Share your ICND1 v3.0 Experience

Just finished the exam. got 930. Thanks to everyone that makes this forum possible. 60% of the questions are from here.
regarding the ipv6 address question, it is as I said:
11111100. so option B.
and the question was, “how does it start a unique address in ipv6”.

other questions I can remember:
– meaning of “5” in “exec-timeout 5” = minutes to wait after disconnection
– what a switch would do if receives a frame with same target MAC add and destination (and the MAC is already in the mac table). = I chose that it will send the frame back through same port.
– how many ipv4 addresses can be assigned to an interface = only 1.
– which VLANs Ids are reserved = I chose 0 and 1

Typical labs: security, ACL, NTP and NAT. In the labs I had to use the “show cdp neigh” because there was no info about the interfaces.

Good luck everyone and Thanks.

@PL413r

Morning PL…..YES!! I see, BUSY_BUSY you are!!!! CRUNCHING TIME!!!! But thank you so much for taking time to back me up!!!! So we are on same page except that I have to check on that one ( Q-unique ipv6 address ) for my self!! TILL it SYNC in my HEAD!!!!!! ( lol )

I just find this:
The localhost (loopback) address, 0:0:0:0:0:0:0:1, and the IPv6 unspecified address, 0:0:0:0:0:0:0:0, are reduced to ::1 and ::, respectively.

Unspecified = Unique??? I DO BELIEVE YOU ARE RIGHT!!!!

PL413r Did you book yet for the TEST??

@albacete
Thanks for sharing it!
If the question was “how does it start a unique “LOCAL” address in ipv6″ It COULD be B.
because
1111:1100 = 0xFC which is a “start” for Unique local address
EX:
fc00::/7 Unique local address

@CISCOTTE
I book it for upcoming week, Not safe to give more details here.
Once i take i will let everyone knows how it goes.

@CISCOTTE
About 576 question
Answer A is correct
Explain: In order for the interface to receive ip dynamically, the “ip address dhcp” command show be entered in place of “no ip address”.

@PL413r You’re 100% RIGHT – Thanks!!!!!

@CISCOTTE
Those labs are a VERY GOOD find thanks!
In those dumps you have many possibilities for the real test SIMs.
These can really help getting through the SIMs easily.

@PL413r

YES! what is good about that one, it EXPLAIN HOW in which order/step we have to approach the troubleshooting of the Network – HELPING a lot for the concept!!!!! ( BESIDE U!!!! lol! )

Hey guys Im back, let get discussing

@PL413r

DID you notice comment from: albacete November 18th, 2016

REGARDING:( He Said )

Regarding the ipv6 address question, it is as I said:
11111100. so option B.
and the question was, “how does it start a unique address in ipv6”.

other questions I can remember:
– meaning of “5” in “exec-timeout 5” = minutes to wait after disconnection

– what a switch would do if receives a frame with same target MAC add and destination (and the MAC is already in the mac table). = I chose that it will send the frame back through same port.

– how many ipv4 addresses can be assigned to an interface = only 1.

– which VLANs IDs are reserved = I chose 0 and 1

@Albacete

Thank you & CONGRAT!!!!

By chance did you get these 2: ( From a old post ) still NOT CLEAR Q.???

– How does 6qp4 works?
A) Both ends must support IPv4?
B) Both ends must support IPv6 and IPv4?
C) One of end must be confifured with IPv4?

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
A) dhcp pool
B) nat translation
C) dinamic nat

I had those two questions in my exam.
I went for one end but I have since researched it.
The cisco way is different from the real life
I will get you the source later
you need IPv4 tunnel to move Ipv6, you need to think of a real tunnel both ends will need ipv4.
both ends will need ipv6 sent to the interface before going thru IPv4 tunnel. In the exam you will need to select i think 3 options.

10.10.10.1 to 10.10.10.20 is dynamically translated by nat, in my exam i went with the wrong dynamic(which is dhcp).
so it a nat choosen dynamically

@Ciscotte
I got those:
– How does 6qp4 works?
B. Both ends must support…

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
answers were:
a. nat pool
b. dynamic nat
(rest is irrelevant). I went for answer (a)

@CISCOTTE
Abbout:
”
other questions I can remember:
– meaning of “5” in “exec-timeout 5” = minutes to wait after disconnection (CORRECT)

– what a switch would do if receives a frame with same target MAC add and destination (and the MAC is already in the mac table). = I chose that it will send the frame back through same port. (If the MAC is in MAC address table it will foward to that port if not in MAC table it floods all ports except the one he use to send the frame, otherwise it discards the frame)

– how many ipv4 addresses can be assigned to an interface = only 1. (CORRECT)

– which VLANs IDs are reserved = I chose 0 and 1 (CORRECT)

@PL413r & albacete and icnd11istough

DOUBLE CHECKING MY CONFIDENCE B4 the DD ( sometimes soon!!! ) – Thanks to you ALL!!!!

@PL413r What you thing about that one?

GUYS! ( albacete & icnd11istough ) Q. WAS: DHCP Pool OR NAT Pool OPTION???l

What is the FINAL T/F answer on that one:

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
A) dhcp pool < ?
B) nat translation
C) dinamic nat

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
answers were:
a. nat pool
b. dynamic nat < ?

@CISCOTTE

What is the FINAL T/F answer on that one:
Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0 (It should be like: ip nat pool POOL_NAME 10.10.10.1 10.10.10.20 NETMASK 255.255.255.0)
What is the question?
A) dhcp pool
B) nat translation
C) dinamic nat

Router # ip nat pool POOL_NAME 10.10.10.1 10.10.10.20 NETMASK 255.255.255.0 (this command creates a nat pool to be applied to a inside interface)
answers were:
a. nat pool X
b. dynamic nat

Here are some of the new 100-105 Qs I saw:

Q) What is a successful ping:
A) the Cisco IOS ping command sends five echo messages, with a timeout of 2 seconds. If the command does not receive an echo reply within 2 seconds, the command considers that message to be a failure, and the command lists a period. If a successful reply is received within 2 seconds, the command displays an exclamation point. So, in this first command, the first echo reply timed out, whereas the other four received a matching echo reply within 2 seconds.

Source: Cisco ICND1 100-105 Chapter 23: IPv4 Troubleshooting Tools 545

Q) What is the ping character for a unknown packet
A) ?

http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-software-releases-121-mainline/12778-ping-traceroute.html

“?” is the actual answer

@ PL413r

You’re 100% RIGHT regarding the POOL config! HOWEVER none of this 2 Showed QUESTIONS have the structure of a ” POOL/Name ” – DO I MISS SOMETHING??? THANKS PL

@Jabroni > First Thanks!

Q) What is the ping character for a unknown packet
A) ? ( YES 100% )
SEE: https://supportforums.cisco.com/discussion/11347506/cause-ping-unknown-packet-type

@PL413r – What you thing DO I’M OFF the TRACK???

@icnd11istough & Albacete

Why BOTH of you had same QUESTION and DIFFERENT Answer Options?????

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
A) dhcp pool < ?
B) nat translation
C) dinamic nat

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
answers were:
a. nat pool
b. dynamic nat < ?

Does anyone have link to new CBT Nuggets for ICND?

Are those passleader dumps the real deal? I am studying the material, but would like to know for backup purposes.

@Maceo can you please share with us the CBTNuggets videos link..?
thank you and Congrats.

@Faisal Khan
I purchased a one month subscription to CBT nuggets. 100-105 is 20 hours and it took me a couple weeks to watch them all and follow along on GNS3. It was absolutely the best $85 I have spent all year. The videos covered 95% of the test.

@CISCOTTE

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
(not enough to know the right answer but this is most likely a ip nat pool for inside interface since the range is in RFC 1918)
A) dhcp pool
B) nat translation x (guess depends on question)
C) dinamic nat x (guess depends on question)

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
(not enough but if i had to schoose on these too It would be nat pool since it doesnt have any command saying otherwise)
answers were:
a. nat pool X (guess)
b. dynamic nat < ?

@CISCOTTE

You’re 100% RIGHT regarding the POOL config! HOWEVER none of this 2 Showed QUESTIONS have the structure of a ” POOL/Name ” – DO I MISS SOMETHING??? THANKS PL

ip nat pool POOL_NAME 10.10.10.1 10.10.10.20 NETMASK 255.255.255.0

POOL_NAME is a name you choose for the nat pool it can be anything!

I woud say is C) dynamic nat !!! becouse dynamic nat is maping many to many addresses !!! many inside local to many inside global addresses !!! Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0 in this command are given many addesses in nat pool and dynamic nat is maping many to many addresses, static nat is maping one to one and nat overload is maping many to few addresses or many to one address !!! ansfer B is not saying much to me

@PL413r

Thanks PL, I’m 100% do agree with you except, but there is NO any kind of Pool Name!?

Router#ip nat pool ********* 10.10.10.1 10.10.10.20 NETMASK 255.255.255.0

Anyway, lets forget about this question! FOR NOW!!! I’M BUGGING OUT!!!!TEST is coming and I’m stressing out over so little!!!!

Please, keep me posted!!!!

@Starter

Thank you, I have to thing about now!!!!!

I hope to pass tomorrow :S

@Sam Sepiol GOOD LIKE!!!!

@Sam Sepiol GOOD LUCK!!!! SORY for my TYPO!!!!!!!

Sam share some questions when you finisch (: i hoppe you gonna pass !!! i am taking exam am december 16 (: gonna do the same !!!

questions on 1918, ntp and ipv6. Multicast address for nodes not routers. That icmp question came up..i picked two seconds..

On the nat sim, it had the 127 address in the access-list, so would the answer be interesting traffic rather than mis config in the nat? as per dave’s sims?

Read the odem book and videos online. Read the material and understand. About ten new questions…also there was 63 questions in total..

Also some of the choices in the multiple choice questions are not in the icnd1 material 101 or the 105 e.g private vlan, span ports hrsp..

@Ned

…63 Questions + 2Sim?

@ciscotte

63 in total

@PL413r
@Starter

Guys,after ” REFLECTION ” I do believe you are RIGHT regarding (( I woud say is C) dynamic nat !!! )) GOT CONFUSE with DHCP POOL!!!!!!

5. Which command is used to build DHCP pool?
A. ip dhcp conflict
B. ip dhcp-server pool DHCP
C. ip dhcp pool DHCP <
D. ip dhcp-client pool DHCP

Router(config)# ip dhcp pool name –
http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfdhcp.html

@Ned

Thanks N!

@Ned

DID YOU have this Q.?

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
A) dhcp pool < ?
B) nat translation
C) dinamic nat

Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
answers were:
a. nat pool
b. dynamic nat < ?

Good to luck to you guys…now back studying test day is getting closer!

@PL413r

Morning PL!!!! DID YOU BOOK!?

@CISCOTTE

FAILLING IS NOT AN OPTION!!!!!

@CISCOTTE
Yes bro booked a month ago!
Revising stuff to see if i forgot anything 🙂

@CISCOTTE
Sorry good afternoon!

@PL413

HI PL, SEE, is what I HEARD:
” The EXAMs will be updated on 25 November “

@PL413r

I WILL TAKE IT THIS WEEK!!!

@CISCOTTE
cant be man! I was updated in august this year, where did you see it?

@PL413r

….I just CALL to my TESTING CENTER: They told me NOT TRUE!!!! 4SURE!!!!!

Where are you PL, in ASIA, AFRICA or NEXT 2ME@TRUMP WOLD??? lol!!

However< I'm going to DOUBLE CHECK on other source and will KEEP YOU POSTED!!!

@PL413r

Where are you PL, in ASIA, AFRICA or NEXT 2ME@TRUMP WOLD??? lol!!
BECAUSE THAT COULD BE TRUE in OVERSEA!!!!?

@CISCOTTE
Same continent as you but down south (jungle,samba,canaval) get it?

@CISCOTTE
If i were you I would take the test before january 2017, what if Mr Trump decide that nobody needs to be certified anymore lol.

@PL413r

Regarding this UPGRADE EXAM on the 25:

Just wants to OPOLOGIZE for this ” mind bugging!!!” I just try to WARN you NOT to scare you!!! Some time is better to AVOID some people talk! – SORY AGAIN PL!!!!

PLEASE KEEP POSTED!!!! Thanks!!!!

@PL413r

…Same continent as you but down south (jungle,samba,canaval) get it? HO_HO,HO I see!

I have been there, BRASIL, BOLIVIA & PEROU!!!! YES!!! SO, así, la casa se habla español ,COOL!

@CISCOTTE
No need to apologize…
Here…Si habla portuguese! lol

@PL413r

PL what is that JOKE!??lol_lol!!!!
” If i were you I would take the test before january 2017, what if Mr Trump decide that nobody needs to be certified anymore lol.”

YOU REALLY MAKE ME lol!!!…BUT, so you won’t take it B4 NEXT MONTH??NO WAY!CAN’T WAIT!!

@PL413r

Please!!!! WHEN ARE TAKING IT???

@PL413r
Please!!!! WHEN ARE ” YOU ” TAKING IT???

@PL413r

When you get can Chance, may CONFIRM that SIM ( Default Gateway ) what answers is correct?
From: ICND_1-PACKAGE\Simulations

Cause, when I DO:” sh r ” I don’t see the encapsulation? SO, because we don’t see that imply is ” misconfigured “??? STRANGE?

And ” A ” DOES NOT mactch its Answer from the bottom of the PKT sim?
A. The VLAN encapsulation is misconfigured on the router subinterfaces.

A. The next hop router address for the default route is incorrectly configured.
B. Default route pointing to ISP router is not configured on Router R1.
C. Default route pointing to ISP router is configured with AD of 225.
D. Router R1 configured as DHCP client is not receiving default route via DHCP from ISP router.

@PL413r

Sorry, the package from Dave if I’M correct???

this week my friend! on my way to ccent,ccna,ccnp,ccie! lol

CISCOTTE
what is the PKT name?

@PL413r

( Default Gateway ) I did sh r, sh ip int br, sh ip route, sh cdp nei …..This one had issue!??

CISCOTTE
I dont have that lab, The ones I have are ACLs, DHCP, NAT, NTP and Security SIMs.

@PL413r

YOU SAID!!! ” this week my friend! on my way to ccent,ccna,ccnp,ccie! lol ” WHAT GOING ON???

DID PASS TODAY?????

@PL413r

YOU GOT THIS FILE ON WHICH PAGE# and DATE??

@PL413r

YOU GOT THIS FILE ON WHICH PAGE# and DATE??

@PL413r

The download was: Simulations.zip ( 8Files ) 10/24/16

CISCOTTE
I dont remember man…

@PL413r

Thanks PL, don’t worry …..I went back to every page but the DropBox content was GONE!!!

Test length time plz? I heard it is 65 minute exctual time.

Some one asked for CBT Nuggets video tutorials. peep this. remove the spaces and good learning.

http ://www. du222. net/tutorials/1884226-cisco-ccent-ccna-icnd1-100-105. html

@Steven tripe

CONGRAT!!!!! BY chance what were the SIM/SIMLet???

@PL413r

Morning PL! This is the package I was talking about with ” issueS” on: Default Gateway PKT
https://www.dropbox.com/s/a5puza67n5cyu6k/ICND_1_PACKAGE.zip?dl=0

If you get chance, what you thing? NO RUSH!!!!

@CISCOTTE
Thanks 😉
I will have a look on the issues Default Gateway PKT too.

@Steven tripe
Congratulations 🙂

@Steven trippe

CONGRAT!!!!! BY chance what were the SIM/SIMLet???…ALSO did you have some Questions about > private vlan, span ports???

Thanks!!!!

@All
Steven trippe is fake…
@CISCOTTE
Will take a look at it later on

@PL413r

FAKE!!!! was not sure but NOW, I’M – HE’S A SPY SALER?!!!!!

@ALL ALL ALL

Steven trippe HE’s FAKE!!!! was not sure but NOW, I’M – HE’s A SPY SALER?!!!!!

WHATCH OUT HE WILL CHANGE HIS NAME!!!!!

Any syslog questions?

I look on Default Gateway PKT too!!! ansfer A is not becouse the default route on R2 is good configured pointing to R1 g0/0 ( S* 0.0.0.0/0 [1/0] via 192.168.10.2) . you cann see that with command: show ip route static on R2 router.ansfer B is right !! becouse when you run command on router R1: show ip route there is no default route 0.0.0.0/0 !!!when you run command show ip route 209.165.200.225 its say % Network not in table!!!so R1 cann not comunicate with isp server becouse he dont know where to send the packet .when you run command show IP PROTOCOLS on R1 and R2 you gonna see that they are running routing protocol RIP and the are excaiging their networks.When you run the same command on ISP router nothing is display that is becouse ISP router is nor running any routing protocol and he is not sending hes directly conected route and hes default route to other routers in network.

@Starter

First thanks for your input!!!

2) My point is Answer (A) is NOT even the (A) The Answer that he has on the bottom of the
PKT IS> (A. The VLAN encapsulation is misconfigured on the router subinterfaces.)

THAT ANSWER IS NOT IN THE ANSWER OPTIONS!!!

3)What is YOUR the ANSWER??? A,B,C or D – For now I have no answer!!!!

Q.What could be an issue?
A. The next hop router address for the default route is incorrectly configured.

B. Default route pointing to ISP router is not configured on Router R1.

C. Default route pointing to ISP router is configured with AD of 225.

D. Router R1 configured as DHCP client is not receiving default route via DHCP from ISP router.

Thanks anyway!!!!

@CISCOTTE, ANSWER B is Correct, if you enter the default Route pointing to ISP Router on R1, R1 will be able to ping ISP Server and the traffic flow starts.

@ANYONE_ANYONE

I don’t know if is matter of CULTURE or DOUBLE TALK but I still very confuse regarding of the real meaming of ” interesting traffic ” I know I will read more about it!!!!

BUT FOR NOW: Can some one tell me in ” PLAIN ENGLISH “

@shadows

Thanks! I have to look at that one again!!!

But for sure when all the users cannot reach the internet sites: we should check on the router connecting to the ISP to see if it has a ” default route ” pointing to the ISP or NOT( sh ip r)

@CISCOTTE
run this command at R1
R1(config)#ip route 0.0.0.0 0.0.0.0 g0/1 1
it will create a default route to ISP router and fix the problem

Here are the new questions that I have collected from the forum. Please let me know if there is anything to add not found in the downloads.

Question: meaning of “5” in “exec-timeout 5
Answer: minutes to wait after disconnection

Question: how many ipv4 addresses can be assigned to an interface
Answer: 1

Question: which VLANs IDs are reserved
Answer: 0, 1

Question: What is the purpose of flow control??
A) To ensure data is retransmitted if an acknowledgement is not received
B) To reassemble segments in the correct order at the destination device
C) To provide a means for the receiver to govern the amount of data sent by the sender
D) To regulate the size of each segment
Answer: C

Question: If primary and secondary root switches with priority 16384 both experience catastrophic losses, which teritary switch can take over ?
a. switch with priority 20480
b. switch with priority 8192
c. switch with priority 4096
d. switch with priority 12288
Answer: C

Question: Successful Ping:
Answer: the Cisco IOS ping command sends five echo messages, with a timeout of 2 seconds. If the command does not receive an echo reply within 2 seconds, the command considers that message to be a failure, and the command lists a period. If a successful reply is received within 2 seconds, the command displays an exclamation point.

Question: What is the ping character for a unknown packet
Answer: ? <- actual character

Question: unique ipv6 address
A .00000000
B 11111100
C 11111111
Answer: B

Question: how do you bypass password on cisco device
A. reset
b. 0x2142
Answer: B

Question: CEF is enabled what will be automatically disable
Answer: ????
– Fast switching
– RIP
– IP …

Question: what is ip nat pool 10.0.0.0 10.0.0.5 255.255.x.x
Answer: sounds like it’s a wildcard mask so for the poll would be something like…10.0.0.0 0.0.0.7

Question: Select two (2) statements that are true about IPV6 unique local addresses
A. ….identical to IPV4 private addresses
B. uses FFC00::/7 as prefix
C. XXXXXX
D. *mentions something about global config or router / not entirely sure
Answer: B

Question: Why would you configure a floating static route
Answer: A floating static route floats or moves into and out of the IP routing table depending on whether the better (lower) administrative distance route learned by the routing protocol happens to exist currently. Basically, the router ignores the static route during times when the better routing protocol route is known.

Question: how does a switch differ from a hub
Answer:
– a switch does not decrease the number collision domains
– a switch track MAC addresses of directly connected devices

Question: 6to4:
Answer:
– 2 nodes need to support IPv4
– on point-to-point only

Question: Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
Answer:
A) dhcp pool
B) nat translation x (guess depends on question)
C) dinamic nat x (guess depends on question)

Question: Router # ip nat pool 10.10.10.1 10.10.10.20 255.255.255.0
Answer:
a. nat pool X (guess)
b. dynamic nat < ?

Question: Which command is used to build DHCP pool?
Answer:
A. ip dhcp conflict
B. ip dhcp-server pool DHCP
C. ip dhcp pool DHCP <
D. ip dhcp-client pool DHCP

B is correct!
Why? Starter explained it well!

no you did not pass it looser, cause you only sell free available stuff.

@PLR413r

Thanks PL, I understood but the point that I try to make is that: the answer from PKT IS 100% WRONG (A )

Thank for your confirmation!!! (B)

@Starter

Just wants to say, SORRY!!!

I just read your explanation again and didn’t realize that you were RIGHT (B) .
But just like I said to PL413r, the point that I try to make is that: the answer from PKT IS 100% WRONG (A ) and I though that it was me! That I was on the wrong track!!!
– THANKS AGAIN!!

what is wrong with Steven trippe link (pg 10)? Seems to have good material to me.

I just passed my 200-105 exam using VCE Dumps of VceTest. I got exactly same questions in my exam that they have at https://www.vcetests.com/200-105-vce.html

Package Include:
Dumps Updated on the 17th of November 2016
ICND1 (100-105) = 239Qs and 201Qs
ICND2 (200-105) = 110Qs and 204Qs
Latest Dumps in Both PDF & VCE Format.
Working VCE Player
All LABS TOPOLOGIES for Packet Tracer 6.0.1
All time EMAIL Support for any querry.
You will also get free updates for 60 Days, starting from your contribution date.

If anyone interesting let me know.
FYI = wanninayakegcb at gmail dot com

Review ansfer to your question :

Question: CEF is enabled what will be automatically disable
Answer: ????
– Fast switching
– RIP
– IP …
Ansfer is Fast switching (:

becouse they are 3 ways cisco switch forward frames : process switching , fast switching and CEF( cisco express forwarding) CEF swiching is default switching on new switches !!! when CEF is enabled fast switching is turn of . what you need to know is that for process switching every frame who enters on switch port switch need to look in table to see where to forward the frame and run the CPU. for fast switching lookup and cpu is made only for first frame if others frames have the same destination address they are forward out of same port .NOTE that cisco CEF use FIB table and adjacency table (:

Question: Select two (2) statements that are true about IPV6 unique local addresses
A. ….identical to IPV4 private addresses
B. uses FFC00::/7 as prefix
C. XXXXXX
D. *mentions something about global config or router / not entirely sure
Answer: B

do someone know why is ansfer B right ansfer ???? becouse i am no sure that ansfer B is corect

@PL413r Morming PL!!!

Q. If primary and secondary root switches with priority 16384 both experience catastrophic losses, which teritary switch can take over ?
A) switch with priority 20480?
B) switch with priority 8192
C) switch with priority 4096 ?
D) switch with priority 12288

ANSWER >16384+4096 = 20480 ???? I READ SOMEWHERE & LOST THE LINK???????

@PL413r
@Ned

Ned YOU SAID: Also some of the choices in the multiple choice questions are not in the icnd1 material 101 or the 105 e.g private vlan, span ports hrsp..

IS WHAT I FOUND ABOUT:
Cisco SPAN port is a SwitchPort ANalyzer on the cisco catalyst that allows to select and span or copy traffic from one or more source switchports or source VLANs onto one or more destination ports.
https://supportforums.cisco.com/document/139236/understanding-spanrspanand-erspan

There are 3 types of span!!!
https://supportforums.cisco.com/document/139236/understanding-spanrspanand-erspan#Types_of_SPAN: