ECS3703 EXAM PACK 2023

ECS3703 EXAM PACK 2023 Ensuring that TCP recovers lost and duplicate packets is called _______. a. connection establishment b. segmentation c. flow control d. reliability e. multiplexing ARP is the abbreviation for protocol DHCP is the abbreviation for protocol A socket is a. a unique set of port numbers and IP addresses b. a unique combination of MAC addresses c. an IP address unique across networks d. a combination of port and IP numbers an IP address unique within an network SMTP is used to ______. a. access email remotely b. deliver email to a destination mail server c. manage and monitor networks d. manipulate the contents of the mailbox e. delete mail in the mailbox The amount of data that a sender is allowed to transmit without waiting for an ACK is called a. size of the segment b. size of the flow c. size of the buffer d. size of the window e. size of the channel ______ prevents loops from being formed when switches are interconnected via multiple paths a. Spanning-Tree Protocol b. Shortest-Tree Protocol c. Spanning-Trunk Protocol d. Stop-Traversing Protocol Which of the following is a security protocol designed to ensure private, encrypted client/server communication, and is a successor to SSL? a. IGMP b. FTP c. TFTP d. STFP e. TLS Which of the following are reasons to synchronize clocks over packet-switched networks accurate time is required for many financial transactions time provides the only reference across all devices on a network to accurately timestamp logs to comply with Sarbanes-Oxley all of these are valid reasons The PDU at the transport layer is called a. sequence b. data c. packets d. frames e. segments Which of the following is not true of SMTP? a. uses port 25 b. uses TCP c. supports only ACSII d. almost all email is transmitted using SMTP in MIME format e. uses UDP TFTP is the abbreviation for protocol Dynamic allocation by DHCP is useful for a. routers b. non-server networked devices such as printers c. servers d. client PCs In the TCP/IP model, which of the following best describes the ultimate goal of the transport layer a. To stratify functionality. b. To support the lower layers of the TCP/IP model. c. To provide connection-oriented exchanges d. To move packets from the sending to receiving host. e. To support the computer application running on the host in such a way that as far as the application is concerned, it "sees" no difference, apart from time delay, from getting data from its hard drive or from the network. The sequence number of a TCP segment equals a. Sequence number of the previous segment b. Length of the previous segment c. Sequence number of the previous segment plus the length of the previous segment minus 1 d. Sequence number of the previous segment plus the length of the previous segment e. Sequence number of the previous segment plus the length of the previous segment plus 1 Which of the following protocols is used by applications that manage and monitor networks? a. SNMP b. SMTP c. MIME e. DHCP f. SSL Which of the following is true of NAT? provides a transparent mapping of IP addresses maps a non-routable to routable IPv4 address is a practical solution to the exhaustion of IPv4 addresses maps IP addresses from one IP address block to another IP address block all of these are true Ensuring that TCP disassembles data and reassemble it in proper order is called a. connection establishment b. flow control c. segmentation d. reliability e. multiplexing TCP stands for TLS is the abbreviation for protocol Multiplexing at the transport layer enables _______. a. Multiple hosts to share a common physical medium b. Multiple applications on the host to share a common network/internet-layer connection c. The same host running multiple applications to share a common frame d. Multiple signals to be transmitted on the same channel e. The same application to run on multiple hosts sharing the same packet Allowing TCP to serve multiple applications concurrently is called a. flow control b. connection establishment c. multiplexing d. segmentation e. reliability Which of the following is true of VLANs on a modern Cisco switch? Unless otherwise specified, all ports default into VLAN 1. Enables the logical grouping of end-stations that are physically dispersed on a network. Can reduce network traffic by segmenting a LAN. Can provide an extra measure of network security. All of these are true. The well-known port number for http is ______. Which of the following DHCP mechanisms allocate an IP address to a host for a short period of time based on a first-come first-serve basis from a pool of addresses? a. manual b. static c. automatic and dynamic d. automatic e. dynamic Considering the figure, what is the ACK that the recipient will send back to the sending host if Seq 200 is lost? (Assume the window size is the size of the four segments and each segment is of lenght 100.) a. 200 b. 201 c. 401 d. 400 e. 500 Which protocol gets a MAC address from a known IP address? a. DNS b. Reverse ARP c. ARP d. BHCP e. NAT Which of the following DHCP mechanisms allocates an IP address to a host permanently? a. dynamic b. automatic and manual c. static d. manual e. automatic Station A is transmitting data to Station B and expects an ACK after every 400 bytes. After transmitting data for a while, the two stations determine that the connection can support 600 bytes and make the necessary changes. This is an example of: a. Buffer Control b. Dynamic Host Configuration Protocol c. Three-way handshake e. Stop-and-wait f. Sliding Window NAPT is an abbreviation for protocol