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
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