CCNA 1ST MODULE QUESTION AND ANSWER

1 In a connectionless system, which of the following is correct?

The destination is contacted before a packet is sent.

The destination is not contacted before a packet is sent.

The destination sends an acknowledgement to the source that indicates the packet was received.

The destination sends an acknowledgement to the source that requests the next packet to be sent.

2. Which IP packet field will prevent endless loops?

Type-of-service

identification

Flags

Time-to-live

Header checksum

3 Which portion of the network layer address does a router use to forward packets?

Host portion

Broadcast address

Network portion

Gateway address

4  If the default gateway is configured incorrectly on the host, what is the impact on communications?

The host is unable to communicate on the local network.

The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.

The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network.

There is no impact on communications.

5  What is the purpose of a default gateway?

physically connects a computer to a network

provides a permanent address to a computer

identifies the network to which a computer is connected

identifies the logical address of a networked computer and uniquely identifies it to the rest of the network

identifies the device that allows local network computers to communicate with devices on other networks.

6  What type of routing uses information that is manually entered into the routing table?

dynamic

interior

static

standard

7  When the destination network is not listed in the routing table of a Cisco router, what are two possible actions that the router might take? (Choose two.)

The router sends an ARP request to determine the required next hop address.

The router discards the packet.

The router forwards the packet toward the next hop indicated in the ARP table.

The router forwards the packet to the interface indicated by the source address.

The router forwards the packet out the interface indicated by the default route entry.

8  What are the key factors to consider when grouping hosts into a common network? (Choose three.)

gateways

purpose

physical addressing

software version

geographic location

ownership

9  What is a component of a routing table entry?

the MAC address of the interface of the router

the destination Layer 4 port number

the destination host address

the next-hop address

10  Which intermediary devices could be used to implement security between networks? (Choose two.)

router

hub

switch

firewall

access point

bridge

11  What are three common problems with a large network? (Choose three.)

too few broadcasts

performance degradation

security issues

limited management responsibility

host identification

protocol compatibility

12  Which three statements are true about routes and their use? (Choose three.)

If no route to the destination network is found, the packet is returned to the previous router.

If the destination network is directly connected, the router forwards the packet to the destination host.

If m ultiple network entries exist for the destination network, the most general route is used to forward the packet.

If no route exists for the destination network and a default route is present, the packet is forwarded to the next-hop router.

If the originating host has a default gateway configured, the packet for a remote network can be forwarded using that route.

If a host does not have a route manually configured for the destination network, the host will drop the packet.

13 Refer to the exhibit. A network administrator is troubleshooting a connectivity problem and needs to determine the address that is used to forward network packets out the network. Using the netstat -r command, the administrator would identify which address as the address to which all hosts send packets that are destined for an outside network?

10.10.10.26

127.0.0.1

10.10.10.6

10.10.10.1

224.0.0.0

14  What two characteristics are commonly associated with dynamic routing protocols? (Choose two.)

require no device configuration

provide routers with up-to-date routing tables

require less processing power than static routes require

consume bandwidth to exchange route information

prevent manual configuration and maintenance of the routing table

15  What statement describes the purpose of a default route?

A host uses a default route to transfer data to another host on the same network segment.

A host uses a default route to forward data to the local switch as the next hop to all destinations.

A host uses a default route to identify the Layer 2 address of an end device on the local network.

A host uses a default route to transfer data to a host outside the local network when no other route to the destination exists.

16 Which two functions of the OSI model occur at layer two? (Choose two.)

physical addressing

encoding

routing

cabling

media access control

17 What is the primary reason for development of IPv6?
security
header format simplification
expanded addressing capabilities
addressing simplification

18  Which three IP addresses are private? (Choose three
172.168.33.1
10.35.66.70
192.168.99.5
 

 
19 What subnet mask would a network administrator assign to a network address of 172.30.1.0 if it were possible to have up to 254 hosts?
255.255.0.0
255.255.255.0 255.255.254.0
255.255.248.0

20 Given the IP address and subnet mask of 172.16.134.64 255.255.255.224, which of the following would describe this address?
This is a useable host address.
This is a broadcast address.
This is a network address.
This is not a valid address.

21 What three facts are true about the network portion of an IPv4 address? (Choose three.)
identifies an individual device
is identical for all hosts in a broadcast domain
is altered as packet is forwarded
varies in length
is used to forward packets
uses flat addressing

23 What is the network address of the host 172.25.67.99 /23 in binary?
10101100. 00011001.01000011.00000000
10101100. 00011001.01000011.11111111
10101100. 00011001.01000010.00000000
10101100. 00011001.01000010.01100011
10101100. 00010001.01000011. 01100010
10101100. 00011001.00000000.00000000

24 A router interface has been assigned an IP address of 172.16.192.166 with a mask of 255.255.255.248. To which subnet does the IP address belong?
172.16.0.0
172.16.192.0
172.16.192.128
172.16.192.160
172.16.192.168
172.16.192.176

25 What two things will happen if a router receives an ICMP packet which has a TTL value of 1 and the destination host is several hops away? (Choose two.)
The router will discard the packet.
The router will decrement the TTL value and forward the packet to the next router on the path to the destination host.
The router will send a time exceeded message to the source host.
The router will increment the TTL value and forward the packet to the next router on the path to the destination host.
The router will send an ICMP Redirect Message to the source host.