CCNA - class C addresing

Author

class C addresing

miami_dude

2003-11-19, 3:04 pm

why is 223.223.223.255 is not a class C address???

thanks a lot
Gourav

Demijohn

2003-11-19, 3:27 pm

It is a Class C address. It's not valid to assign to a host, because it is the broadcast address for the 223.223.223.0 network.

DJ

miami_dude

2003-11-19, 5:06 pm

I've more doubts....cud u help me in finding the answers...

Q1. You are connected to a switchwith the prompt Switch:, after typing in any command and pressing enter your receive the respone "unknown command". You then reboot the switch and get a message saying that "IOS not found". Which of the following is true?

A. NVRAM is corrupted
B. The startup-config file has been deleted
C. The IOS image is missing or corrupted
D. The ROM is corrupted

Q2.Exhibit:
(Router1){BRI0}-----------[ISDN Cloud]-----------{BRI0}(Router2)

Which of the following is the minimum configuration commands required to
bring up the ISDN link shown in graphic.
Note: SPIDs are not required for this switch. (Choose three)

A. Router(config-if)# encapsulation ppp
B. Router(config-if)# isdn switch-type type
C. Router(config-if)# dialer-list, protocol ip permit
D. Router(config-if)# dialer map ip address name name connection number
E. Router(config-if)# ip address subnet mask
F. Router(config-if)# dialer group 1

Q4) What are manangement interface???

You are required to configure the password 'RBCONF1' on the management interface. Which of the following commands will complete the task?

A. Router(config)# enable secret RBCONF1
B. Router(config)# enable password RBCONF1
C. Router(config)# line console 0
Router(config-line)#login
Router(config-line)#password RBCONF1
D. Router(config)# line vty 0
Router(config-line)#login
Router(config-line)#password RBCONF1

Q5) Which of the following describes a location from which a router is configured?

a)After it's installed on the network, a router can be configured from virtual terminals.
b)Upon initial configuration, a router is configured from the virtual terminals.
c)After it's installed on the network, a router can be configured via a modem from the console terminal.
d)Upon initial configuration, a router is configured via a modem using the auxiliary port.

Q6) Which of the following best describes the function of NVRAM?

a)Provides temporary and/or running memory for the router's configuration file while the router is powered on.
b)Stores the router's backup configuration file. The content is retained when you power down or restart.
c)Holds the operating system image and microcode and allows you to update software without removing and replacing chips on the processor.
d)Contains power-on diagnostics, a bootstrap program, and operating system software.

Q7) Which of the following does not describe a function of working storage RAM in a router?

a)A bootstrap program performs tests and then loads the Cisco IOS software into memory.
b)A saved version of the configration file is acessed from NVRAM and loaded into main memory when the router initializes.
c)The EXEC part of the IOS sotware handles packet buffering and the queuing of packets.
d)The operating system image is usually executed from the main RAM and loaded from an input source.

Q8) Why are there two modes of access to router commands on Cisco routers?

a)One mode is for remotely working on the router, while the other mode is for directly working on the router via a console.
b)One mode, which has many automatic sequences, is for new users, while other mode is for experienced users who can issue direct commands.
c)One mode lets a number of users see what's happening on the router, while the other mode lets a few users change how the router operates.
d)One mode is for the initial router configuration and startup, while the other mode is for maintaining, updating, and changing the router after initial startup.

Q8) What are 4 ways network management can be simplified by using the virtual LAN (VLANs)?Choose 4

a) Nework adds, moves and changes are achieved by configuring a port into VLAN
b) VLAN can group several broadcast domains into multiple subnets.
c) As a logical grouping of users, VLANs can be considered independent from there physical of geographical locations.
d) A group of users needing high security can be put into VLAN so that no users outside the VLAN can communicate with 'em.
e)It is no longer needed to install cables to move a user from a new network to another.
f) VLANs allow you to implement multiple layers switching easily.

Q9) What function is served by Datalink LLC layer?

a) provides flow control to the upper layer by means of ready/not ready codes.
b) Support for sequesnce control bits
c) Establishes media independence.
d) Connections between applications running on a LAN

Q10) What does this ACL do???

access-list 101 permit 172.16.1.1 255.255.255.255 any eq 23
access-list 101 ip any any

Q11) You want to stop host 3.3.3.3 from sending any traffic out of physical interface ethernet 1 while allowing all other traffic.You create an access-list:

access-list 2 deny 3.3.3.3

What else must be added to the list to complete the access-list?

a) access-list 2 permit 0.0.0.0
b) access-list 2 permit all
c) access-list 2 permit any 255.255.255.255
d) access-list 2 deny all

Q12) Which of the following are true of HDLC ? choose three

a) Open standard
b) Default serial encapsulation
c) Supports point-to-point and multipoint
d) Supports Stacker compression.

Q13) You've a direct serial link to an adjacent router.You do not have connectivity, and when you run show running-config the o/p says that the serial interface is shutdown. You issue the command: show interface s0.What will be the o/p indicate?

a) serial 0 admin down, line prot up
b) s0 is down, line prot down

Q13) A router with BRI U interface will be used for an ISDN connection.What other device is reqd. to complete this connection?

a) NT2
b) NT1
c) TA
d) TE1
e) TE2
f) None of these

Demijohn

2003-11-19, 5:29 pm

Why don't you post your best "guess" on these first.

miami_dude

2003-11-19, 9:29 pm

First thing, I messed with the numbering of the questions.lets take the questions in order irrespective of the question no given earlier.

Q1 C
Q2 ABE
Q3 A
Q4 A
Q5 B
Q6 A
Q7 C
Q8 ABCD
Q9 ABD
Q10 I guess here source is same as "any"
Q11 No clue
Q12 BCD
Q13 B
Q14 F

dmaftei

2003-11-20, 9:28 am

quote:
Q10) What does this ACL do???

access-list 101 permit 172.16.1.1 255.255.255.255 any eq 23
access-list 101 ip any any

It will make your router frown at you when you enter it. You're missing the protocol in the first statement, and the action in the second statement. Assuming you meant 'ip' in the first statement, you'll have two cases:

1.
access-list 101 permit ip etc...
access-list 101 permit ip any any
This will allow anything.

2.
access-list 101 permit ip etc...
access-list 101 deny any any
This will allow only telnet from 172.16.1.1.

quote:
Q11) You want to stop host 3.3.3.3 from sending any traffic out of physical interface ethernet 1 while allowing all other traffic.You create an access-list:

access-list 2 deny 3.3.3.3

What else must be added to the list to complete the access-list?

a) access-list 2 permit 0.0.0.0
b) access-list 2 permit all
c) access-list 2 permit any 255.255.255.255
d) access-list 2 deny all

b. All access lists end with an implicit 'deny all', so if you want to deny only something, you must first deny the something, then permit anything else. The access list should look like this:

access-list 2 deny 3.3.3.3
access-list 2 permit all

miami_dude

2003-11-20, 9:13 pm

Please confirm my answers for the 14 questions that I posted earlier.

Thanks a lot

Demijohn

2003-11-21, 8:21 am

quote:
Q4) What are manangement interface???

You are required to configure the password 'RBCONF1' on the management interface. Which of the following commands will complete the task?

A. Router(config)# enable secret RBCONF1
B. Router(config)# enable password RBCONF1
C. Router(config)# line console 0
Router(config-line)#login
Router(config-line)#password RBCONF1
D. Router(config)# line vty 0
Router(config-line)#login
Router(config-line)#password RBCONF1

Your answer: A - Correct answer would be C. The Console is generally considered to be the management interface.

quote:
Q6) Which of the following best describes the function of NVRAM?

a)Provides temporary and/or running memory for the router's configuration file while the router is powered on.
b)Stores the router's backup configuration file. The content is retained when you power down or restart.
c)Holds the operating system image and microcode and allows you to update software without removing and replacing chips on the processor.
d)Contains power-on diagnostics, a bootstrap program, and operating system software.

Your answer: B
Correct answer: A - NVRAM is the default location for the running-configuration file. The startup-configuration file gets loaded into NVRAM on initialization typically from Flash.

quote:
Q7) Which of the following does not describe a function of working storage RAM in a router?

Your answer: A, Correct answer:
B (see previous question) and C (maybe, this isn't very clear, but what does it have to do with the question?)

As previously noted the you answered the 2 access list questions incorrectly.

I believe you got the rest correct.

miami_dude

2003-11-21, 2:11 pm

Why is console the managemnet interface???Where can i get further details on managemnet interface???

Demijohn

2003-11-21, 3:20 pm

Well I could be wrong of course, and if anyone else wants to weigh in on this go ahead. I do know that Cisco uses the term loosely, and with a number of modifers (i.e. local management interface, web management interface, network management interface.)

The reasons I go with the console are that it's the only one that works out of the box, it's the default for things like logging and etc, and it's the one you have to go to in a disaster and you can't get in any other way.

You got these questions somewhere, what do they say the answer is?

dmaftei

2003-11-21, 7:17 pm

quote:
Why is console the managemnet interface???Where can i get further details on managemnet interface???

_dude, I would think the "management interface" is a interface used to manage the router. AFAIK Cisco routers don't have some interface designated as "management interface"; the console, any vty or the WEB interface could all be management interfaces. As such, none of the answers is correct. BTW, where did you find these questions? They're kind of weird...

I believe there is some sort of designated "management interface" on switches, but you're asking about routers, right?

miami_dude

2003-11-21, 9:34 pm

Answer given for the management interface question was eanble secret, but i wasnt sure of that question...

Do u think console line is the rite answer for the management interface.

Thanks a lot

dmaftei

2003-11-23, 9:26 am

quote:
Originally posted by miami_dude
Do u think console line is the rite answer for the management interface.

No, I do not think console line is the rite answer; I already told u what I think. But I might be wrong, so you should probably keep asking whether this is the right answer until somebody will confirm it.

Or even better: get a good book about Cisco routers, read it and understand what you read; and bookmark the IOS documentation at www.cisco.com, read as much as you can, and understand what you read.

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