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2021 Nov 300-101 vce:

Q41. A router with an interface that is configured with ipv6 address autoconfig also has a link-local address assigned. Which message is required to obtain a global unicast address when a router is present? 

A. DHCPv6 request 

B. router-advertisement 

C. neighbor-solicitation 

D. redirect 



Autoconfiguration is performed on multicast-enabled links only and begins when a multicastenabled

interface is enabled (during system startup or manually). Nodes (both, hosts and routers) begin

the process by generating a link-local address for the interface. It is formed by appending the interface

identifier to well-known link-local prefix FE80 :: 0. The interface identifier replaces the right-most zeroes of

the link-local prefix. Before the link-local address can be assigned to the interface, the node performs the

Duplicate Address Detection mechanism to see if any other node is using the same link-local address on

the link. It does this by sending a Neighbor Solicitation message with target address as the "tentative"

address and destination address as the solicited-node multicast address corresponding to this tentative

address. If a node responds with a Neighbor Advertisement message with tentative address as the target

address, the address is a duplicate address and must not be used. Hence, manual configuration is

required. Once the node verifies that its tentative address is unique on the link, it assigns that link-local

address to the interface. At this stage, it has IP-connectivity to other neighbors on this link. The

autoconfiguration on the routers stop at this stage, further tasks are performed only by the hosts. The

routers will need manual configuration (or stateful configuration) to receive site-local or global addresses.

The next phase involves obtaining Router Advertisements from routers if any routers are present on the

link. If no routers are present, a stateful configuration is required. If routers are present, the Router

Advertisements notify what sort of configurations the hosts need to do and the hosts receive a global

unicast IPv6 address. Reference: https://sites.google.com/site/amitsciscozone/home/important-tips/ipv6/

ipv6-stateless- autoconfiguration

Q42. A corporate policy requires PPPoE to be enabled and to maintain a connection with the ISP, even if no interesting traffic exists. Which feature can be used to accomplish this task? 

A. TCP Adjust 

B. Dialer Persistent 

C. PPPoE Groups 

D. half-bridging 

E. Peer Neighbor Route 



A new interface configuration command, dialer persistent, allows a dial-on-demand routing (DDR) dialer

profile connection to be brought up without being triggered by interesting traffic. When configured, the dialer persistent command starts a timer when the dialer interface starts up and starts the connection when the timer expires. If interesting traffic arrives before the timer expires, the connection is still brought up and set as persistent. The command provides a default timer interval, or you can set a custom timer interval. To configure a dialer interface as persistent, use the following commands beginning in global configuration mode:

Command Purpose

Step 1 Router(config)# interface dialer Creates a dialer interface and number enters interface

Configuration mode.

Step 2 Router(config-if)# ip address Specifies the IP address and mask address mask of the dialer

interface as a node in the destination network to be called.

Step 3 Router(config-if)# encapsulation Specifies the encapsulation type.


Step 4 Router(config-if)# dialer string Specifies the remote destination to dial-string class class-name call

and the map class that defines characteristics for calls to this destination.

Step 5 Router(config-if)# dialer pool Specifies the dialing pool to use number for calls to this destination.

Step 6 Router(config-if)# dialer-group Assigns the dialer interface to a group-number dialer group.

Step 7 Router(config-if)# dialer-list Specifies an access list by list dialer-group protocol protocol- number or

by protocol and list name {permit | deny | list number to define the interesting access-list-number} packets that can trigger a call. Step 8 Router(config-if)# dialer

(Optional) Specifies the remote-name user-name

authentication name of the remote router on the destination subnetwork for a dialer interface.

Step 9 Router(config-if)# dialer Forces a dialer interface to be persistent [delay [initial] connected at all

times, even in seconds | max-attempts the absence of interesting traffic.





Q43. You have been asked to evaluate how EIGRP is functioning in a customer network. 

What is the advertised distance for the network on R1? 

A. 333056 

B. 1938688 

C. 1810944 

D. 307456 



Q44. Which statement about the NPTv6 protocol is true? 

A. It is used to translate IPv4 prefixes to IPv6 prefixes. 

B. It is used to translate an IPv6 address prefix to another IPv6 prefix. 

C. It is used to translate IPv6 prefixes to IPv4 subnets with appropriate masks. 

D. It is used to translate IPv4 addresses to IPv6 link-local addresses. 



Q45. 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.



2.configure terminal

3.vpdn enable

4.vpdn-group name


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





Up to the minute ccnp route 300-101 testking:

Q46. Which Cisco VPN technology can use multipoint tunnel, resulting in a single GRE tunnel interface on the hub, to support multiple connections from multiple spoke devices? 



C. Cisco Easy VPN 

D. FlexVPN 




ROUTE.com is a small IT corporation that has an existing enterprise network that is running IPv6 0SPFv3. Currently OSPF is configured on all routers. However, R4's loopback address (FEC0:4:4) cannot be seen in R1's IPv6 routing table. You are tasked with identifying the cause of this fault and implementing the needed corrective actions that uses OPSF features and does not change the current area assignments. You will know that you have corrected the fault when R4's loopback address (FEC0:4:4) can be seen in RTs IPv6 routing table. 

Special Note: To gain the maximum number of points you must remove all incorrect or unneeded configuration statements related to this issue. 

Answer: Here is the solution below: 


To troubleshoot the problem, first issue the show running-config on all of 4 routers. Pay more attention to the outputs of routers R2 and R3 The output of the "show running-config" command of R2: 

The output of the "show running-config" command of R3: 

We knew that all areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). In some cases, where this is not possible, we can use a virtual link to connect to the backbone through a non-backbone area. The area through which you configure the virtual link is known as a transit area. In this case, the area 11 will become the transit area. Therefore, routers R2 and R3 must be configured with the area <area id> virtual-link <neighbor router-id>command. + Configure virtual link on R2 (from the first output above, we learned that the OSPF process ID of R2 is 1): 


R2#configure terminal 

R2(config)#ipv6 router ospf 1 

R2(config-rtr)#area 11 virtual-link 

Save the configuration: 


R2#copy running-config startup-config 

(Notice that we have to use neighbor router-id, not R2's router-id + Configure virtual link on R3 (from the second output above, we learned that the OSPF process ID of R3 is 1 and we have to disable the wrong configuration of "area 54 virtual-link"): 


R3#configure terminal 

R3(config)#ipv6 router ospf 1 

R3(config-rtr)#no area 54 virtual-link 

R3(config-rtr)#area 11 virtual-link 

Save the configuration: 


R3#copy running-config startup-config 

You should check the configuration of R4, too. Make sure to remove the incorrect configuration statements to get the full points. 

R4(config)#ipv6 router ospf 1 

R4(config-router)#no area 54 virtual-link 


After finishing the configuration doesn’t forget to ping between R1 and R4 to make sure they work. 

Note. If you want to check the routing information, use the show ipv6 route command, not "show ip route". 

Q48. A network engineer is configuring a routed interface to forward broadcasts of UDP 69, 53, and 49 to Which command should be applied to the configuration to allow this? 

A. router(config-if)#ip helper-address 

B. router(config-if)#udp helper-address 

C. router(config-if)#ip udp helper-address 

D. router(config-if)#ip helper-address 69 53 49 



To let a router forward broadcast packet the command ip helper-address can be used. The broadcasts will

be forwarded to the unicast address which is specified with the ip helper command.

ip helper-address {ip address}

When configuring the ip helper-address command, the following broadcast packets will be forwarded by

the router by default:

TFTP - UDP port 69

Domain Name System (DNS) UDP port 53

Time service - port 37

NetBIOS Name Server - port 137

NetBIOS Datagram Server - port 138

Bootstrap Protocol (BOOTP) - port 67

TACACS UDP port 49 Reference: http://www.cisco-faq.com/163/forward_udp_broadcas.html

Topic 6, Infrastructure Services 

61. A network engineer is configuring SNMP on network devices to utilize one-way SNMP notifications. However, the engineer is not concerned with authentication or encryption. Which command satisfies the requirements of this scenario? 

A. router(config)#snmp-server host traps version 2c CISCORO 

B. router(config)#snmp-server host informs version 2c CISCORO 

C. router(config)#snmp-server host traps version 3 auth CISCORO 

D. router(config)#snmp-server host informs version 3 auth CISCORO 



Most network admins and engineers are familiar with SNMPv2c which has become the

dominant SNMP version of the past decade. It's simple to configure on both the router/switch-side and just

as easy on the network monitoring server. The problem of course is that the SNMP statistical payload is

not encrypted and authentication is passed in cleartext. Most companies have decided that the information

being transmitted isn't valuable enough to be worth the extra effort in upgrading to SNMPv3, but I would

suggest otherwise. Like IPv4 to IPv6, there are some major changes under the hood. SNMP version 2

uses community strings (think cleartext passwords, no encryption) to authenticate polling and trap delivery.

SNMP version 3 moves away from the community string approach in favor of user- based authentication

and view-based access control. The users are not actual local user accounts, rather they are simply a

means to determine who can authenticate to the device. The view is used to define what the user account

may access on the IOS device. Finally, each user is added to a group, which determines the access policy

for its users. Users, groups, views. Reference: http://www.ccnpguide.com/snmp-version-3/

Q49. Which address is used by the Unicast Reverse Path Forwarding protocol to validate a packet against the routing table? 

A. source address 

B. destination address 

C. router interface 

D. default gateway 



The Unicast RPF feature helps to mitigate problems that are caused by the introduction of

malformed or forged (spoofed) IP source addresses into a network by discarding IP packets that lack a

verifiable IP source address. For example, a number of common types of denial-of-service (DoS) attacks,

including Smurf and Tribal Flood Network (TFN), can take advantage of forged or rapidly changing source

IP addresses to allow attackers to thwart efforts to locate or filter the attacks. For Internet service providers

(ISPs) that provide public access, Unicast RPF deflects such attacks by forwarding only packets that have

source addresses that are valid and consistent with the IP routing table. This action protects the network of

the ISP, its customer, and the rest of the Internet. Reference: http://www.cisco.com/en/US/docs/ios/12_2/


Q50. Scenario: 

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? 

A. 1858 

B. 1601 

C. 600 

D. 1569