- Home
- Networking
- CCNA Routing and Switching 200-105
81.
An enterprise uses Cisco IOS routers and DSL connections to local ISPs for their
retail locations. The ISPs require the use of PPPoE. The following output listed comes
from one such router (R1). Which of the following answers are true about the configuration on Router R1 and its current PPPoE state? (Choose two answers.)
R1# show pppoe session
1 client session
Uniq ID PPPoE RemMAC Port VT VA State
SID LocMAC VA-st Type
N/A 1 0200.0000.3333 Gi0/0 Di1 Vi1 UP
0200.0000.3003 UP
- A.The configuration includes PPPoE commands under interface virtual-access 1.
- B.Dialer interface 1 and virtual-access 1 are bound together.
- C.Interface G0/0 is using MAC address 0200.0000.3333.
- D.The PPPoE session is currently working.
- Answer & Explanation
- Report
Answer : [B and D]
Explanation :
Explanation :
|
The show pppoe session command lists many key facts about a current PPPoE
session. As for the correct answers, the State of UP on the far right confirms that
the PPPoE session is working correctly. Also, the listing of the Di1 (Dialer1) and Vi1
(Virtual-access 1) interfaces implies that the two interfaces are bound by the PPPoE
session. As for the incorrect answers, MAC 0200.0000.3333 is in use, but by the ISP router. The heading lines list RemMAC (Remote MAC) above and LocMAC (Local MAC) below, so it is the lower of the two MAC addresses (0200.0000.3003) that is used by the local router, R1. Also, the PPPoE configuration is added to the dialer interface and the physical interface (G0/0 in this case), but the virtual-access interface is not directly configured. Instead, IOS generates its configuration from the configuration listed under the dialer interface. |
82.
An enterprise uses Cisco IOS routers and DSL connections to local ISPs for their
retail locations. The ISPs require the use of PPPoE. A network engineer connects to
the console of one router at a retail office, issues the show pppoe session command,
and the router just returns a command prompt, with no lines of output. If you knew
the problem was related to the configuration on the local router, which one of the
four following areas would be the best area to recommend for your colleagues to
investigate in their next troubleshooting step?
- A.Look at the commands on the physical Ethernet interface
- B.Look at the dialer interface commands specific to PPP
- C.Look at the commands specific to IPv4 address learning
- D.Look at the commands in the running-config file for the virtual-access interface
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
|
The show pppoe session command lists a short group of messages about each
PPPoE session once the router is trying to establish that session. However, a router
does not even attempt to start a PPPoE session until PPPoE has been enabled on the
physical interface using the pppoe enable command. (Note that the pppoe-client
dial-pool-number number interface subcommand on the physical interface causes
IOS to automatically add the pppoe enable command as well.) Until these commands
are added, the router makes no attempt to create a PPPoE session, and as a result, the
show pppoe session command lists no output at all. For the incorrect answers, if the dialer interface's commands related to PPP were incorrect or missing, there might be a problem, but those problems would not result in no output at all from the show pppoe session command. Instead the command would list some status messages. Similarly, any errors in the configuration related to IP address learning would not prevent the show pppoe session command from listing output. Finally, the virtual-access interface does not have any specific configuration; its configuration is generated by the router. |
83.
Sify is a host with IP address 10.1.1.1 in subnet 10.1.1.0/24. Which of the following are things that a standard IP ACL could be configured to do? (Choose two
answers.)
- A.Match the exact source IP address.
- B.Match IP addresses 10.1.1.1 through 10.1.1.4 with one access-list command without matching other IP addresses.
- C.Match all IP addresses in Sify’s subnet with one access-list command without matching other IP addresses.
- D.Match only the packet’s destination IP address.
- Answer & Explanation
- Report
Answer : [A and C]
Explanation :
Explanation :
| Standard ACLs check the source IP address. The address range 10.1.1.1– 10.1.1.4 can be matched by an ACL, but it requires multiple access-list commands. Matching all hosts in Barney’s subnet can be accomplished with the access-list 1 permit 10.1.1.0 0.0.0.255 command. |
84.
Which of the following answers list a valid number that can be used with standard
numbered IP ACLs? (Choose two answers.)
- A.1987
- B.2187
- C.187
- D.87
- Answer & Explanation
- Report
Answer : [A and D]
Explanation :
Explanation :
| The range of valid ACL numbers for standard numbered IP ACLs is 1–99 and 1300–1999, inclusive. |
85.
Which of the following wildcard masks is most useful for matching all IP packets in
subnet 10.1.128.0, mask 255.255.255.0?
- A.0.0.0.0
- B.0.0.0.31
- C.0.0.0.240
- D.0.0.0.255
- E0.0.15.0
- F.0.0.248.255
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| 0.0.0.255 matches all packets that have the same first three octets. This is useful when you want to match a subnet in which the subnet part comprises the first three octets, as in this case. |
|
|
||||||||||||||||||||||||||||
