Cisco 300-101 Free Practice Questions

Answer: D 

Explanation: 

show ipv6 traffic Field Descriptions

Field Description

source- Number of source-routed packets.

routed

truncated Number of truncated packets.

format Errors that can result from checks performed on header fields, errors the version number, and

packet length.

not a Message sent when IPv6 unicast routing is not enabled.

router

Reference:

http://www.cisco.com/c/en/us/td/docs/ios/ipv6/command/reference/ipv6_book/ipv6_16.html

Answer: A 

Explanation: 

Answer: A 

Explanation: 

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 172.16.201.28 traps version 2c CISCORO 

B. router(config)#snmp-server host 172.16.201.28 informs version 2c CISCORO 

C. router(config)#snmp-server host 172.16.201.28 traps version 3 auth CISCORO 

D. router(config)#snmp-server host 172.16.201.28 informs version 3 auth CISCORO 

Answer: D 

Explanation: 

Access list 2 is more specific, allowing only 1.2.3.0/24, whereas access list 1 permits all 1.0.0.0/8

networks. This question also asks us to apply this distribute list only to the outbound direction of the fast Ethernet 0/0 interface, so the correct command is "distribute list 2

out FastEthernet0/0."

Answer: A 

Explanation: 

Answer: D 

Explanation: 

With PPPoE, the two authentication options are PAP and CHAP. When CHAP is enabled on

an interface and a remote device attempts to connect to it, the access server sends a CHAP packet to the

remote device. The CHAP packet requests or "challenges" the remote device to respond. The challenge

packet consists of an ID, a random number, and the host name of the local router. When the remote device

receives the challenge packet, it concatenates the ID, the remote device's password, and the random

number, and then encrypts all of it using the remote device's password. The remote device sends the

results back to the access server, along with the name associated with the password used in the

encryption process. When the access server receives the response, it uses the name it received to retrieve

a password stored in its user database. The retrieved password should be the same password the remote

device used in its encryption process. The access server then encrypts the concatenated information with

the newly retrieved password--if the result matches the result sent in the response packet, authentication

succeeds. The benefit of using CHAP authentication is that the remote device's password is never

transmitted in clear text (encrypted). This prevents other devices from stealing it and gaining illegal access

to the ISP's network. Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/security/configuration/

guide/fsecur_c/scfathen.ht ml

Answer: B 

Explanation: 

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

Answer: B 

Explanation: 

When a router crashes, it is sometimes useful to obtain a full copy of the memory image (called a core

dump) to identify the cause of the crash. Core dumps are generally very useful to your technical support representative.

Four basic ways exist for setting up the router to generate a core dump:

Using Trivial File Transfer Protocol (TFTP)

Using File Transfer Protocol (FTP)

Using remote copy protocol (rcp)

Using a Flash disk Reference: http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/

tr19aa.html

Answer: A 

Explanation: 

Flow monitors are the NetFlow component that is applied to interfaces to perform network

traffic monitoring. Flow monitors consist of a record and a cache. You add the record to the flow monitor

after you create the flow monitor. The flow monitor cache is automatically created at the time the flow

monitor is applied to the first interface. Flow data is collected from the network traffic during the monitoring

process based on the key and nonkey fields in the record, which is configured for the flow monitor and

stored in the flow monitor cache. Reference: http://www.cisco.com/c/en/us/td/docs/ios/fnetflow/command/

reference/fnf_book/fnf_01.html#w p1314030

Answer: C 

Explanation: 

The private IP address ranges defined in RFC 1918 are as follows:

10.0.0.0 - 10.255.255.255

172.16.0.0 - 172.31.255.255

192.168.0.0 - 192.168.255.255 

These IP addresses should never be allowed from external networks into a

corporate network as they would only be able to reach the network from the outside via routing problems or

if the IP addresses were spoofed. This ACL is used to prevent all packets with a spoofed reserved private

source IP address to enter the network. The log keyword also enables logging of this intrusion attempt.

Answer: D 

Explanation: 

PPPoE is composed of two main phases:

Active Discovery Phase--In this phase, the PPPoE client locates a PPPoE server, called an access concentrator. During this phase, a Session ID is assigned and the PPPoE layer is established.

PPP Session Phase--In this phase, PPP options are negotiated and authentication is performed. Once the

link setup is completed, PPPoE functions as a Layer 2 encapsulation method, allowing data to be transferred over the PPP link within PPPoE headers.

Reference: 

http://www.cisco.com/c/en/us/td/docs/security/asa/asa92/configuration/vpn/asa-vpn- cli/vpnpppoe.html

Answer: A 

Explanation: R4 and R2 configs are as shown below: 

Clearly we see the actual key chain is named CISCO. 

Answer: B 

Explanation: 

Answer: E 

Explanation: 

NPTv6 provides a mechanism to translate the private internal organization prefixes to public globally

reachable addresses. The translation mechanism is stateless and provides a 1:1 relationship between the internal addresses and external addresses. The use cases for NPTv6 outlined in the RFC include peering with partner networks, multi homing, and redundancy and load sharing.

Reference:

http://www.cisco.com/c/dam/en/us/td/docs/solutions/SBA/August2012/Cisco_SBA_BN_IPv6AddressingGuide-Aug2012.pdf

Answer: A 

Explanation: 

The standby track command allows you to specify another interface on the router for the

HSRP process to monitor in order to alter the HSRP priority for a given group. If the line protocol of the

specified interface goes down, the HSRP priority is reduced. This means that another HSRP router with

higher priority can become the active router if that router has standby preempt enabled. Loopback

interfaces can be tracked, so when this interface is shut down the HSRP priority for that router will be

lowered and the other HSRP router will then become the active one. Reference: http://www.cisco.com/c/

en/us/support/docs/ip/hot-standby-router-protocol- hsrp/13780-6.html

Answer: Here are the solution as below: 

Explanation: 

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 

R3(config-router)# end 

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> enable 

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.”