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32 Cards in this Set
- Front
- Back
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isdn b-channels can use ____ connections
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PPP
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ISDN uses in or outbound signaling?
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Outbound
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ISDN standards were developed by?
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ITU-T
international telecommunication union telecommuniccation standardization sector. |
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protcol isdn uses to establish a call or signaling?
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q.921-lapd (link access procedure on d-channel.
q.931-ISDN network layer between terminal and switch. both of these are Q series protocols. |
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what is inband signaling?
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both the b and d channels share the same path way.
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ISDN is packet or circuit switched?
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ISDN is circuit switched.
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d channel traffic is based on LAPD which is a verison of HDLC.
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true.
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ISDN BRI contains 2 subframes. Each frame conatins?
Each BRI frame is ____ bits? # of frames transmittted a sec? |
8 bits from B1
8 bits from b2 2 bits from d 6 bits overhead 48 bits. 4000 frames. |
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ISDN layer and signaling used?
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ISDN uses layer 1, 2, 3.
L3-Q.931 & IP L2-LAPD & PPP/HDLC L1-i.430 for bri i.431 for PRI. |
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SPDI has what info
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Line setup and configuration that identifies the user to the service provdier.
Used with BRI |
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SPID does not have to be used when using what switch-type
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At&t 5ESS
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SPID is used to idenitify?
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Each B-channel on a BRI.
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ISDN switch-type can be a global and interface config.
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true
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what is teh cpmmand to config ISDN BRI.
assign spid? |
(config)#isdn switch-type basic-ni.
(config-if)#isdn spid1 [spid-number] [ldn] (config-if)#isdn spid2 [spid-number] [ldn] |
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commands to config isdn PRI.
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(config)#isdn switch-type primary-net5
(config)#controller t1 (config-controller)#framing (config-controller)#linecode b8zs (config-controller)#pri-group [timeslots_range] (config)#interface serial [port:channel] {s0/0:23} |
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DDR interesting traffic is defined with the _____?
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dialer-list
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DDR process.
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1. route to destination is determined
2. interesting packet dicate DDR call 3. dialer info is looked up 4. traffic is transmitted. 5. when timer expires call is terminated. |
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deifference betwen legacy ddr and ddr profiles?
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legacy ddr is used when 1 set of dialer parameters are applied to an interface. Very basic.
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commands to config ISDN bri. legacy
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(config)#isdn switch-type basic-ni
(config)#interface bri 0 (config-if)#isdn spid1 1222222 555556 (config-if)#1222222 5555557 and define a static route*** |
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commands to config interesting traffic. legacy
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#dialer-list 1 protocol ip permit
interface bri 0 dialer-group 1 ** interface bri 0 dialer-idle-timeout 120 dialer map ip 192.168.1.3 moscow |
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bri interface is set up the same as a serial interface using the encapsulation ppp command and authenication.
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true
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to config dialer information. (complex)
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without ACLS
#dialer-list 1 protocol ip permit. with ACLs #dialer-list 2 protocol ip list 101 #access-list 101 deny tcp any any eq ftp (config-if)#dialer-group 1 (config-if)#dialer-map ip [next-hop-address] [hostname] [speed 56-64] broadcast [# to dial] |
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dialer-group is a # between?
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1-10
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dialer-profile is made of?
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1.dailer-interface
2.dialer pool- a group of one or more physical interfaces associated with one ore more interfaces. 3. physical interfaces |
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debug isdn q931 is used for
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viewing layer 2 isdn call setup exchanges.
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the command #debug isdn q921. will give you a bunch of numbers what are the meaning of these?
0x05 0x02 0x07 0x0F |
0x05- indicates a call setup message.
0x02 indicates a call proceeding message. 0x07- indicates a call connect message 0x0F-indicates a connect ack message. |
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ISDN switch-type is?
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essential for all ISDN BRI interface connections.
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why are static routes preferred over dynamic routes for ISDN connections?
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cause dynamic routes may cause the router constantly dial to transmit updates.
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command to determine if the ISDN link is up.
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#show isdn status
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why most routers specify the ISDN switch-type?
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switches use various implementations of Q.931
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what command will display current call info, including the called number.
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#show isdn active
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commad to see what the isdn timer is set to?
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#show dialer
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