CCNA – IP Routing Questions 2

will u please give me explanation about q:-9?
thanks

@sukhjit:Q9–>it is based on Administrative Distance value..bcoz the AD value for directly connected interfaces is 0..The AD value for EIGRP=90
OSPF =110
STATIC=1
so obviously the ans is D(directly connected interfaces)
hope this explanation is enough for u

# 9

HQ(config)# ip route 192.168.1.0 255.255.255.0 192.168.2.5
Branch(config) # ip route 172.16.25.0 255.255.255.0 192.168.2.6
I think # 9 answer needs a little modification :
HQ(config) # ip route 192.168.1.0 255.255.255.0 192.168.2.6——-> ip add of the receiving interface of next-hop router = 192.168.2.6
Branch(config)# ip route 192.168.2.0 255.255.255.0 192.168.2.5——–> ip add. of the receiving interface of next-hop router = 192.168.2.5
I would be glad to receive a feedback.
resolved

@resolved: Maybe you want to refer to Question 7. Please notice that if we are on HQ router we need to use the Branch IP address as the next-hop router so the commands
HQ(config)# ip route 192.168.1.0 255.255.255.0 192.168.2.5
Branch(config) # ip route 172.16.25.0 255.255.255.0 192.168.2.6
are correct.
Notice that 192.168.2.5 is Branch’s IP, 192.168.2.6 is HQ’s IP.

mystical
pls i will write ccna exam this month if there is any new qustn tha is not in 9tut feeds ie for those that wrt this nov

Please modify Q 10 not parameter that can be tuned … parameter affect is enough to get the meaning of the question it make me little confused .

Thanks 9tut gr8 useful questions

PLS SOMEBODY GIVE EXPLANATION FOR Q:8

@ranjita

A. a dynamic routing protocol on InternetRouter to advertise summarized routers to CentralRouter.
nope, the internet router doesn’t have to advertise anything

B. a dynamic routing protocol on CentralRouter to advertise summarized routers to InternetRouter.
just set a default route. i wouldn’t go for this one

C. a static route on InternetRouter to direct traffic that is destined for 172.16.0.0/16 to CentralRouter.
using static routes is the easiest way. “ip route 172.16.0.0 255.255.0.0 INTERFACE_TO_CENTRALROUTER”
the central router would have to figure out where to send it all then.

D. a dynamic routing protocol on InternetRouter to advertise all routes to CentralRouer.
internet router shouldn’t advertise anything. it could redistribute its default network.

E. a dynamic routing protocol on CentralRouer to advertise all routes to InternetRouter
it has just 1 network to advertise: 172.16.0.0/16. why bother use a routing protocol?

F. a static, default route on CentralRouter that directs traffic to InternetRouter.
this is the default network that’s needed to get everything from the LAN out on the internet: “ip route 0.0.0.0 0.0.0.0 INTERFACE_TO_INTERNETROUTER”

hope this helps, cheers

anybody can expalain q8 please??????

@riyas
have you read my post just above yours?

@riyas

When you use a dynamic routing protocol, the protocol generates routing updates each time, (the update time interval depends on the routing protocol that you use), by this the routing protocol needs much bandwidth utilization. Otherwise if you use static or default route you don’t need routing information passing each time through the link all the time. And the question say? (easy configuration options and minimal routing protocol traffic).

I hope that this help you.

For number 5 I know that RIPv2 dynamic broadcasts do not work in frame-relay environment… so why isn’t the answer also “b”?

lol nvm I just answered my own question haha

please can someone explain me Q9 pl pl????

@bakki

Q9, have a read over administrative distances.
Directly connected routing source has an AD of 0.
Static is 1, EIGRP is 90, OSPF is 110 and RIP is 120.
The lower the AD, the more trusted/reliable the source and is inserted into the routing table.

Hope that helps.

@9tut
on Q13
replace line “D. ip route 0.0.0.00.0:0:0 172.16.100.1″
with “D. ip route 0.0.0.0 0.0.0.0 172.16.100.1″

thank you

Question 12

Which two are advantages of static routing when compared to dynamic routing? (choose two)

A. Security increases because only the network administrator may change the routing tables.
B. Configuration complexity decreases as network size increases.
C. Routing updates are automatically sent to neighbors.
D. Route summarization is computed automatically by the router.
E. Routing traffic load is reduced when used in stub network links.
F. An efficient algorithm is used to build routing tables using automatic updates.
G. Routing tables adapt automatically to topology changes.

the same question answer is B & G in dumps..
can anyone tell which in right?

@pradeep

A. Security increases because only the network administrator may change the routing tables.
the admin was in charge of the network anyway…
still, think of the scenario when someone connected a test router to the network and started advertising rip/eigrp/ospf routes and then the rest of the network would start acting weird.
static routes are a good for security. true

B. Configuration complexity decreases as network size increases.
false. the admin has to add in all the entry lines on each and every device…

C. Routing updates are automatically sent to neighbors.
false. static routes don’t share a thing

D. Route summarization is computed automatically by the router.
it uses the classful network in the routing table… true

E. Routing traffic load is reduced when used in stub network links.
a stub network has only one entry/exit point. routing updates dont hog the network all that much so i wouldnt agree on this on

F. An efficient algorithm is used to build routing tables using automatic updates.
there’s no algorithm used, the admin decides which routes to add in.

G. Routing tables adapt automatically to topology changes.
same thing as F. there’s nothing automated regarding static routes

my answers are A and D

Can someone please explain Q10
As I understood it the static route will be elected as a backup because it has lower administrative distance than any dynamic routing protocol.
The part of the question ‘can be tuned’ is a little confusing for me

@maja: By default, the static route has lower administrative distance (AD) so it is preferred over other dynamic routing protocol. Therefore we have to increase the AD of the static route (to a higher value than the dynamic routing protocol) so that the dynamic routing protocol becomes main route.

@9tut
thanks a lot! now I understand the question! if we don’t increase the AD, static route will be used instead of dynamic. That’s the problem with us non native speakers :)

@xallax and @9tut

Question 12

Which two are advantages of static routing when compared to dynamic routing? (choose two)

A. Security increases because only the network administrator may change the routing tables. This is correct, because you manually configure them.
B. Configuration complexity decreases as network size increases. Wrong, you have to configure more.
C. Routing updates are automatically sent to neighbors. Wrong.
D. Route summarization is computed automatically by the router. Wrong since it’s a routing protocol that auto sums? xallax has this as a correct answer.
E. Routing traffic load is reduced when used in stub network links. 9tut has this as a correct answer, but I don’t understand why.
F. An efficient algorithm is used to build routing tables using automatic updates. wrong
G. Routing tables adapt automatically to topology changes. no, because it is configured static. you would have to manually change it.

May I get a confirmation of which answer is correct between D & E, please.

@domi
i stand my ground: A and D :)

at xallax

answers are A and E

stub areas are used in multi area OSPF. OSPF eats up the most processor of all routing protocols. static routes eliminate processing usage.

D cannot be correct because OSPF does not use have auto sum by default, EIGRP and Ripv2 do have it on my default

@eddie
come to think of it… if that static route is actually a default route then E is correct…
and you’re right on “stub area” being only for ospf. i didn’t think of the processor usage.
A and E are correct after all, thank you eddie

Q13 ,

If R2 interface IP are not known , can we use option D?

@irfan
nope. to configure a static route you use:
- the name of the local exit interface (i.e.: interface fa0/1)
- the IP of the remote destination interface (on this scenario: 172.16.100.2)

if you used 172.16.100.1 then you had a loop in the routing process and all traffic came back to the router endlessly

can someone please explain for me about the answer C of question 11.
thanks so much

you can read this kinrock oreilly.com/catalog/iprouting/chapter/ch04.html

Hi 9tut… Hi Guys! Can you please help me… I will take exam this Feb. Please send me latest dump so that I will have an idea for the exam.. rico.blake@ymail.com

Thanks Guys!

Am i the only one who thinks the 4th answer is a smiley?

http://postimage.org/image/6imx0zagb/

Why is the answer not also E? Shouldn’t the MAC address be the same for all ports in a router? Shouldn’t the Answer be A,E, and F eventhough question said choose two? If not is there any preference like UDP port is used is the prefered over TCP is used for DNS when you are only given one choice? Please explain.

Q. 13

Serial link… E1 speed is 2.048 Mbps.
Other link… 100 Mbps.
Thats why the root was towards Router R2. is not it?

Q.1
9tut Yesterday they brought Q.1 but with a MUCH MUCH difficult way, it was as follows:
What are the source and destination mac addresses of the frame received by the router and the source and destination mac addresses of the frame that will be sent by the router?

I think the answer in the above case’ll be:

1- Received packet:
source mac: 0000.0c07.f892
destination mac: 0000.0c07.ae45
2- Sent packet:
source mac: 0000.0c63.6965
destination mac: 0000.0c07.4320

Please checkup :)

@Migdad: Yes, your answer is correct!

thanks 9tut

@ Migdad Thank you so much for the new question.

Q8.
I don’t understand, why InternetRouter should advertise route for PRIVATE network in INTERNET

I understood, thanks… if there PAT installed, it should forward to CentralRouter

Q12.
The answer is right as it is.
Based on the following explanations from Sybex

1.There is no overhead on the router CPU, which means you could possibly buy a cheaper
router than you would use if you were using dynamic routing.

 2.There is no bandwidth usage between routers, which means you could possibly save
money on WAN links.

3.It adds security because the administrator can choose to allow routing access to certain
networks only.

@Aidos

Q8.

I have three words for you point-to-point….P2P…..A point-to-point link requires a static route, which happens to be the most reliable route.

Option C would allow InternetRouter to direct traffic that is destined for 172.16.0.0/16 to CentralCouter VIA a static route. And option F is vise-versa to option C…….default static route.

Who knows the new questions?

@xallax

In this question how was it determined Branch Router 1 is only able to send Ripv1 updates? I thought Ripv1 can only use classful masks but in this question clearly the lans connected to Branch Router 1 have classless masks (/27).

http://s17.postimage.org/t0qf5p4pb/IP_routing_Rip.jpg

@raj
simple, it advertised a classfull network even though it had only 2 small subnets on it. ripv2 doesnt do that (if you use “no auto-summary”).
another clue is the address of the device that advertised it which is the one of branch-router1

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@@ Sukhjit
please conside AD for the answer
Directly connected intterface–> AD 0
Static route–> AD 1
the router will always keep the route with minimum AD..