Sections
1. Introduction
2. TCP/IP
3. IP Addressing / VLSM
4. Introduction to Cisco IOS
5. Managing Cisco IOS
6. IP Routing
7. Security
8. NAT
9. Switching
10.VLAN
11. IPv6
12.WAN
13.Drag & Drop
14.Simulati
...
Sections
1. Introduction
2. TCP/IP
3. IP Addressing / VLSM
4. Introduction to Cisco IOS
5. Managing Cisco IOS
6. IP Routing
7. Security
8. NAT
9. Switching
10.VLAN
11. IPv6
12.WAN
13.Drag & Drop
14.Simulation
15.Netflow
16.SNMP/HSRP/GLBP
17.Syslog
200-120
QUESTION 1
Refer to the exhibit. What will Router1 do when it receives the data frame shown? (Choose three.)
A. Router1 will strip off the source MAC address and replace it with the MAC address 0000.0c36.6965.
B. Router1 will strip off the source IP address and replace it with the IP address 192.168.40.1.
C. Router1 will strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320.
D. Router1 will strip off the destination IP address and replace it with the IP address of 192.168.40.1.
E. Router1 will forward the data packet out interface FastEthernet0/1.
F. Router1 will forward the data packet out interface FastEthernet0/2.
Correct Answer: ACF
Section: Introduction to Cisco IOS
Explanation
Explanation/Reference:
The router will decapsulate the frame, thus removing the source and destination MAC addresses. It will
consult its routing table to work out on which interface to send the packet which is going to 192.168.40.5:
interface FastEthernet0/2. The router will then encapsulate the packet into a new frame with its own MAC
address as the source MAC address and the MAC address of 192.168.40.5 as the destination MAC
address.
Looking at the ARP table, the MAC address for 192.168.40.5 is 0000.0c07.4320 (the one which has been
dynamically learned and has age 9 minutes). So what is the router’s MAC address on this link? The ARP
table shows a static entry (no age) for 192.168.40.1 which is 0000.0c36.6965. As it is static, we can
conclude that these are the router’s IP and MAC address.
QUESTION 2
Refer to the exhibit. Which three statements correctly describe Network Device A? (Choose three.)
A. With a network wide mask of 255.255.255.128, each interface does not require an IP address.
B. With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique
IP subnet.
C. With a network wide mask of 255.255.255.0, it must be a Layer 2 device for the PCs to communicate
with each other.
D. With a network wide mask of 255.255.255.0, it must be a Layer 3 device for the PCs to communicate
with each other.
E. With a network wide mask of 255.255.254.0, each interface does not require an IP address.
Correct Answer: BDE
Section: IP Routing
Explanation
Explanation/Reference:
If the device is a Layer 2 transparent device (hub, bridge, switch) then the two PCs must be on the same
subnet. The smallest subnet which would contain both of the IP addresses is 10.1.0.0/23 with the range
10.1.0.0 up to 10.1.1.255. The mask for this is 255.255.254.0. On the other hand, if the device is a router,
then we would need a netmask smaller than 255.255.254.0 and we would have two subnets.
The masks of 255.255.255.128 and 255.255.255.0 are both smaller than 255.255.254.0, so this rules out A
and C as the answer and confirms B and D as the answer. E is the situation where we have the smallest
subnet that contains both IP addresses, so we can have a Layer 2 device which does not require an IP
address.
QUESTION 3
Which layer in the OSI reference model is responsible for determining the availability of the receiving
program and checking to see if enough resources exist for that communication?
A. transport
B. network
C. presentation
D. session
E. application
Correct Answer: E
Section: Introduction
Explanation
Explanation/Reference:
Programs live at the top end of the OSI model, so this rules out the network (delivery of packets across
multiple links) and transport (end-to-end reliability and ports). The presentation layer is concerned with the
representation of data. The session layer provides the mechanism for opening, closing and managing a
session between end-user application processes, i.e., a semi-permanent dialogue (Wikipedia).
Wikipedia says: In the OSI model, the definition of its application layer is narrower in scope. The OSI model
defines the application layer as being the user interface. The OSI application layer is responsible for
displaying data and images to the user in a human-recognizable format. So the best answer is the
application layer, as this will see if there is a program (user interface) available to receive communications.
QUESTION 4
Which of the following describes the roles of devices in a WAN? (Choose three.)
A. A CSU/DSU terminates a digital local loop.
B. A modem terminates a digital local loop.
C. A CSU/DSU terminates an analog local loop.
D. A modem terminates an analog local loop.
E. A router is commonly considered a DTE device.
F. A router is commonly considered a DCE device.
Correct Answer: ADE
Section: WAN
Explanation
Explanation/Reference:
Modems and CSU/DSU are considered DCE: data communications equipment, parts of the WAN itself.
Routers are considered DTE: data terminating equipment, right on the edge of the WAN and not really part
of it. Modems are considered to be analog devices and terminate an analog local loop. CSU/DSU devices
are considered to be digital and terminate a digital local loop.
QUESTION 5
Refer to the exhibit.
Host A pings interface S0/0 on router 3. What is the TTL value for that ping?
A. 252
B. 253
C. 254
D. 255
Correct Answer: B
Section: IP Addressing / VLSM
Explanation
Explanation/Reference:
The default TTL is 255, and as a packet passes through a router the TTL is decremented. By the time the
ping packet reaches S0/0 on Router 3, it has passed through two routers and the TTL is now 253. Note that
the S0/0 interface responds to the ping: the packet is not routed by Router 3 and so the TTL in the ping
packet is not decremented to 252.
QUESTION 6
A network administrator is verifying the configuration of a newly installed host by establishing an FTP
connection to a remote server.
What is the highest layer of the protocol stack that the network administrator is using for this operation?
A. application
B. presentation
C. session
D. transport
E. internet
F. data link
Correct Answer: A
Section: TCP/IP
Explanation
Explanation/Reference:
FTP is an application layer protocol, so this is the highest OSI layer involved in the operation.
QUESTION 7
Refer to the exhibit. After HostA pings HostB, which entry will be in the ARP cache of HostA to support this
transmission?
A.
B.
C.
D.
E.
F.
Correct Answer: D
Section: IP Routing
Explanation
Explanation/Reference:
Hosts A and B are on different subnets and are separated by routers, so the MAC address of HostB will
never get back to HostA: Router2 will decapsulate the frames that HostB sends. Router1 will reencapsulate
the ping packet sent by HostB and put its own MAC address in the frame. Therefore, HostA
will put 192.168.6.1 and 000f.2480.8916 into its ARP table as a dynamic entry.
QUESTION 8
A network interface port has collision detection and carrier sensing enabled on a shared twisted pair
network. From this statement, what is known about the network interface port?
A. This is a 10 Mb/s switch port.
B. This is a 100 Mb/s switch port.
C. This is an Ethernet port operating at half duplex.
D. This is an Ethernet port operating at full duplex.
E. This is a port on a network interface card in a PC.
Correct Answer: C
Section: Introduction
Explanation
Explanation/Reference:
The only time that CSMA/CD (carrier sense medium access with collision detection) is ever needed is when
the medium is shared by all devices. In this situation, devices can never send and receive at the same time;
they must operate in half-duplex mode. The bitrate is irrelevant.
QUESTION 9
A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame
is then discarded. At which OSI layer did this happen?
A. physical
B. session
C. data link
D. transport
E. network
Correct Answer: C
Section: Introduction
Explanation
Explanation/Reference:
Operations on frames occur at the data link layer.
QUESTION 10
Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two)
A. The transport layer divides a data stream into segments and may add reliability and flow control
information.
B. The data link layer adds physical source and destination addresses and an FCS to the segment.
C. Packets are created when the network layer encapsulates a frame with source and destination host
addresses and protocol-related control information.
D. Packets are created when the network layer adds Layer 3 addresses and control information to a
segment.
E. The presentation layer translates bits into voltages for transmission across the physical link.
Correct Answer: AD
Section: Introduction
Explanation
Explanation/Reference:
The key word here is encapsulation. The transport layer breaks the stream into segments, with ports,
reliability and flow control fields added (TCP) (A). The network layer encapsulates the segment (not a
frame) into packets by adding layer 3 addresses (D). The data link layer adds physical source and
destination addresses and an FCS to a packet, not a segment.
QUESTION 11
Refer to the graphic.
Host A is communicating with the server. What will be the source MAC address of the frames received by
Host A from the server?
A. the MAC address of the server network interface
B. the MAC address of host A
C. the MAC address of router interface e1
D. the MAC address of router interface e0
Correct Answer: D
Section: Introduction
Explanation
Explanation/Reference:
Host A and the Server are on different subnets and are separated by routers, so the MAC address of the
Server will never get back to Host A: the router will decapsulate the frames that the Server sends. The
router will re-encapsulate the packets from the Server and and put its own MAC address on the outbound
interface (e0) in the frames. Host A will see the MAC address of router interface e0.
QUESTION 12
Refer to the exhibit.
What two results would occur if the hub were to be replaced with a switch that is configured with one
Ethernet VLAN? (Choose two.)
A. The number of broadcast domains would remain the same.
B. The number of collision domains would increase.
C. The number of collision domains would decrease.
D. The number of broadcast domains would decrease.
E. The number of collision domains would remain the same.
F. The number of broadcast domains would increase.
Correct Answer: AB
Section: Introduction
Explanation
Explanation/Reference:
Only routers create broadcast domains, so the number of broadcast domains will be unchanged. A hub is a
single collision domain, whereas each port on a switch is its own collision domain. Therefore, by adding a
switch the number of collision domains will increase.
QUESTION 13
Which three statements accurately describe Layer 2 Ethernet switches? (Choose three)
A. Microsegmentation decreases the number of collisions on the network.
B. If a switch receives a frame for an unknown destination, it uses ARP to resolve the address.
C. Spanning Tree Protocol allows switches to automatically share VLAN information.
D. In a properly functioning network with redundant switched paths, each switched segment will contain
one root bridge with all its ports in the forwarding state. All other switches in that broadcast domain will
have only one root port.
E. Establishing VLANs increases the number of broadcast domains.
F. Switches that are configured with VLANs make forwarding decisions based on both layer 2 and layer 3
address information.
Correct Answer: ADE
Section: Switching
Explanation
Explanation/Reference:
Switches have a collision domain (a segment) on each port. This microsegmentation greatly reduces the
number of devices per segment and decreases collisions (A). Switches only operate at Layer 2, so ARP is
not used (rules out both B and F). Spanning Tree has nothing to do with VLANs. Each VLAN is a separate
broadcast domain, so establishing VLANs adds more broadcast domains (E).
QUESTION 14
Where does routing occur within the DoD TCP/IP reference model?
A. application
B. internet
C. network
D. transport
Correct Answer: B
Section: TCP/IP
Explanation
Explanation/Reference:
In the OSI reference model, routing occurs at Layer 3, i.e. the network layer. However, the question isn’t
asking about OSI, it’s asking about the DoD TCP/IP model! In this model, the internet layer does routing.
QUESTION 15
Which destination addresses will be used by Host A to send data to Host C? (Choose two.)
A. the IP address of Switch 1
B. the MAC address of Switch 1
C. the IP address of Host C
D. the MAC address of Host C
E. the IP address of the router's E0 interface
F. the MAC address of the router's E0 interface
Correct Answer: CF
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