OSPF Questions 2

Hi!

Can you please confirm the answer to question 1, i think its B (Loading)

https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13685-13.html

Loading

In this state, the actual exchange of link state information occurs. Based on the information provided by the DBDs, routers send link-state request packets. The neighbor then provides the requested link-state information in link-state update packets.

Question 3

Refer to the exhibit. A network engineer executes the show ipv6 ospf database command and is presented with the output that is shown. Which flooding scope is referenced in the link-state type?
(Exhibit missing)

A. link-local
B. area
C. AS (OSPF domain)
D. reserved

The exibit is showing:

Link (Type-8) Link states (Area 0)

As its type 8 shouldn’t it be the link-local flooding scope ?

Refer to the exhibit. A network engineer executes the show ipv6 ospf database command and is presented with the output that is shown. Which flooding scope is referenced in the link-state type?
(Exhibit missing)

A. link-local
B. area
C. AS (OSPF domain)
D. reserved

Whats the correct answer?

When OSPF is forming an adjacency, in which state, the actual exchange of information in the link?
A. INIT
B. loading
C. exstart
D. exchange

Whats the answer?

Exstart

Once the DR and BDR are elected, the actual process of exchanging link state information can start between the routers and their DR and BDR.
In this state, the routers and their DR and BDR establish a master-slave relationship and choose the initial sequence number for adjacency formation. The router with the higher router ID becomes the master and starts the exchange, and as such, is the only router that can increment the sequence number. Note that one would logically conclude that the DR/BDR with the highest router ID will become the master during this process of master-slave relation. Remember that the DR/BDR election might be purely by virtue of a higher priority configured on the router instead of highest router ID. Thus, it is possible that a DR plays the role of slave. And also note that master/slave election is on a per-neighbor basis.

Loading

In this state, the actual exchange of link state information occurs. Based on the information provided by the DBDs, routers send link-state request packets. The neighbor then provides the requested link-state information in link-state update packets. During the adjacency, if a router receives an outdated or missing LSA, it requests that LSA by sending a link-state request packet. All link-state update packets are acknowledged.

Hello anu,

Please , it will be helpful to share the dumps. I don’t find the questions.

my e mail is loofy666 @ gmail . com

I download from this site Route_April_2016 but the questions don’t correspond .

Please help me

Passed today 9xx,
Study the labs from here and check out for the latest dumps on IT-Libraries website there are a lot of users that use it and you can see if the dumps are still valid or not.

good luck

@Anu @Sq

Question3:

It must be link local

Failed today with 760pts….although I cleared all my labs , loads of new questions ,don’t trust any dumps…study hard chaps….and loads of simlet ( IPV6 , ACL, NAT, NAT-PT ETC ETC )

IT Libraries hasn’t got all questions ..

ACL very important ( IPV6 and IPV4 both)

I was using my old 642-902 books :(, please get the new cert guide for CCNP route 300-101)

Hello guys, for latest valid dump with continuous update, please contact me at steffyshirls @ gmail .com

When OSPF is forming an adjacency, in which state, the actual exchange of information in the link?
A. INIT
B. loading
C. exstart
D. exchange
Whats the answer?
Exstart
Once the DR and BDR are elected, the actual process of exchanging link state information can start between the routers and their DR and BDR.
In this state, the routers and their DR and BDR establish a master-slave relationship and choose the initial sequence number for adjacency formation. The router with the higher router ID becomes the master and starts the exchange, and as such, is the only router that can increment the sequence number. Note that one would logically conclude that the DR/BDR with the highest router ID will become the master during this process of master-slave relation. Remember that the DR/BDR election might be purely by virtue of a higher priority configured on the router instead of highest router ID. Thus, it is possible that a DR plays the role of slave. And also note that master/slave election is on a per-neighbor basis.
Loading
In this state, the actual exchange of link state information occurs. Based on the information provided by the DBDs, routers send link-state request packets. The neighbor then provides the requested link-state information in link-state update packets. During the adjacency, if a router receives an outdated or missing LSA, it requests that LSA by sending a link-state request packet. All link-state update packets are acknowledged.
Pif August 19th, 2017
Hello anu,

Question 1

When OSPF is forming an adjacency, in which state, the actual exchange of information in the link?
A. INIT
B. loading
C. exstart
D. exchange

B. Loading is the correct answer.

Question 1

I believe based on information from link below it should be C: EXSTART

When OSPF is forming an adjacency, in which state, the actual exchange of information in the link?
A. INIT
B. loading
C. exstart
D. exchange

https://www.computernetworkingnotes.com/ccna-study-guide/ospf-neighbor-states-explained-with-example.html

Hi folks,

Can I get clarification on Q1?

I am uncertain about how it is worded. Is at asking about routing information or link state information?

Database sequence numbers and master/ slave logic negotiated = exstart state
Routing information exchanged = loading state

The answer would depend on the interpretation of the question?

Q1. Answer is loading.

exstart = forming master/slave relationship
exchange = exchange Database Descriptors (LSA headers only)
loading = exchange of full LSA (the ones the router doesnt have already)

Q4
area range
https://www.cisco.com/c/m/en_us/techdoc/dc/reference/cli/nxos/commands/ospf/area-range-ospf.html

summary address
https://www.cisco.com/c/m/en_us/techdoc/dc/reference/cli/nxos/commands/ospf/summary-address-ospf.html

Q4 is vague, it says “exchange of information” not exchange of LSA’s. DBD’s are information so for me the answer is D ‘Exchange’.

Sorry meant Q1 in above post.

Q1 is confusing due to wording.
Exstart is mistakenly listed due to similar wording being “the actual process of exchanging link state information can start”.
The Correct answer must be Loading… this is highlighted in the document that is referenced..
” Loading – In this state, the actual exchange of link state information occurs.”

Q2 is :
Intra-Area (O)
Inter-Area (O IA)
External Type 1 (E1)
NSSA Type 1 (N1)
External Type 2 (E2)
NSSA Type 2 (N2)

This can be proved by having one of each network type using the same IP address on different routers all connecting to one hub and slowly removing each from top to bottom.

For Q1 , from my little understanding I think the answer is (loading)
Because
Exstart: is the actual (process) of exchanging link state information can (start) not the exchange it self
Loading: is the actual exchange of link state information occurs.
So the exchange it self happens in loading not Exstart.

For CISCO exam… what is the correct answer for Q1? I fail on test just for one question and this questions show in my test… please.. help me

Folks, Question 1 is Exstart
https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13685-13.html

Q3, about “flooding scope”. Answer is A (link-local), NOT B.

“Link LSAs (Type 8)—Have local-link flooding scope and are never flooded beyond the link with which they are associated.”

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-mt/iro-15-mt-book/ip6-route-ospfv3.html

“Type 8 LSAs only exist on a local link” (Official Cert Guide).

some old ospf questions from this site https://www.digitaltut.com/ospf-questions-2

Can anybody clarify on the answer for Q9?
A route map was configured and it was distributing OSPF external routes.

A. Distributing E1 only
B. Distributing E1 and E2 using prefix list
C. Distributing E1 and E2 using access list
D. Distributing E2 routes

@CCNP_Learner
I think both B and C are correct, but if you consider that ACLs are used for many things; And Prefix-Lists are JUST used to matching Routes, then you can say that B is more correct,,

Q1 answer is Exstart the question is “Starts Exchanging INFORMATION in the Link” so electing of Master and Slave is the first exchange of information through comparing each router ID. That’s the first information being shared to each router thus Exstart is the answer.

For Q3 we need to know that missing exhibit the answer could be Area/Intra-Area if LSA Type 9 or Link-Local if LSA Type 8.

Q1 there is a lot of debate. It is all in the wording. The Question asks:
“in which state, the actual exchange of information in the link”
note “Actual Exchange”

Cisco state in their OSPF Neighbor States Dohttps://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13685-13.html

Loading
In this state, the actual exchange of link state information occurs

Therefore the answer should be B

ExStart is just setting up for the exchange
Loading is just loading the DBD’s not the full info

I cant see the questions.
i see answers only. is that for all?

Since Cisco IOS release 15.1(2)S, Cisco uses the path selection order from RFC 3101 which obsoletes RFC 1587. What this means is that it prefers N1 routes before E1 and N2 over E2 routes. In other words, the prefered path list is O > O IA > N1 > E1 > N2 > E2.

Real and effective, can be used as a reference, very effective, I hope to help you.
W w

w.cc iedumps.xyz/ccie_rs.php?ut m_source=bbs&utm_medium=bbs

Q2:

Answer is: B A C E D F

This is a good site to understand it…
https://networklessons.com/ospf/ospf-path-selection-explained/

Q2 again… sorry, bad order… here is the good:

B Intra-Area (O)
A Inter-Area (O IA)
E External Type 1 (E1)
C NSSA Type 1 (N1)
D External Type 2 (E2)
F NSSA Type 2 (N2)

Hate this… I cant edit and now I have 2 bad order above this…

Q2:

OSPF chooses routes in which order, regardless of route’s adminstrative distance and metric?
A. Interarea
B. Intra-area
C. NSSA type1
D. NSSA type 2
E. External type1
F. External type2

B A E C F D !!!

@Camp
You’re wrong. Most sites say different:

https://blog.ine.com/2011/04/04/understanding-ospf-external-route-path-selection

https://vceguide.com/which-order-regardless-of-routes-administrative-distance-and-metric/

@kaktus
RFC2328 says:”Compare the AS external path described by the LSA with the existing paths in N’s routing table entry, as follows. If the new path is preferred, it replaces the present paths in
N’s routing table entry. If the new path is of equal preference, it is added to N’s routing table entry’s list of paths.
(a) Intra-area and inter-area paths are always preferred over AS external paths.
(b) Type 1 external paths are always preferred over type 2 external paths. When all paths are type 2 external paths, the paths with the smallest advertised type 2 metric are always preferred.”

Intra-Inter-Ext 1-NSSA 1-Ext 2-NSSA2

I agree with RouterRider for formula 0 > O IA > E1 > N1 > E2 > N2. This is according with IOS 15. What is written in ine blog page was a rule applied to IOS 12.x

Q1, Answer B:
In this state, the actual exchange of link state information occurs.

Q1 agree with Jose

First sentence is the explanation on the link provided below the question says exactly that:

Loading
In this state, the actual exchange of link state information occurs.

Correct Answer: ABECFD.
https://forum.networklessons.com/t/ospf-path-selection-explained/969/29

OSPF doesn’t make a difference between inter-area or intra-area external routes. It doesn’t matter where the external route originated, it’s the cost that makes the difference.

When I booted up this lab again, I did find something interesting. When I wrote this lesson, I used IOS 12.4 and this is the list that OSPF uses for path selection:

Intra-Area (O)
Inter-Area (O IA)
External Type 1 (E1)
NSSA Type 1 (N1)
External Type 2 (E2)
NSSA Type 2 (N2)
Since Cisco IOS release 15.1(2)S, Cisco uses the path selection order from RFC 3101 which obsoletes RFC 1587. What this means is that it prefers N1 routes before E1 and N2 over E2 routes. In other words, the preferred path now is:

Intra-Area (O)
Inter-Area (O IA)
NSSA Type 1 (N1)
External Type 1 (E1)
NSSA Type 2 (N2)
External Type 2 (E2)
So if you have an N1 route and an E1 route, it doesn’t matter where those originated…OSPF will prefer the N1 route (if you run at least IOS 5.1(2)S :grin:

Hope this helps!

Rene

Hello guys, Digitaltut , just wanted to point here some mismatch between two of the questions here and the Composite questions. Here under OSPF 3 questions, we have the following question:
When OSPF is forming an adjacency, in which state, the actual exchange of information in the link? —> Loading

On the composite questions absolutely the same question has an answer “Exstart”.

* Basically as per my understanding the Exstart is the moment when two neighbors negotiate the DR/BDR states and master-slave info.
* During the Loading state the two neighbors are already exchanging information provided by the DBD’s and just exchange some LSR and LSU messages based on the information in the DBD and depending if it’s outdated from their perspective.

So, according to that it seems that during Exstart the adjacency is formed, and during the Loading the adjacency is already formed and the DBD info is exchanged. So, I suppose the Exchange should be the correct answer in both.

@ANANSWERABOUTMISMATCHEDQUESTION
@Everyone

In summary, my penny’s worth –

INIT – Hello Packet sent, nothing yet received from neighbor. Not yet 2 Way.
2Way – Hello packet received back from neighbor. Sending router can see it’s own router ID.
Exstart – Master / Slave Election
Exchange – Exchange of DBD’s between routers (A summary of which routes each of the routers have in their databases.
Loading – ‘Actual’ Exchange of routes not known between both routers so that their DB’s match.
Full – Databases ‘Full’ on both routers.

@Everyone

Which OSPF patch selection should be used for the exam?
Depending on the IOS version it has 2 correct answers.

Q7 Answer should be B. Link Local Addresses

Here is from the “new-route-questions-part-5”

Question 44

What type of address OSPFv3 uses to form adjacency and send updates?

A. FF02::5
B. link-local
C. IPv4 address
D. IPv6 address multicast

Answer: B

can someone please share the dumps of 2019?
my e mail is the_edwinhank @ hotmail com

As CCNP_learner, I do not see the whole scenary to choose in Q9 option B. Does anybody know why it is the chosen option? A route map could differentiate E1 and E2 based on different criteria, possibly access list and prefix list, couldn’t it?