PPP negotiation
debug PPP session
7 . What are three PPP LCP features?
Authentication
Compression
Multilink
Multipoint
8 . What are two reasons to use PPP callback?
Security
Cost
Speed
Accuracy
9 . Multilink PPP (MPPP) adds which size headers to the packet fragments for sequencing and so that the fragments can be
reconstructed? Choose three.
1 byte
2 bytes
4 bytes
6 bytes
8 bytes
10 . What is a reason that CHAP authentication is preferred over PAP authentication?
CHAP encrypts the data and uses the MD5 (Message Digest 5) hashing function
CHAP encrypts the password and uses the MD5 (Message Digest 5) hashing function
CHAP makes sure the remote device is spoofing by sending a challenge to the remote device
CHAP does not use up bandwidth because it does not make use of repeated challenges
11 . Which command gives the details for the negotiated parameters during PPP setup?
show ppp negotiation
debug ppp negotiation
debug ppp authentication
debug dialer
12 . What are four PPP options that are negotiated through the LCP?
Callback
Multilink PPP
Accounting
Compression
Authorization
Authentication
Rate adaptation
13 . What is the hexadecimal frame flag value for PPP?
6A
7D
7E
7F
14 . PPP uses which of the following network protocols for negotiation prior to a command being established?
IPCP
PAP
LCP
TCP
15 . What are the four main types of compression that PPP supports?
Compressor
Stacker
Predictor
LZ Compression
MPPC
TCP Header
16 . Which of the following ITU standards are correct: Choose three.
V.34 – 28.8 Kbps
V.34 – 14.4 Kbps
V.34 annex 1201H – 33.6 Kbps
V.90 – 53 Kbps
V.90 – 56 Kbps
17 . By which two methods can callers be authenticated using PPP?
Message digest key
Authentication key
PAP
CHAP
Compression
18 . Given the following debug output, which two statements are true?
The user is authenticating with the privileged mode password "NAS 1".
This is a connection attempt to an async port.
The connection is established on serial interface 3/0.
The client is attempting to setup a Serial Line Internet Protocol connection.
The user is authenticating using CHAP.
19 . What is true regarding Multilink PPP?
Does not fragment the packets and spreads the packets over the separate links
Does not fragment the packets and does not spread the packets over the separate links
Fragments the packets and spreads the fragments over the separate links
Fragments the packets and does not spread the fragments over the separate links
20 . Which of the following does PPP LCP allow for? Choose three.
Callback
Multipoint
Compression
Multilink
21 . One authentication method (PAP, CHAP, MS-CHAP, None) must be common for each side of the link or the link will fail to be
established.
True
False
22 . Which of the following are LCP options? Choose four.
authentication
callback
compression
multipoint
multilink
23 . What are two advantages of Multilink PPP (MLP)?
Supports strong encryption types
Multiple physical interfaces can be cascaded
Increased bandwidth
Multiple routes for redundancy
24 . Which two of the following statements are correct regarding the Multilink PPP (MP) protocol?
MP provides load balancing over multiple WAN links.
MP can identify bundles only through the authenticated name.
MP is a negotiated option only during the LCP phase of PPP.
For MP to bind links, configuring AAA authentication is required.
25 . Regarding Multilink PPP (MPPP), the Cisco 700 series router use _____ byte headers, whereas the Cisco IOS uses ______ byte
headers.
2,6
2,4
4,8
2,8
26 . What is the difference between multipoint and multilink? Choose two.
Multipoint is a single subinterface used to establish multiple PVC connections to multiple physical locations or subinterfaces on a
remote router
Multilink allows packets to be fragmented and sent at the same time over multiple multipoint links at the same time
Multipoint is multiple subinterfaces used to establish multiple PVC connections to multiple physical locations or subinterfaces on a
remote router
Multilink allows packets to be unfragmented and sent at the same time over multiple multipoint links at the same time
27 . What are three PPP authentication methods?
PAP
CHAP
