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NEW QUESTION: 1
When ospf is forming an adjacency, in which state does the actual exchange of information in the link-state database occur?
A. Loading
B. Exstart
C. INIT
D. Exchange
Answer: A
Explanation:
Explanation/Reference:
Explanation:
Down
This is the first OSPF neighbor state. It means that no information (hellos) has been received from this neighbor, but hello packets can still be sent to the neighbor in this state.
During the fully adjacent neighbor state, if a router doesn't receive hello packet from a neighbor within the RouterDeadInterval time (RouterDeadInterval = 4*HelloInterval by default) or if the manually configured neighbor is being removed from the configuration, then the neighbor state changes from Full to Down.
Attempt
This state is only valid for manually configured neighbors in an NBMA environment. In Attempt state, the router sends unicast hello packets every poll interval to the neighbor, from which hellos have not been received within the dead interval.
Init
This state specifies that the router has received a hello packet from its neighbor, but the receiving router's ID was not included in the hello packet. When a router receives a hello packet from a neighbor, it should list the sender's router ID in its hello packet as an acknowledgment that it received a valid hello packet.
2-Way
This state designates that bi-directional communication has been established between two routers. Bi- directional means that each router has seen the other's hello packet. This state is attained when the router receiving the hello packet sees its own Router ID within the received hello packet's neighbor field. At this state, a router decides whether to become adjacent with this neighbor. On broadcast media and non- broadcast multiaccess networks, a router becomes full only with the designated router (DR) and the backup designated router (BDR); it stays in the 2-way state with all other neighbors. On Point-to-point and Point-to-multipoint networks, a router becomes full with all connected routers.
At the end of this stage, the DR and BDR for broadcast and non-broadcast multi-acess networks are elected. For more information on the DR election process, refer to DR Election.
Note: Receiving a Database Descriptor (DBD) packet from a neighbor in the init state will also a cause a transition to 2-way state.
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.
Exchange
In the exchange state, OSPF routers exchange database descriptor (DBD) packets. Database descriptors contain link-state advertisement (LSA) headers only and describe the contents of the entire link-state database. Each DBD packet has a sequence number which can be incremented only by master which is explicitly acknowledged by slave. Routers also send link-state request packets and link-state update packets (which contain the entire LSA) in this state. The contents of the DBD received are compared to the information contained in the routers link-state database to check if new or more current link-state information is available with the neighbor.
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.
Full
In this state, routers are fully adjacent with each other. All the router and network LSAs are exchanged and the routers' databases are fully synchronized.
Full is the normal state for an OSPF router. If a router is stuck in another state, it is an indication that there are problems in forming adjacencies. The only exception to this is the 2-way state, which is normal in a broadcast network. Routers achieve the FULL state with their DR and BDR in NBMA/broadcast media and FULL state with every neighbor in the remaining media such as point-to-point and point-to-multipoint.
Note: The DR and BDR that achieve FULL state with every router on the segment will display FULL/ DROTHER when you enter the show ip ospf neighbor command on either a DR or BDR. This simply means that the neighbor is not a DR or BDR, but since the router on which the command was entered is either a DR or BDR, this shows the neighbor as FULL/DROTHER.

NEW QUESTION: 2
When upgrading from the old version to the V200R006 version, the old configuration file cannot be used directly. You need to use the configuration file conversion tool to convert the old configuration file to the configuration file of V200R006 version. Which of the following versions should be upgraded to V200R006C10? Convert the old configuration file to the V200R006C10 version of the configuration file?
A. V200R005C10
B. V200R005C00
C. V200R006C00
D. V200R003C00
Answer: A,B,D

NEW QUESTION: 3
CORRECT TEXT - (Topic 4)
A corporation wants to add security to its network. The requirements are:
*
Host B should be able to use a web browser (HTTP) to access the Finance Web
Server.
*
Other types of access from host B to the Finance Web Server should be blocked.
*
All access from hosts in the Core or local LAN to the Finance Web Server should be blocked.
*
All hosts in the Core and on local LAN should be able to access the Public Web
Server.
You have been tasked to create and apply a numbered access list to a single outbound interface. This access list can contain no more than three statements that meet these requirements.
Access to the router CLI can be gained by clicking on the appropriate host.
*
All passwords have been temporarily set to "cisco".
*
The Core connection uses an IP address of 198.18.132.65.
*
The computers in the Hosts LAN have been assigned addresses of 192.168.201.1
- 192.168.201.254.
*
host A 192.168.201.1
*
host B 192.168.201.2
*
host C 192.168.201.3
*
host D 192.168.201.4
*
The Finance Web Server has been assigned an address of 172.22.237.17.
*
The Public Web Server in the Server LAN has been assigned an address of
172.22.237.18.








Answer:
Explanation:
Please check the below explanation for all details.
Explanation:
We should create an access-list and apply it to the interface that is connected to the Server
LAN because it can filter out traffic from both S2 and Core networks. To see which interface this is, use the "show ip interface brief" command:

From this, we know that the servers are located on the fa0/1 interface, so we will place our numbered access list here in the outbound direction.
Corp1#configure terminal
Our access-list needs to allow host B - 192.168125.2 to the Finance Web Server
172.22.109.17 via HTTP (port 80), so our first line is this:
Corp1(config)#access-list 100 permit tcp host 192.168.125.2 host 172.22.109.17 eq 80
Then, our next two instructions are these:
*
Other types of access from host B to the Finance Web Server should be blocked.
*
All access from hosts in the Core or local LAN to the Finance Web Server should be blocked.
This can be accomplished with one command (which we need to do as our ACL needs to be no more than 3 lines long), blocking all other access to the finance web server:
Corp1(config)#access-list 100 deny ip any host 172.22.109.17
Our last instruction is to allow all hosts in the Core and on the local LAN access to the
Public Web Server (172.22.109.18)
Corp1(config)#access-list 100 permit ip host 172.22.109.18 any
Finally, apply this access-list to Fa0/1 interface (outbound direction)
Corp1(config)#interface fa0/1
Corp1(config-if)#ip access-group 100 out
Notice: We have to apply the access-list to Fa0/1 interface (not Fa0/0 interface) so that the access-list can filter traffic coming from both the LAN and the Core networks.
To verify, just click on host B to open its web browser. In the address box type
http://172.22.109.17 to check if you are allowed to access Finance Web Server or not. If your configuration is correct then you can access it.
Click on other hosts (A, C and D) and check to make sure you can't access Finance Web
Server from these hosts. Then, repeat to make sure they can reach the public server at
172.22.109.18. Finally, save the configuration
Corp1(config-if)#end
Corp1#copy running-config startup-config