
Questions
1-9
1. [RxNx] On an
IP over Ethernet network, when one host sends data to another host, which statement is
most correct. Choose one.
a) Actual communications is between
IP addresses.
b) Actual communications is from IP address on the sender to MAC address on the receiver.
c) Actual communications is between physical addresses.
d) Actual communications is from MAC address on the sender to IP address on the receiver.
e) On an Ethernet network, all communication is via either broadcasts or multicasts.
Answer
c) Actual communications is between physical addresses.
For a host to communicate with
another host a Layer 2 MAC address is required. (Refer to the following capture.)

2. [RINx] On an
IP over Token Ring network, which answer best describes the role of ARP? (Choose one.)
a) ARP is used to map an IP address
to a MAC address.
b) ARP is used to map Ring numbers to IP addresses.
c) ARP is used to map Ring numbers to MAC addresses of the hosts on that ring.
d) ARP is used to map a MAC address to an IP address.
e) ARP is not used on Token Ring networks.
Answer
a) ARP is used to map an IP address to a MAC address.
Address Resolution Protocol (ARP) is
independent of the MAC sublayer of the Data Link Layer, whether it's Ethernet, Token Ring
or ARCnet.
An ARP occurs when a host has a layer 3 address and needs to resolve a Layer 2 MAC
address.
Would the IPX protocol use an ARP? (Keep in mind what IPX uses for the node portion of the
IPX address.)
The following is a ARP request.
The ARP is sent as a broadcast to all stations on the subnet.

3. [RINx] The
role of RARP in an IP over Ethernet network is best described by: (Choose one.)
a) Is used to resolve a MAC address
to an IP address.
b) Is used to resolve an Ethernet NET number to Token Ring number.
c) Is used to resolve an IP address to a MAC address.
d) Is used to resolve Ethernet NET numbers to the major IP network number.
e) RARP is used only on Token Ring networks.
Answer
a) Is used to resolve a MAC address to an IP address.
Reverse Address Resolution Protocol
(RARP) is used when a host has its Layer 2 address and is trying to find its Layer 3
address. A diskless workstation, for instance, may send an RARP for a Layer 3 address.
4. [RINx] At
what layer of the OSI model does ICMP operate?
a) The Application layer
b) The Data link layer
c) The Physical layer
d) The Network layer
e) The Transport layer
f) The Session layer
Answer
d) The Network layer
Below is a capture of an ICMP echo
request which is the first part of a ping.

(This would be followed by an echo
reply.)

5. [RINx] Which
statements about IP numbers are correct? (Choose four.)
a) An IP number can be used to
identify a ring in a Token Ring network.
b) An IP number can be used to identify a serial interface in a router.
c) An IP number can be used to identify a logical Ethernet network.
d) An IP address must be unique only on the logical network where it exists.
e) All bits of an IP number are assigned by InterNIC and may not be modified.
f) An IP address may be 8, 16, 24, or 32 bits long depending upon class.
g) An IP number can be used to identify a Host on a remote logical network.
Answer
a) An IP number can be used to identify a ring in a Token Ring network.
b) An IP number can be used to identify a serial interface in a router.
c) An IP number can be used to identify a logical Ethernet network.
g) An IP number can be used to identify a Host on a remote logical network.
Segmenting LANs with switches and
bridges reduces the number of hosts per wire, which reduces the number of collisions and
gives more available bandwidth per node. On a switch or a bridge, each port is its own
collision domain.
6. [RxNx] Which
of the following are benefits of segmenting with routers?
a) Increases bandwidth available to
nodes
b) Controls broadcasts
c) Increases the size of the frames
d) Reduces the number of collisions
e) None of the above
Answer
a) Increases bandwidth available to nodes
b) Controls broadcasts
d) Reduces the number of collisions
On a router each port is its own
broadcast and collision domain.
7. [RINx] IP
subnetting provides the ability to: (Choose the best answers.)
a) Conserve major network IP
addresses
b) Construct a hierarchical addressing scheme
c) Make networking more complicated so we can make more money
d) Gain access to the intranet
e) None of the above
Answer
a) Conserve IP addresses
b) Construct a hierarchical addressing scheme
8. [RXNx] Which
of the following are true of the IPX addressing scheme:
a) The total address length is 24
bits.
b) The address has a network and a host part.
c) It is hierarchical in nature.
d) The host part is the MAC address of the host.
e) All of the above.
Answer
b) The address has a network and a host part.
d) The node part is the MAC address of the host.
The following is an example of an
IPX ping:
Router_B#ping ipx CAD.0060.09c3.df60
Type escape sequence to abort.
Sending 5, 100-byte IPX cisco Echoes to ...
CAD.0060.09c3.df60, timeout is 2 seconds
!!!!!
Success rate is 100 percent (5/5), ...
round-trip min/avg/max = 4/6/8 ms
CAD is the network address
represented in hex. The network address can contain 8 HEX digits or 32 bits.
0060.09c3.df60 is a MAC address, which is 12 HEX digits or 48 bits.
9. [RANx] Which
of the following are true of an Appletalk address?
a) The total address length is 24
bits.
b) The address has a network and a host part.
c) It is hierarchical in nature.
d) The node part is usually the MAC address of the host.
e) All of the above.
Answer
a) the total address length is 24 bits
b) the address has a network and a host part
The following is a portion of a
router configuration:
interface Serial1
no ip address
appletalk cable-range 106-110 106.59
appletalk zone rightserial
clockrate 4000000
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