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Exam Implementing Cisco IP Routing (ROUTE v2.0)
Number 300-101
File Name Cisco.300-101.1e.88q.vcex
Size 5.34 Mb
Posted July 24, 2018
Downloaded 15



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Demo Questions

Question 1

Company A recently acquired Company B and the network infrastructures are being merged. Both organizations used non-overlapping globally unique network addressing but different Interior Gateway Protocols (IGPs). Initially, multiple WAN links will connect the two organizations. Company A will maintain its core routing protocol, and Company B's routing protocol will be the edge routing protocol. Two-way redistribution will be used to ensure full network routing capability. 
What additional routing configuration should be performed to prevent routing loops and suboptimal routing?

  • A: Manually configure static routes.
  • B: Manually configure default routes.
  • C: Manually adjust the administrative distances.
  • D: Manually adjust the local preference attribute.

Correct Answer: C

When routes are being redistributed from the core into the edge and from the edge into the core, the administrative distance (AD) associated with external routes should be modified. This lessens the possibility of sub-optimal routing when multiple routing protocols advertise different paths to the same network. The AD associated with the externally advertised routes should be higher than the internal IGP's AD. To change the AD for an entire routing protocol, use the distance command. An example and the command syntax are shown below:
router(config)#router rip 
router(config-router)#distance 125 
The complete syntax of the distance command is:
distance weight [address mask [ access-list-number | name] 
The weight parameter is the AD, which can be a number from 10 to 255. Note that distances 0 through 9 are reserved for system use. 
To change only the AD for selected networks, use an access list with the distance command as shown below:
router(config)# access-list 5 permit 10.0.0.0 255.0.0.0 
router(config)# access-list 5 permit 11.0.0.0 255.0.0.0 
router(config)# access-list 5 permit 12.0.0.0 255.0.0.0 
router(config)# router rip 
router(config-router)# distance 220 0.0.0.0 255.255.255.255 5 
The 0.0.0.0 255.255.255.255 portion included with the distance command could hold an address/mask combination for a single address, but it is more common to use an access list. 
Objective:
Layer 3 Technologies 
Sub-Objective:
Configure and verify redistribution between any routing protocols or routing sources 
References:
Cisco > Cisco IOS IP Routing: Protocol-Independent Command Reference > distance (ip)
Cisco > Support > Technology Support > IP > IP Routing > Design > Design Technotes > What Is Administrative Distance? > Document ID: 26634




Question 2

Which of the following commands will enable the DHCP and relay services on a Cisco router?

  • A: RouterA(config)# service dhcp
  • B: RouterA(config)# dhcp enable
  • C: RouterA(config)# enable dhcp
  • D: RouterA(config-if)# dhcp enable
  • E: RouterA(config-if)# service dhcp

Correct Answer: A

Using the service dhcp command at global configuration mode will enable the DHCP and relay services on a Cisco router. By default, these services are already enabled on the router, but they can be disabled using the no service dhcp command. Before the DHCP service can actually function, a pool of addresses must be created and any statically defined addresses (such as the router itself) must be excluded. If the router has two interfaces and needs to issue addresses on both interfaces two pools and two exclusion statements must be present. 
Below is an example of a complete configuration taken from a partial output of the show run command. This router has two interfaces 10.0.0.1/24 and 192.168.5.1/24, creating the need for two pools and two exclusion statements. It excludes the address ranges 10.0.0.1-10.0.0.5 from the 10.0.0.0/24 pool and excludes 192.168.5.1-192.168.5.5 from the 192.168.5.0/24 pool, and creates a pool for 10.0.0./24 and 192.168.5.0/24. 

 

The commands RouterA(config)# dhcp enable and RouterA(config)# enable dhcp are incorrect because the syntax is incorrect. 
The command RouterA(config-if)# dhcp enable is incorrect because the syntax is incorrect and because it is executed in interface configuration mode. Enabling DHCP is done at the global prompt. 
The command RouterA(config-if)# service dhcp is incorrect because it is executed in interface configuration mode. Enabling DHCP is done at the global prompt 
Objective:
Layer 3 Technologies 
Sub-Objective:
Identify, configure, and verify IPv4 addressing and subnetting 
References:
Cisco > IP Addressing: DHCP Configuration Guide, Release 15M&T > DHCP Overview
Cisco > Cisco IOS IP Addressing Services Command Reference > service dhcp




Question 3

You are configuring a DHCP server to service a group of clients that are located on a different subnet than the DHCP server itself. What else must you configure to ensure a successful setup?

  • A: Relay agent
  • B: Multicast routing
  • C: Unicast routing
  • D: Access list

Correct Answer: A

If a DHCP server needs to service clients in a different subnet, you will need to configure a relay agent. The relay agent service is enable by default but does not function unless you provide the IP address of the remote DHCP server, which is done by executing the ip helper address command on the interface where the address needs to be announced. 
The fact that the clients are on a different subnet indicates that there is a router between the DHCP server and the clients. The DHCP discover packet that a client sends out is in the form of a broadcast. Routers do not forward broadcast traffic from one segment to the other. Without a relay agent, the DHCP server would never receive the requests. 
A relay agent resides on the same segment as the clients. When a client sends out a discover packet, the relay agent takes the request, converts it to a unicast packet, and forwards the request to the DHCP server on the other network segment. 
The relay agent can also be activated on the router that separates the two network segments. To enable the relay agent service on a Cisco router where 172.16.10.2 is the IP address of the DHCP server, use the following command:
Router(config-if)# ip helper-address 172.16.10.2 
A relay agent can also be used to assist in the auto configuration of a switch. Auto configuration is a process whereby:
1.A switch boots up. 
2.The switch obtains an IP address, subnet mask, and gateway address (optional). 
3.The switch uses the DNS server to locate the TFTP server. 
4.The switch connects to the TFTP server, downloads the configuration file, and applies it.  
When the switch must broadcast to locate the DHCP, DNS, or TFTP server, IP helper addresses can be provided for all of these. When the switch broadcasts, a unicast will be sent to all of these addresses. 
In following illustration, the FastEthernet0 interface of the router is connected to the subnet containing the switch and the FastEthernet1 interface of the router is connected to the subnet containing the DHCP, DNS, and TFTP servers. The addresses involved are:
Switch - 10.2.2.2 
Router - F0 10.2.21, F2 20.2.2.2 
DHCP - 20.2.2.5 
DNS - 20.2.2.6 
TFTP - 20.2.2.7  
The router that is located between the subnet containing the switch and the subnet containing the DHCP, DNS, and TFTP servers should be configured as shown below:

 

Regardless of whether the ip helper-address command has been used to aid in the DHCP configuration of a switch utilizing auto configuration, or to aid DHCP clients in a different subnet from the DHCP server, the DHCP relay service will provide relay services for the following UDP protocols by default:
Trivial File Transfer Protocol (TFTP) (port 69) 
Domain Naming System (DNS) (port 53) 
Time service (port 37) 
NetBIOS Name Server (port 137) 
NetBIOS Datagram Server (port 138) 
Boot Protocol (BOOTP) client and server packets (ports 67 and 68) 
TACACS service (port 49) 
IEN-116 Name Service (port 42)  
This default behavior can be altered with the IP forward-protocol udp command executed in global configuration mode. 
Multicast routing, unicast routing and access lists do not aid in the DHCP communication process. 
Objective:
Layer 3 Technologies 
Sub-Objective:
Identify, configure, and verify IPv4 addressing and subnetting 
References:
Cisco > IP Addressing: DHCP Configuration Guide > Configuring the Cisco IOS DHCP Relay Agent




Question 4

You have two autonomous systems connected by more than one ASBR.  
Which strategy does Cisco recommend in this situation?

  • A: Use two-way redistribution.
  • B: Use a default route in both directions.
  • C: Allow routes to be exchanged in one direction, and use a default route in the other direction.
  • D: Manually configure routes in all ASBRs, and update the configuration each time there is a change in either AS.

Correct Answer: C

If there is a single autonomous system border router (ASBR) connecting two autonomous systems (AS), Cisco generally recommends full two-way route redistribution. But when there are multiple ASBRs, as in this scenario, two-way route redistribution may result in routing loops. One solution is to use a default route in one direction and allow routes to be exchanged in the other direction. 
Default routes in both directions will almost certainly cause routing loops. 
Manual configuration of static routes would work, but the administrative maintenance necessary when there are changes would be considerable. 
Objective:
Layer 3 Technologies 
Sub-Objective:
Configure and verify redistribution between any routing protocols or routing sources 
References:
Cisco > Home > Support > Technology Support > IP Routing > Technology Information > Technology White Paper > OSPF Design Guide > OSPF Design Tips




Question 5

Which command can you use to verify that interfaces have been configured in the correct areas and to show timer intervals and neighbor adjacencies for OSPF?

  • A: show ip ospf
  • B: show ip route
  • C: show ip protocol
  • D: show ip ospf database
  • E: show ip ospf interface

Correct Answer: E

The correct answer is show ip ospf interface. This command displays all of the important OSPF parameters that relate to each of the interfaces. Information can be displayed on a per-interface basis if an interface is specified. If none is specified, all interfaces running OSPF will be displayed.

 

The following commands can be used to monitor and verify OSPF operation:
show ip ospf - displays the number of times the SPF algorithm has run and the default LSU interval, but does not show neighbor adjacencies. 
show ip route - displays known routes and how they were discovered, but not timers and neighbor adjacencies. 
show ip protocol - displays information about timers, filters, metric, etc. for the entire router, but not OSPF neighbor adjacencies. 
show ip ospf database - displays the router ID, the OSPF process ID, and the contents of the topological database, but not adjacencies information or timer values.  
Objective:
Layer 3 Technologies 
Sub-Objective:
Configure and verify OSPF neighbor relationship and authentication 
References:
Cisco > Cisco IOS IP Routing: OSPF Command Reference > show ip ospf interface










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