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2021 Dec cisco ccnp route 300-101 book:
Q51. Which protocol uses dynamic address mapping to request the next-hop protocol address for a specific connection?
A. Frame Relay inverse ARP
B. static DLCI mapping
C. Frame Relay broadcast queue
D. dynamic DLCI mapping
Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a
specific connection, given its known DLCI. Responses to
Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server; the
table is then used to supply the next-hop protocol
address or the DLCI for outgoing traffic.
Q52. Which technology was originally developed for routers to handle fragmentation in the path between end points?
E. global synchronization
Q53. CORRECT TEXT [SIMULATION]
Route.com is a small IT corporation that is attempting to implement the network shown in the exhibit. Currently the implementation is partially completed. OSPF has been configured on routers Chicago and NewYork. The SO/O interface on Chicago and the SO/1 interface on NewYork are in Area 0. The loopbackO interface on NewYork is in Area 1. However, they cannot ping from the serial interface of the Seattle router to the loopback interface of the NewYork router. You have been asked to complete the implementation to allow this ping.
ROUTE.com's corporate implementation guidelines require:
. The OSPF process ID for all routers must be 10.
. The routing protocol for each interface must be enabled under the routing process.
. The routing protocol must be enabled for each interface using the most specific wildcard mask possible.
.The serial link between Seattle and Chicago must be in OSPF area 21.
.OSPF area 21 must not receive any inter-area or external routes.
S0/0 192.168.16.5/30 - Link between Seattle and Chicago
Secret Password: cisco
S0/0 192.168.54.9/30 - Link between Chicago and NewYork
S0/1 192.168.16.6/30 - Link between Seattle and Chicago Secre Password: cisco
S0/1 192.168.54.10/30 - Link between Chicago and NewYork
Secret Password: cisco
Answer: Here is the solution below:
Note: In actual exam, the IP addressing, OSPF areas and process ID, and router hostnames may change, but the overall solution is the same.
Seattle’s S0/0 IP Address is 192.168.16.5/30. So, we need to find the network address and wildcard mask of 192.168.16.5/30 in order to configure the OSPF.
IP Address: 192.168.16.5 /30
Subnet Mask: 255.255.255.252
Here subtract 252 from 2565, 256-252 = 4, hence the subnets will increment by 4.
First, find the 4th octet of the Network Address:
The 4th octet of IP address (192.168.16.5) belongs to subnet 1 (4 to 7).
Network Address: 192.168.16.4
Broadcast Address: 192.168.16.7
Lets find the wildcard mask of /30.
Subnet Mask: (Network Bits – 1’s, Host Bits – 0’s)
Lets find the wildcard mask of /30:
Now we configure OSPF using process ID 10 (note the process ID may change to something else in real exam).
Seattle(config)#router ospf 10
Seattle(config-router)#network 192.168.16.4 0.0.0.3 area 21
One of the tasks states that area 21 should not receive any external or inter-area routes (except
the default route).
Seattle(config-router)#area 21 stub
Seattle#copy run start
Chicago(config)#router ospf 10
We need to add Chicago’s S0/1 interface to Area 21
Chicago(config-router)#network 192.168.16.4 0.0.0.3 area 21
Again, area 21 should not receive any external or inter-area routes (except the default route).
In order to accomplish this, we must stop LSA Type 5 if we don’t want to send external routes. And
if we don’t want to send inter-area routes, we have to stop LSA Type 3 and Type 4. Therefore we
want to configure area 21 as a totally stubby area.
Chicago(config-router)#area 21 stub no-summary
Chicago#copy run start
The other interface on the Chicago router is already configured correctly in this scenario, as well
as the New York router so there is nothing that needs to be done on that router.
Q54. A network engineer is investigating the cause of a service disruption on a network segment and executes the debug condition interface fastethernet f0/0 command. In which situation is the debugging output generated?
A. when packets on the interface are received and the interface is operational
B. when packets on the interface are received and logging buffered is enabled
C. when packets on the interface are received and forwarded to a configured syslog server
D. when packets on the interface are received and the interface is shut down
Q55. CORRECT TEXT
JS Industries has expanded their business with the addition of their first remote office. The remote office router (R3) was previously configured and all corporate subnets were reachable from R3. JS Industries is interested in using route summarization along with the EIGRP Stub Routing feature to increase network stability while reducing the memory usage and bandwidth utilization to R3. Another network professional was tasked with implementing this solution. However, in the process of configuring EIGRP stub routing connectivity with the remote network devices off of R3 has been lost.
Currently EIGRP is configured on all routers R2, R3, and R4 in the network. Your task is to identify and resolve the cause of connectivity failure with the remote office router R3. Once the issue has been resolved you should complete the task by configuring route summarization only to the remote office router R3.
You have corrected the fault when pings from R2 to the R3 LAN interface are successful, and the R3 IP routing table only contains 2 10.0.0.0 subnets.
Answer: Here are the solution as below:
First we have to figure out why R3 and R4 can not communicate with each other. Use the show running-config command on router R3.
Notice that R3 is configured as a stub receive-only router. The receive-only keyword will restrict the router from sharing any of its routes with any other router in that EIGRP autonomous system. This keyword will also prevent any type of route from being sent. Therefore we will remove this command and replace it with the eigrp stub command:
R3# configure terminal
R3(config)# router eigrp 123
R3(config-router)# no eigrp stub receive-only
R3(config-router)# eigrp stub
Now R3 will send updates containing its connected and summary routes to other routers. Notice that the eigrp stub command equals to the eigrp stub connected summary because the connected and summary options are enabled by default. Next we will configure router R3 so that it has only 2 subnets of 10.0.0.0 network. Use the show ip route command on R3 to view its routing table:
Because we want the routing table of R3 only have 2 subnets so we have to summary sub-networks at the interface which is connected with R3, the s0/0 interface of R4.
There is one interesting thing about the output of the show ip route shown above: the 10.2.3.0/24, which is a directly connected network of R3. We can’t get rid of it in the routing table no matter what technique we use to summary the networks. Therefore, to make the routing table of R3 has only 2 subnets we have to summary other subnets into one subnet.
In the output if we don’t see the summary line (like 10.0.0.0/8 is a summary…) then we should use the command ip summary-address eigrp 123 10.2.0.0 255.255.0.0 so that all the ping can work well.
In conclusion, we will use the ip summary-address eigrp 123 10.2.0.0 255.255.0.0 at the interface s0/0 of R4 to summary.
R4# conf t
R4(config)# interface s0/0
R4(config-if)# ip summary-address eigrp 123 10.2.0.0 255.255.0.0
Now we jump back to R3 and use the show ip route command to verify the effect, the output is shown below:
Note: Please notice that the IP addresses and the subnet masks in your real exam might be different so you might use different ones to solve this question. Just for your information, notice that if you use another network than 10.0.0.0/8 to summary, for example, if you use the command ip summary-address eigrp 123 10.2.0.0 255.255.0.0 you will leave a /16 network in the output of the show ip route command.
But in your real exam, if you don’t see the line "10.0.0.0/8 is a summary, Null0" then you can summarize using the network 10.2.0.0/16. This summarization is better because all the pings can work well. Finally don’t forget to use the copy run start command on routers R3 and R4 to save the configurations. R3(config-if)# end R3# copy run start R4(config-if)# end R4# copy run start
If the “copy run start” command doesn’t work then use “write memory.”
Most up-to-date eclipse 300-101:
Q56. Refer to the exhibit. The DHCP client is unable to receive a DHCP address from the DHCP server. Consider the following output:
hostname RouterB ! interface fastethernet 0/0
ip address 172.31.1.1 255.255.255.0 interface serial 0/0 ip address 10.1.1.1 255.255.255.252
! ip route 172.16.1.0 255.255.255.0 10.1.1.2
Which configuration is required on the Router B fastethernet 0/0 port in order to allow the DHCP client to successfully receive an IP address from the DHCP server?
A. RouterB(config-if)# ip helper-address 172.16.1.2
B. RouterB(config-if)# ip helper-address 172.16.1.1
C. RouterB(config-if)# ip helper-address 172.31.1.1
D. RouterB(config-if)# ip helper-address 255.255.255.255
Q57. A network engineer executes the “ipv6 flowset” command. What is the result?
A. Flow-label marking in 1280-byte or larger packets is enabled.
B. Flow-set marking in 1280-byte or larger packets is enabled.
C. IPv6 PMTU is enabled on the router.
D. IPv6 flow control is enabled on the router.
Enabling Flow-Label Marking in Packets that Originate from the Device This feature allows the device to
track destinations to which the device has sent packets that
are 1280 bytes or larger.
5.clear ipv6 mtu
Command or Action Purpose
Step 1 enable Enables privileged EXEC mode.
Enter your password if prompted.
Step 2 configure terminal Enters global configuration mode.
Step 3 ipv6 flowset Configures flow-label marking in 1280-byte or larger packets sent by the device.
Step 3 ipv6 flowset Configures flow-label marking in 1280-byte or larger packets sent by the device.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/15- mt/ip6b-15-mtbook/ip6-mtu-path-disc.html
You have been asked to evaluate an OSPF network setup in a test lab and to answer questions a customer has about its operation. The customer has disabled your access to the show running-config command.
How old is the Type 4 LSA from Router 3 for area 1 on the router R5 based on the output you have examined?
Q59. Under which condition does UDP dominance occur?
A. when TCP traffic is in the same class as UDP
B. when UDP flows are assigned a lower priority queue
C. when WRED is enabled
D. when ACLs are in place to block TCP traffic
Explanation: Mixing TCP with UDP It is a general best practice to not mix TCP-based traffic with UDPbased
traffic (especially Streaming-Video) within a single service-provider class because of the behaviors
of these protocols during periods of congestion. Specifically, TCP transmitters throttle back flows when
drops are detected. Although some UDP applications have application-level windowing, flow control, and
retransmission capabilities, most UDP transmitters are completely oblivious to drops and, thus, never lower
transmission rates because of dropping. When TCP flows are combined with UDP flows within a single
service-provider class and the class experiences congestion, TCP flows continually lower their
transmission rates, potentially giving up their bandwidth to UDP flows that are oblivious to drops. This
effect is called TCP starvation/UDP dominance. TCP starvation/UDP dominance likely occurs if (TCP-based) Mission-Critical Data is assigned to the same service-provider class as (UDP-based) Streaming-
Video and the class experiences sustained congestion. Even if WRED is enabled on the service-provider
class, the same behavior would be observed because WRED (for the most part) manages congestion only
on TCP-based flows. Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/
Topic 2, Layer 2 Technologies
13. Prior to enabling PPPoE in a virtual private dialup network group, which task must be completed?
A. Disable CDP on the interface.
B. Execute the vpdn enable command.
C. Execute the no switchport command.
D. Enable QoS FIFO for PPPoE support.
Enabling PPPoE in a VPDN Group
Perform this task to enable PPPoE in a virtual private dial-up network (VPDN) group.
This task applies only to releases prior to Cisco IOS Release 12.2(13)T.
6.protocol pppoe DETAILED STEPS Command or Action Purpose Step 1 enable Enables privileged EXEC
mode. Example: · Enter your password if Router> enable prompted. Step 2 configure terminal Enters
global configuration mode. Example: Router# configure terminal Step 3 vpdn enable Enables virtual private
dialup Example: networking. Router(config)# vpdn enable Step 4 vpdn-group name Associates a VPDN
group with a Example: customer or VPDN profile. Router(config)# vpdn-group group1 Step 5 request-dialin
Creates a request-dialin VPDN Example: subgroup. Router(config-vpdn)# request-dialin Step 6 protocol
pppoe Enables the VPDN subgroup to Example: establish PPPoE Router(config-vpdn-req-in)# pro tocol
Q60. Which type of BGP AS number is 64591?
A. a private AS number
B. a public AS number
C. a private 4-byte AS number
D. a public 4-byte AS number