CCNA2 Chapter 1

1. What three processes does a router execute when it receives a packet from one network that is destined for another network? (Choose three.)
ans:
decapsulates the Layer 3 packet by stripping off the Layer 2 frame header
uses the destination IP Address in the IP header to look up the next-hop address in the routing table
encapsulates the Layer 3 packet into the new Layer 2 frame and forwards it out the exit interface

2. Which interfaces in the exhibit could be used for a leased line WAN connection? (Choose two.)
ans:
1
4

3. Refer to the exhibit. After host 2 is connected to the switch on the LAN, host 2 is unable to communicate with host 1. What is the cause of this problem?
ans:
Host 1 and host 2 are on different networks.

4. Which of the following is the correct flow of routines for a router startup?
ans:
load bootstrap, load IOS, apply configuration

5. What is the default sequence for loading the configuration file?
ans:
NVRAM, TFTP, CONSOLE

6. Passwords can be used to restrict access to all or parts of the Cisco IOS. Select the modes and interfaces that can be protected with passwords. (Choose three.)
ans:
VTY interface
console interface
privileged EXEC mode

7. Which are functions of a router? (Choose three.)
ans:
packet switching
segmentation of broadcast domains
selection of best path based on logical addressing

8. Refer to the exhibit. Host A pings host B. When R4 accepts the ping into the Ethernet interface, what two pieces of header information are included? (Choose two.)
ans:
destination IP address: 192.168.10.134
destination MAC address: 9999.DADC.1234

9. Refer to the exhibit. What can be concluded from the output of the running-configuration of a router?
ans:
The commands that are displayed determine the current operation of the router.

10. From what location can a router load the Cisco IOS during the boot process? (Choose two.)
ans:
TFTP server
Flash memory

11. Which two statements describe characteristics of load balancing? (Choose two.)
ans:
Load balancing allows a router to forward packets over multiple paths to the same destination network.
Unequal cost load balancing is supported by EIGRP.

12. Refer to the exhibit. What can be concluded from the routing table output in the exhibit? (Choose two.)
ans:
The FastEthernet0/0 and Serial0/0/0 interfaces of this router were configured with an IP address and the no shutdown command.
An IP packet received by this router with a destination address of 198.18.9.1 will be forwarded out of the Serial0/0/0 interface.

13. The serial connection shown in the graphic needs to be configured. Which configuration commands must be made on the Sydney router to establish connectivity with the Melbourne site? (Choose three.)
ans:
Sydney(config-if)# ip address 201.100.53.2 255.255.255.0
Sydney(config-if)# no shutdown
Sydney(config-if)# clock rate 56000

14. What is the outcome of entering these commands?
R1(config)# line vty 0 4
R1(config-line)# password check123
R1(config-line)# login
ans:
sets the password to be used for connecting to this router via Telnet

15. Refer to the exhibit. All routers have a route in its routing table to each network that is shown in the exhibit. Default routes have not been issued on these routers. What can be concluded about how packets are forwarded in this network? (Choose two.)
ans:
If RouterA receives a packet that is destined for 192.168.3.146, it will be forwarded out interface S0/0/1.
If RouterB receives a packet that is destined for 10.5.27.15, it will be forwarded out interface S0/0/1.

16. Refer to the exhibit. The network administrator has configured the router with the interface IP addresses shown for the directly connected networks. Pings from the router to hosts on the connected networks or pings between router interfaces are not working. What is the most likely problem?
ans:
The interfaces must be enabled with the no shutdown command.

17. A network administrator has just entered new configurations into Router1. Which command should be executed to save configuration changes to NVRAM?
ans:
Router1# copy running-config startup-config

18. If a router cannot find a valid configuration file during the startup sequence, what will occur?
ans:
The router will prompt the user for a response to enter setup mode.

19. What header address information does a router change in the information it receives from an attached Ethernet interface before information is transmitted out another interface?
ans:
the Layer 2 source and destination address

20. The network administrator needs to connect two routers directly via their FastEthernet ports. What cable should the network administrator use?
ans:
cross-over

21. Which two statements correctly describe the components of a router? (Choose two.)
ans:
ROM contains diagnostics executed on hardware modules.
Flash memory does not lose its contents during a reboot.