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Detail Form
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1.
According to the diagram, a PPPoE session is initiated by the user from the PC using the username johndoe@isp1.com. This PPPoE session ultimately terminates on the ISP router, using domain based tunneling
on 6400. What is the correct sequence of events which occur during user authentication?
on 6400. What is the correct sequence of events which occur during user authentication?
2.
A Network Administrator is unable to configure a PVC with the value of 8/49. He looks at the running config and notices the following entry for the interface he is working with. What is the likely cause of the problem?interface
ATM0/0/0no ip addressatm vc-per-vp 2048no atm ilmi-keepalive
ATM0/0/0no ip addressatm vc-per-vp 2048no atm ilmi-keepalive
3.
Host 1 and Host 2 are on Ethernet LANs in different buildings. A serial line is installed between two Cisco routers using Cisco HDLC serial line encapsulation. Routers A and B are configured to route IP traffic. Host 1
sends a packet to Host 2. What is the destination MAC address of the packet on Host's 1 Ethernet?
sends a packet to Host 2. What is the destination MAC address of the packet on Host's 1 Ethernet?
4.
Select the group of technologies which are listed in descending order of bandwidth scale:
5.
Host 1 and Host 2 are on Ethernet LANs in different buildings. A serial line is installed between two Cisco routers using Cisco HDLC serial line encapsulation. Routers A and B are configured to route IP traffic. Host 1
sends a packet to Host 2. A line hit on the serial line causes an error in the packet. When this is detected, the retransmission is sent by:
sends a packet to Host 2. A line hit on the serial line causes an error in the packet. When this is detected, the retransmission is sent by:
6.
In ADSL DMT systems, the highest downstream transmit power occurs at what rate/reach combinations?
7.
In DMT DSL transmission systems, what is the effect of turning off half of the available downstream carriers (tones)?
8.
A DSL subscriber reports that the CPE modem untrains and retrains several times each hour, but not at regular
intervals. The subscriber has a DMT modem operating on 10 kft of #26 cable (3 km of 0.4 mm cable). The
provisioned downstream rate is 2 mbps, and the provisioned upstream rate is 256 kbps. When the modem
retrains, the downstream DSL may be as low as 512 kbps. Sometimes manually retraining the modem allows it
to return to a 2 mbps line rate, and sometimes manually retraining the modem does not improve the DSL line
rate. Which options would cause the
intermittent train/untrain symptom as described? (multiple answer)
9.
IDSL and SDSL use what line coding scheme?
10.
A DSL subscriber says that his DSL modem is trained at the subscribed rates, 1024 kbps downstream and 256 kbps upstream, but he has no access to the internet. The internet service was working until today. The modem
remains trained - it is not dropping train or frequently retraining. Manually retraining the modem does not correct the problem. The customer can ping from his PC to the Ethernet interface on the DSL modem, but not
addresses "in the network". Initial troubleshooting shows that the DSL modem can ping the subscriber's PC, but no addresses in the network. What could cause this problem?
remains trained - it is not dropping train or frequently retraining. Manually retraining the modem does not correct the problem. The customer can ping from his PC to the Ethernet interface on the DSL modem, but not
addresses "in the network". Initial troubleshooting shows that the DSL modem can ping the subscriber's PC, but no addresses in the network. What could cause this problem?