YOU WERE LOOKING FOR: Ccna Routing And Switching Chapter 9 Exam Answers
The ACL is applied to the wrong interface. They are configured in the interface configuration mode. They can be created with a number but not with a name. They filter traffic based on source IP addresses only. The network administrator that has the...
ACLs provide a basic level of security for network access. ACLs assist the router in determining the best path to a destination. Each statement is checked only until a match is detected or until the end of the ACE list. A packet can either be...
Code signing is used to verify the integrity of executable files downloaded from a vendor website. Code signing uses digital certificates to authenticate and verify the identity of a website. DH is an asymmetric mathematical algorithm that allows two computers togenerate an identical shared secret, without having communicated before. Asymmetric key systems are extremely slow for any sort of bulk encryption. This adds authentication to integrity assurance. When two parties share a secret key and use HMAC functions for authentication, the received HMAC digest of a message indicates that the other party was the originator of the message non-repudiationbecause it is the only other entity possessing the secret key. In a hierarchical CA topology, where can a subordinate CA obtain a certificate for itself? In a hierarchical CA topology, CAs can issue certificates to end users and to subordinate CAs, which in turn issue their certificates to end users, other lower level CAs, or both.
In this way, a tree of CAs and end users is built in which every CA can issue certificates to lower level CAs and end users. Only the root CA can issue a self-signing certificate in a hierarchical CA topology. We will update answers for you in the shortest time. CCNA 2 v5. NAT was developed to conserve IPv4 addresses. A side benefit is that NAT adds a small level of security by hiding the internal network addressing scheme. However, there are some drawbacks of using NAT. It does not allow true peer-to-peer communication and it adds latency to outbound connections. Which method is used by a PAT-enabled router to send incoming packets to the correct inside hosts? When traffic returns to the router from the public network, the router would compare the destination port to the PAT mapping table to determine to which inside host the traffic should be sent.
Many Internet protocols and applications depend on end-to-end addressing from the source to the destination. Because parts of the header of the IP packets are modified, the router needs to alter the checksum of the IPv4 packets. Using a single public IP address allows for the conservation of legally registered IP addressing schemes. If an addressing scheme needs to be modified, it is cheaper to use private IP addresses.
Refer to the exhibit. Which address or addresses represent the inside global address? A technician is configuring R2 for static NAT to allow the client to access the web server. What is a possible reason that the client PC cannot access the web server? The command to do this would be R2 config-if ip nat outside. A network administrator configures the border router with the command R1 config ip nat inside source list 4 pool corp. What is required to be configured in order for this particular command to be functional? In order for the ip nat inside source list 4 pool corp command to work, the following procedure needs to be used beforehand: Create an access list that defines the private IP addresses affected by NAT. Use the ip nat inside source list command to associate the access list with the NAT pool. Apply NAT to internal and external interfaces by using the ip nat inside and ip nat outside commands.
When dynamic NAT without overloading is being used, what happens if seven users attempt to access a public server on the Internet when only six addresses are available in the NAT pool? If all the addresses in the NAT pool have been used, a device must wait for an available address before it can access the outside network. Dynamic NAT uses a pool of inside global addresses that are assigned to outgoing sessions. Creating the pool of inside global addresses is accomplished using the ip nat pool command. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco broadband router? A network engineer has configured a router with the command ip nat inside source list 4 pool corp overload. Why did the engineer use the overload option? The source list 4 part of the command refers to the access list that defines what private addresses get translated.
The steps that are required to configure PAT are to define a pool of global addresses to be used for overload translation, to configure source translation by using the keywords interface and overload, and to identify the interfaces that are involved in the PAT. Port forwarding allows a user or program from outside to reach services inside a private network. It is not a technique that allows for using services with nonstandard port numbers. The web server is configured to listen on TCP port The web server is paired with the internal IP address of For easy access by hosts on the Internet, external users do not need to specify the port when visiting the web server. Which command will configure the static NAT? Last Updated on April 4, by Admin. From year to year, Cisco has updated many versions with difference questions.
The latest version is version 6. What is your version? It depends on your instructor creating your class. We recommend you to go thought all version if you are not clear. While you take online test with netacad. Each version have 1 to 10 different questions or more. After you review all questions, You should practice with our online test system by go to "Online Test" link below. CCNA1 Chapter 9 v5. Archer a9 firmware Posted on August 24, by Admin.
Version 5. Because FTP uses TCP as its transport layer protocol, sequence and acknowledgment numbers will identify the missing segments, which will be re-sent to complete the message. Multiplexing is useful for interleaving multiple communication streams. Window size is used to slow down the rate of data communication. Port numbers are used to pass data streams to their proper applications. Acknowledgments are used to notify a sending device that a stream of data packets has or has not been received. Registered ports numbers to are assigned by IANA to a requesting entity to use with specific processes or applications.
These processes are primarily individual applications that a user has chosen to install, rather than common applications that would receive a well-known port number. In a segment, the transport layer header will include the source and destination process, or port numbers. Destination and source physical addressing is included in the frame header. Destination and source logical addressing is included in the network header. Application data is encoded in the upper layers of the protocol stack. A socket is a combination of the source IP address and source port or the destination IP address and the destination port number. The well-know range of port numbers is from 0 — The connected device that receives the segment will respond with an ACK to acknowledge that segment. Choose two. OSPF areas have no direct relationship with the Internet. OSPF areas help to decrease the demand for router memory and processing power by limiting OSPF protocol traffic, keeping link-state databases small, and requiring fewer SPF recalculations.
Multiarea OSPF requires additional steps to configure and therefore does not simplify the configuration process. Only routers within an area share link-state information. This allows OSPF to scale in a hierarchical fashion with all areas that connect to a backbone area. A network administrator is verifying a multi-area OSPF configuration by checking the routing table on a router in area 1. The administrator notices a route to a network that is connected to a router in area 2. Which code appears in front of this route in the routing table within area 1? The ABR has flooded the route into its area so that internal routers may add it to their databases. Label C would indicate a network that is directly connected to an interface on the router. Label O would indicate a network that is advertised by another router in the same area. Type 1 LSAs are known as router link entries. The entry for There are two routes that are O IA, meaning that these are interarea routes.
To reach network The routing table contains more than two intra-area routes. What can be concluded about network In a routing table, a route with the label O indicates a network that is advertised by another router in the same area. In this case, the network designation of 0. Perform the tasks in the activity instructions and then answer the question. What is preventing users who are connected to router R2 from accessing resources located either within the network Which three steps in the design and implementation of a multiarea OSPF network are considered planning steps? Choose three.
Which three statements are generally considered to be best practices in the placement of ACLs? Choose three. Filter unwanted traffic before it travels onto a low-bandwidth link. Refer to the exhibit. A router has an existing ACL that permits all traffic from the What action can the administrator take to block packets from host Manually add the new deny ACE with a sequence number of 5. Create a second access list denying the host and apply it to the same interface. Add a deny any any ACE to access-list 1. An administrator has configured an access list on R1 to allow SSH administrative access from host Which command correctly applies the ACL? The network administrator that has the IP address of The FTP server is also a web server that is accessible to all internal employees on networks within the No other traffic should be allowed to this server. Choose two. Consider the following access list that allows IP phone configuration file transfers from a particular host to a TFTP server: R1 config access-list permit udp host R1 config access-list permit tcp any host Which statement describes a difference between the operation of inbound and outbound ACLs?
Inbound ACLs are processed before the packets are routed while outbound ACLs are processed after the routing is completed. Which three statements describe ACL processing of packets? An implicit deny any rejects any packet that does not match any ACE. A packet that does not match the conditions of any ACE will be forwarded by default.
What does TCP do if the sending source detects network congestion on the path to the destination? The source host will send a request for more frequent acknowledgments to the destination. The source will decrease the amount of data that it sends before it must receive acknowledgements from the destination. The source will acknowledge the last segment that is sent and include a request for a smaller window size in the message. What is a characteristic of UDP? UDP datagrams take the same path and arrive in the correct order at the destination. Applications that use UDP are always considered unreliable.
UDP reassembles the received datagrams in the order they were received. What does a client do when it has UDP datagrams to send? It just sends the datagrams. It sends a simplified three-way handshake to the server. It sends to the server a segment with the SYN flag set to synchronize the conversation. What happens if the first packet of a TFTP transfer is lost? The client will wait indefinitely for the reply. The TFTP application will retry the request if a reply is not received. The transport layer will retry the query if a reply is not received.
A host device is receiving live streaming video. How does the device account for video data that is lost during transmission? The device will immediately request a retransmission of the missing data. The device will use sequence numbers to pause the video stream until the correct data arrives. The device will delay the streaming video until the entire video stream is received.
The device will continue receiving the streaming video, but there may be a momentary disruption. Which three application layer protocols use TCP? Choose three.
What does TCP do if the sending source detects network congestion on the path to the destination? The source host will send a request for more frequent acknowledgments to the destination. The source will decrease the amount of data that it sends before it must receive acknowledgements from the destination. The destination will request retransmission of the entire message. The source will acknowledge the last segment that is sent and include a request for a smaller window size in the message. Explanation: If the source determines that TCP segments are either not being acknowledged or not acknowledged in a timely manner, then it can reduce the number of bytes it sends before receiving an acknowledgment. Notice that it is the source that is reducing the number of unacknowledged bytes it sends.
This does not involve changing the window size in the segment header. What is a characteristic of UDP? UDP datagrams take the same path and arrive in the correct order at the destination. Applications that use UDP are always considered unreliable. UDP reassembles the received datagrams in the order they were received. UDP only passes data to the network when the destination is ready to receive the data. Explanation: UDP has no way to reorder the datagrams into their transmission order, so UDP simply reassembles the data in the order it was received and forwards it to the application.
It just sends the datagrams. It queries the server to see if it is ready to receive data. It sends a simplified three-way handshake to the server. It sends to the server a segment with the SYN flag set to synchronize the conversation. Explanation: When a client has UDP datagrams to send, it just sends the datagrams. What happens if the first packet of a TFTP transfer is lost? The client will wait indefinitely for the reply. The TFTP application will retry the request if a reply is not received. The next-hop router or the default gateway will provide a reply with an error code. The transport layer will retry the query if a reply is not received. A host device is receiving live streaming video. How does the device account for video data that is lost during transmission? The device will immediately request a retransmission of the missing data. The device will use sequence numbers to pause the video stream until the correct data arrives. The device will delay the streaming video until the entire video stream is received.
The device will continue receiving the streaming video, but there may be a momentary disruption. Explanation: When TCP is used as the transport protocol, data must be received in a specific sequence or all data must be fully received in order for it to be used. TCP will use sequence numbers, acknowledgments and retransmission to accomplish this. However, when UDP is used as the transport protocol, data that arrives out of order or with missing segments may cause a momentary disruption, but the destination device may still be able to use the data that it has received. This technology results in the least amount of network delay by providing minimal reliability. Since live streaming video applications use UDP as the transport protocol, the receiver will continue showing the video although there may be a slight delay or reduction in quality.
UDP is the preferred protocol for applications that provide voice or video that cannot tolerate delay. Which three application layer protocols use TCP? Choose three.
Refer to the exhibit. What is indicated by the O IA in the router output? The route was manually configured. The route was learned from within the area. The route was learned from outside the internetwork. The route was learned from another area. A network administrator has been asked to summarize the networks shown in the exhibit as part of a multiarea OSPF implementation.
All addresses are using a subnet mask of What is the correct summarization for these eight networks? The network administrator has been asked to summarize the routes for a new OSPF area. The networks to be summarized are Which command should the administrator use to forward the summary route for area 15 into area 0? Match each type of OSPF router to its description. Not all options are used. Fill in the blank. Do not use acronyms. Use a number. Do not use abbreviations. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. The interface that is connected to the ISP router is down. The network statement is misconfigured on router R1.
What does TCP do if the sending source detects network congestion on the path to the destination? The source host will send a request for more frequent acknowledgments to the destination. The source will decrease the amount of data that it sends before it must receive acknowledgements from the destination. The destination will request retransmission of the entire message. The source will acknowledge the last segment that is sent and include a request for a smaller window size in the message. Explanation: If the source determines that TCP segments are either not being acknowledged or not acknowledged in a timely manner, then it can reduce the number of bytes it sends before receiving an acknowledgment.
Notice that it is the source that is reducing the number of unacknowledged bytes it sends. This does not involve changing the window size in the segment header. What is a characteristic of UDP? UDP datagrams take the same path and arrive in the correct order at the destination. UDP only passes data to the network when the destination is ready to receive the data. Explanation: UDP has no way to reorder the datagrams into their transmission order, so UDP simply reassembles the data in the order it was received and forwards it to the application. It just sends the datagrams. It queries the server to see if it is ready to receive data. It sends a simplified three-way handshake to the server. It sends to the server a segment with the SYN flag set to synchronize the conversation. Explanation: When a client has UDP datagrams to send, it just sends the datagrams. What happens if the first packet of a TFTP transfer is lost? The client will wait indefinitely for the reply. The TFTP application will retry the request if a reply is not received.
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