Explanation: Remember Cheap Nike Epic React , the source and destination MAC changes as each router hop along with the TTL being decremented but the source and destination IP address remain the same from source to destination.
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 Cheap Epic React Red , each interface does require an IP address on a unique IP subnet. C. With a network wide mask of 255.255.255.0, 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 Cheap Epic React Blue , 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.
Explanation: If Subnet Mask is 255.255.255.128 the hosts vary from x.x.x.0 - x.x.x.127 & x.x.x.128- x.x.x.255 Cheap Epic React Black , so the IP Addresses of 2 hosts fall in different subnets so each interface needs an IP an address so that they can communicate each other. If Subnet Mask is 255.255.255.0 the 2 specified hosts fall in different subnets so they need a Layer 3 device to communicate. If Subnet Mask is 255.255.254.0 the 2 specified hosts are in same subnet so are in network address and can be accommodated in same Layer 2 domain and can communicate with each other directly using the Layer 2 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
Answer: E
Explanation: This question is to examine the OSI reference model. The Application layer is responsible for identifying and establishing the availability of the intended communication partner and determining whether sufficient resources for the intended communication exist.
Question: 4
Which of the following describes the roles of devices in a WAN? (Choose three.)
A. A CSUDSU terminates a digital local loop. B. A modem terminates a digital local loop. C. A CSUDSU 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.
Explanation: The idea behind a WAN is to be able to connect two DTE networks together through a DCE network. The network鈥檚 DCE device (includes CSUDSU) provides clocking to the DTE-connected interface (the router鈥檚 serial interface).
A modem modulates outgoing digital signals from a computer or other digital device to analog signals for a conventional copper twisted pair telephone line and demodulates the incoming analog signal and converts it to a digital signal for the digital device. A CSUDSU is used between two digital lines - For more explanation of answer D, in telephony the local loop (also referred to as a subscriber line) is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the carrier or telecommunications service provider鈥檚 network. Therefore a modem terminates an analog local loop is correct.
Question: 5
Refer to the exhibit.
Host A pings interface S00 on router 3. What is the TTL value for that ping?
A. 252 B. 253 C. 254 D. 255
Answer: B
Explanation: From the CCNA ICND2 Exam book: 鈥淩outers decrement the TTL by 1 every time they forward a packet; if a router decrements the TTL to 0 Cheap Epic React , it throws away the packet. This prevents packets from rotating forever.鈥?I want to make it clear that before the router forwards a packet, the TTL is still remain the same. For example in the topology above Cheap Nike Epic React Red , pings to S01 and S00 of Router 2 have the same TTL. The picture below shows TTL values for each interface of each router and for Host B. Notice that Host A initializes ICMP packet with a TTL of 255:
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
Answer: A
Explanation: FTP belongs to Application layer and it is also the highest layer of the OSI model.
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