Download CCNA 200-301 Practice Exam: Chapters 1–3 + Jeremy’s IT Lab Day 1. and more Exams Computer Science in PDF only on Docsity!
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[...] firewalls are software applications that filter traffic entering and exiting a host machine, like a PC. - Host-based A [...] provides connectivity to hosts within the same LAN. - switch A firewall which combines a traditional firewall with more advanced filtering functionalities is known as a '[...] firewall'. - next-generation [...] is a device that accesses a service made available by a server. - client What does LAN stand for? Answer: - Local Area Network A [...] is used to send data over the Internet. - router A computer network is a digital telecommunications network which allows [...] to share resources. - nodes [...] and [...] are also known as 'end hosts' or 'endpoints'. - Servers / clients A [...] monitors and controls network traffic based on configured rules. - firewall A [...] is a device that provides functions or services for clients. - server What kind of network device is a Cisco ASA? Answer: - Firewall A [...] has many network interfaces for end hosts to connect to. - switch
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Routers have [...] network interfaces than switches. - fewer Can a single device be both a client and a server? Answer: - Yes What kind of network device is a Cisco ISR? Answer: - Router What kind of network device is a Cisco Firepower? Answer: - Firewall A [...] is a device that accesses a service made available by a server. - client What kind of network device is a Cisco 'Catalyst'? Answer: - Switch The two computers use a protocol to communicate with the same layer on another computer. The protocol defines a header that communicates what each computer wants to do. - Same-layer interaction on different computers On a single computer, one lower layer provides a service to the layer just above. The software or hardware that implements the higher layer requests that the next lower layer perform the needed function. - Adjacent-layer interaction on the same computer
10BASE-T - 10 - Mbps Ethernet using two pairs of UTP cables Max range 100m Ethernet - A series of LAN standards defined by the IEEE IEEE - Institute of Electrical and Electronics Engineers. A professional organization that develops communications and network standards, among other activities.
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Pins 1 & 2 connected to pins 1 & 2 on the other side. Crossover Cable - UTP RJ-45 cable that connects pins 1 & 2 to pins 3 & 6 on the other side. Used to connect similar devices together such as two routers. Ethernet Address - Synonymous with MAC Address MAC Address - 12 Hexadecimal (48 bit) number that uniquely identifies a device. First 3 bytes are the Organizational Unique ID (OUI) Last 3 bytes are the Vendor Assigned Address Unicast Address - Synonymous with MAC Address Broadcast Address - Address that represents all devices in a LAN. All binary 1's or F's in Hex. Frame Check Sequence - Field in the data link trailer used for error-detection. Transceiver - A device that transmits and receives signals. Multimode Fiber - Uses LEDs to transmit light and uses a larger core. More expensive. Singlemode Fiber - Uses Lasers to transmit light and uses a small core. Travels farther distances.
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Electromagnetic Interference (EMI) - When electricity from one wire disturbs the signal on another. Core - The center fiberglass cylinder of a fiber-optic cable through which light passes. Cladding - The second layer of a Fiber-Optic cable that surrounds the core of the cable. Reflects light back onto the core. Fiber-Optic Cable - A type of cable that uses fiber as a medium to transmit light 10BASE-T - 10 - Mbps Ethernet using two pairs of UTP cables Max range 100m Ethernet - A series of LAN standards defined by the IEEE IEEE - Institute of Electrical and Electronics Engineers. A professional organization that develops communications and network standards, among other activities. Wired LAN - LAN that uses Ethernet or Fiber Cables Ethernet Frame - Ethernet data-link header/trailer + the packet inside 100BASE-T - 100 - Mbps Ethernet using two pairs of UTP cables Max range 100m 1000BASE-T - 1 - Gbps Ethernet using four pairs of UTP cables
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Last 3 bytes are the Vendor Assigned Address Unicast Address - Synonymous with MAC Address Broadcast Address - Address that represents all devices in a LAN. All binary 1's or F's in Hex. Frame Check Sequence - Field in the data link trailer used for error-detection. Transceiver - A device that transmits and receives signals. Multimode Fiber - Uses LEDs to transmit light and uses a larger core. More expensive. Singlemode Fiber - Uses Lasers to transmit light and uses a small core. Travels farther distances. Electromagnetic Interference (EMI) - When electricity from one wire disturbs the signal on another. Core - The center fiberglass cylinder of a fiber-optic cable through which light passes. Cladding - The second layer of a Fiber-Optic cable that surrounds the core of the cable. Reflects light back onto the core. Fiber-Optic Cable - A type of cable that uses fiber as a medium to transmit light
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B. Layer 3 - Which layer of the OSI model does IP run at? Answer: A. Layer 2 B. Layer 3 C. Layer 4 D. Layer 5 A. TCP D. UDP - Which of the following protocols are layer 4 protocols of the OSI model? Answer: A. TCP B. IP C. ARP D. UDP C. ARP - Which protocol is responsible for converting the IP address to a MAC address? Answer: A. IP B. TCP C. ARP D. ICMP A. TCP - Which protocol is responsible for connection-oriented communication? Answer: A. TCP B. IP
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A. Source IP address - What field in the IP header identifies the system that the packet came from? Answer: A. Source IP address B. Protocol C. Destination IP address D. Source Port D. Destination Port - What field in the TCP header is used to specify the target application that the packet is for? Answer: A. Source Port B. Destination IP address C. Source IP address D. Destination Port SMTP, FTP, HTTP - Which three protocols are used in the Application Layer (Layer 7) and use TCP? Answer: SMTP, FTP, HTTP - Which three protocols are used in the Application Layer (Layer 7) and use TCP? Answer: TCP and UDP - Which 2 protocols are most commonly used at the Transport Layer (Layer 4)? Answer: TCP and UDP - Which 2 protocols are most commonly used at the Transport Layer (Layer 4)? Answer: ARP, ICMP, IP - Which 3 layers are most commonly used at the Internet Layer? Answer:
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ARP, ICMP, IP - Which 3 layers are most commonly used at the Internet Layer? Answer: Ethernet - What technology works at the Network Access Layer? Answer: Ethernet - What technology works at the Network Access Layer? Answer: SYN - What is the first stage in the three-way handshake? Answer: SYN - What is the first stage in the three-way handshake? Answer: SYN/ACK - What is the second stage in the three-way handshake? Answer: SYN/ACK - What is the second stage in the three-way handshake? Answer: ACK - What is the third stage in the three-way handshake? Answer: ACK - What is the third stage in the three-way handshake? Answer: adjacent-layer interaction - On the same computer, when two neighboring layers provide services to the other. de-encapsulation - When a computer receives a bits over a link and moves the frame up the higher layers removing the previous PDU headers/trailers during each step. Encapsulation - When a computer sends data and prepares it to be sent over media by placing headers/trailers over the previous layer PDU during each step.
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Which protocol uses a connection-oriented service to deliver files between end systems? Answer: - FTP What do switches do? Answer: - Prevent Ethernet Collisions, Create less collision domains. Mac Address - Physical Address, Layer 2 devices, Which network device functions only at Layer 1 of the OSI model? Answer: - Hub Which transport layer protocol provides best-effort delivery service with no acknowledgment receipt required? Answer: - UDP Which layer of the OSI model controls the reliability of communications between network devices using flow control, sequencing and acknowledgments? Answer: - Transport Layer True statements regarding ICMP packets - TRACERT uses ICMP packets. They are encapsulated within IP datagrams Statements that accurately describe CDP - CDP is a Cisco proprietary protocol. CDP is a datalink layer protocol. CDP can discover directly connected neighboring Cisco devices. How does a switch differ from a hub? Answer: - A switch tracks MAC addresses of directly-connected devices.
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What must occur before a workstation can exchange HTTP packets with a web server? Answer: - A TCP connection must be established between the workstation and the web server. How does TCP differ from UDP? Answer: - TCP provides sequence numbering of packets. TCP provides synchronized communication. A workstation has just resolved a browser URL to the IP address of a server. What protocol will the workstation now use to determine the destination MAC address to be placed into frames directed toward the server? Answer: - ARP What destination MAC address is used in the ARP request? Answer: - ff-ff- ff-ff-ff-ff What are two common TCP applications? Answer: - SMTP and FTP Describe the operation of the CSMA/CD access method? Answer: - The operation of the CSMA/CD access method - In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data. On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or from another vendor? Answer: - CDP At which layer of the OSI model does the protocol that provides the information that is displayed by the show cdp neighbors command operate? Answer: - data link
