1-Network Fundamentals - Basic Question_14548700_2023_01_05_20_23
Question 1 What is the difference regarding reliability and communication type between TCP and UDP? A. TCP is reliable and is a connection-oriented protocol UDP is not reliable and is a connectionless protocol B. TCP is not reliable and is a connection-oriented protocol; UDP is reliable and is a connectionless protocol C. TCP is not reliable and is a connectionless protocol; UDP is reliable and is a connection-oriented protocol D. TCP is reliable and is a connectionless protocol; UDP is not reliable and is a connection-oriented protocol`
A
Question 3 How do TCP and UDP differ in the way they guarantee packet delivery? A. TCP uses checksum, acknowledgement, and retransmissions, and UDP uses checksums only. B. TCP uses two-dimensional parity checks, checksums, and cyclic redundancy checks and UDP uses retransmissions only. C. TCP uses checksum, parity checks, and retransmissions, and UDP uses acknowledgements only. D. TCP uses retransmissions, acknowledgement and parity checks and UDP uses cyclic redundancy checks only.
A
Question 25 Why is TCP desired over UDP for application that require extensive error checking, such as HTTPS? A. UDP operates without acknowledgments, and TCP sends an acknowledgment for every packet received. B. UDP reliably guarantees delivery of all packets, and TCP drops packets under heavy load. C. UDP uses flow control mechanisms for the delivery of packets, and TCP uses congestion control for efficient packet delivery. D. UDP uses sequencing data for packets to arrive in order, and TCP offers the capability to receive packets in random order.
A Explanation Note: The flow control mechanism tells the sender the maximum speed at which the data can be sent to the receiver device. One of the popular flow control mechanisms in TCP is the sliding window protocol -> Answer C is not correct. Reference: https://www.baeldung.com/cs/tcp-flow-control-vs-congestion-control Basic Questions
Question 1 Which two statements about the purpose of the OSI model are accurate? (Choose two) A. Defines the network functions that occur at each layer B. Facilitates an understanding of how information travels throughout a network C. Changes in one layer do not impact other layer D. Ensures reliable data delivery through its layered approach
A B
Question 10 What are two functions of a server on a network? (Choose two) A. runs applications that send and retrieve data for workstations that make requests B. achieves redundancy by exclusively (duy nhất ) using virtual server clustering C. housed solely in a data center that is dedicated to a single client D. runs the same operating system in order to communicate with other servers E. handles requests from multiple workstations at the same time
A E
Question 100 What is a function performed by a web server? A. provide an application that is transmitted over HTTP B. send and retrieve email from client devices C. securely store files for FTP access D. authenticate and authorize a user's identity
Answer A
Question 105 Refer to the exhibit. The link between PC1 and the switch is up, but it is performing poorly. Which interface condition is causing the performance problem? A. There is a duplex mismatch on the interface B. There is an issue with the fiber on the switch interface C. There is a speed mismatch on the interface D. There is an
Answer A
Question 26 What is a function of a Layer 3 switch? A. move frames between endpoints limited to IP addresses B. transmit broadcast traffic when operating in Layer 3 mode exclusively C. forward Ethernet frames between VLANs using only MAC addresses D. flood broadcast traffic within a VLAN
Answer A
Question 70 What is a function of Layer 3 switches? A. They route traffic between devices in different VLANs. B. They transmit broadcast traffic when operating in Layer 3 mode exclusively. C. They forward Ethernet frames between VLANs using only MAC addresses. D. They move frames between endpoints limited to IP addresses.
Answer A
Question 67 Refer to the exhibit. Router1#show interface ethernet 1 Ethernet1 is up, line protocol is up Hardware is Lance, address is 0010.7b36.Ibe8 (bia 0010.7b36.Ibe8) Internet address is 10.100.48.240/24 MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:06, output hang never Last clearing of "show interface" counters never Input queue: 1/75/1/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: random early detection(RED) Output queue :0/40 (size/max) 5 minute input rate 1000 bits/sec, 2 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 7558065 packets input, 783768942 bytes, 1 no buffer Received 8280963 broadcasts, 0 runts, 0 giants, 1 throttles 15 input errors, 14278 GRC, 0 frame, 0 overrun, 3 ignored 0 input packets with dribble condition detected 798092 packets output, 50280266 bytes, 0 underruns 0 output errors, 15000 collisions, 0 interface resets 0 babbles, 0 late collision, 179 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out An administrator received a call from a branch office regarding poor application performance hosted at the headquarters. Ethernet 1 is connected between Router1 and the LAN switch. What identifies the issue? A. There is a duplex mismatch. B. The MTU is not set to the default value. C. The link is over utilized. D. The QoS policy is dropping traffic.
Answer A Explanation This interface gets high collision (15000 collisions) so one end may be set to "Half-duplex".
Question 2 What is a similarly between 1000BASE-LX and 1000BASE-T standards? A. Both use the same data-link header and trailer formats B. Both cable types support LP connectors C. Both cable types support RJ-45 connectors D. Both support up to 550 meters between nodes
Answer A Explanation 1000BASE-T standard only supports up to 100 meters while 1000BASE-LX is a standard which uses a 1,270-1,355 nm laser for longer wavelength. It has a distance capability of up to 5 kilometers over a Single-mode fiber -> Answer D is not correct. 1000BASE-LX is an optical fiber Gigabit Ethernet standard so it does not support RJ-45 connectors directly -> Answer C is not correct. 1000BASE-LX only support LC connectors so answer B is not correct.
Question 39 What are network endpoints? A. a threat to the network if they are compromised B. support inter-VLAN connectivity C. act as routers to connect a user to the service prowler network D. enforce policies for campus-wide traffic going to the internet
Answer A Explanation A network endpoint is any device that is physically an end point on a network. Laptops, desktops, mobile phones, tablets, servers, and virtual environments can all be considered endpoints. Network endpoints may be a threat to our networks if they are compromised.
Question 11 What is a similarity between OM3 and OM4 fiber optic cable? A. Both have a 50 micron core diameter B. Both have a 9 micron core diameter C. Both have a 62.5 micron core diameter D. Both have a 100 micron core diameter
Answer A Explanation At present, there are four kinds of c: OM1, OM2, OM3 and OM4. The letters "OM" stand for optical multi-mode. OM3 and OM4 fibers will support upcoming 40 and 100 Gb/s speeds. OM2, OM3, OM4 and OM5 have 50 micron core diameter.
Question 51 Refer to the exhibit. Shortly after SiteA was connected to SiteB over a new single-mode fiber path, users at SiteA report intermittent connectivity issues with applications hosted at SiteB. What is the cause of the intermittent connectivity issue? A. An incorrect type of transceiver has been inserted into a device on the link. B. The wrong cable type was used to make the connection. C. Heavy usage is causing high latency. D. Physical network errors are being transmitted between the two sites.
Answer A Explanation SR stands for Short Reach, and LR stands for Long Reach. SR supports 400metres while LR supports 10 kilometers. In this question, SiteA is using SFP-SR so it is not suitable for 7KM distance.
Question 18 What is the maximum bandwidth of a T1 point-to-point connection? A. 1.544 Mbps B. 2.048 Mbps C. 34.368 Mbps D. 43.7 Mbps
Answer A Explanation The speeds of these links are shown as below: + T1: 1.544 Mbps + 10BaseT: 10 Mbps + 100BaseT (often referred to as FastEthernet): 100Mbps
Question 18 Refer to the exhibit. SiteA#show interface TenGigabitEthernet0/1/0 TenGigabitEthernet0/1/0 is up, line protocol is up Hardware is BUILT-IN-EPA-8x10G, address is aabb.cc00.0100 (bia aabb.cc00.0100) Description: Connection to SiteB Internet address is 10.10.10.1/30 MTU 8146 bytes, BW 10000000 Kbit/sec, DLY 10 usec, reliability 166/255, txload 1/255, rxload 1/255 Full Duplex, 10000Mbps, link type is force-up, media type is SFP-LR 5 minute input rate 265746000 bits/sec, 24343 packets/sec 5 minute output rate 123245000 bits/sec, 12453 packets/sec SiteB#show interface TenGigabitEthernet0/1/0 TenGigabitEthernet0/1/0 is up, line protocol is up Hardware is BUILT-IN-EPA-8x10G, address is 0000.0c00.750c (bia 0000.0c00.750c) Description: Connection to SiteA Internet address is 10.10.10.2/30 MTU 8146 bytes, BW 10000000 Kbit/sec, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Full Duplex, 10000Mbps, link type is force-up, media type is SFP-LR 5 minute input rate 123245000 bits/sec, 15343 packets/sec 5 minute output rate 265746000 bits/sec, 12453 packets/sec Shortly after SiteA was connected to SiteB over a new single-mode fiber path, users at SiteA report intermittent connectivity issues with applications hosted at SiteB. What is the cause of the intermittent connectivity issue? A. Interface errors are incrementing B. An incorrect SFP media type was used at SiteA C. High usage is causing high latency D. The sites were connected with the wrong cable type
Answer A Explanation The txload and rxload on both sites are 1/255 so the interfaces are not busy in transmitting and receiving traffic. But the reliability on SiteA is only 166/255 which indicates input and output errors increase. Reliability is calculated by this formula: reliability = number of packets / number of total frames.
Question 51 What are two similarities between UTP Cat 5e and Cat 6a cabling? (Choose two) A. Both support runs of up to 100 meters. B. Both support runs of up to 55 meters. C. Both operate at a frequency of 500 MHz. D. Both support speeds of at least 1 Gigabit. E. Both support speeds up to 10 Gigabit.
Answer A D
Question 36 Which device segregates a network into separate zones that have their own security policies? A. IPS B. firewall C. access point D. switch
Answer B
Question 41 What is a function of an endpoint? A. It passes unicast communication between hosts in a network B. It is used directly by an individual user to access network services C. It provides security between trusted and untrusted sections of the network D. It transmits broadcast traffic between devices in the same VLAN
Answer B
Question 74 Which device separates networks by security domains? A. access point B. firewall C. intrusion protection system D. wireless controller
Answer B
Question 8 What is the function of a server? A. It transmits packets between hosts in the same broadcast domain B. It provides shared applications to end users C. It routes traffic between Layer 3 devices D. It creates security zones between trusted and untrusted networks
Answer B
Question 80 What is a function of an endpoint on a network? A. allows users to record data and transmit to a file server B. connects server and client devices to a network C. provides wireless services to users in a building D. forwards traffic between VLANs on a network
Answer B chọn lại A
Question 114 Refer to the exhibit. What is a reason for poor performance on the network interface? A. The interface is receiving excessive broadcast traffic. B. The cable connection between the two devices is faulty. C. The interface is operating at a different speed than the connected device. D. The bandwidth setting of the interface is misconfigured
Answer C chọn lại B
Question 11 What is the primary function of a Layer 3 device? A. to analyze traffic and drop unauthorized traffic from the Internet B. to transmit wireless traffic between hosts C. forward traffic within the same broadcast domain D. to pass traffic between different networks
Answer D
Question 12 What is the same for both copper and fiber interfaces when using SFP modules? A. They support an inline optical attenuator to enhance signal strength B. They accommodate single-mode and multi-mode in a single module C. They offer reliable bandwidth up to 100 Mbps in half duplex mode D. They provide minimal interruption to services by being hot-swappable
Answer D
Question 24 Which device permits or denies network traffic based on a set of rules? A. access point B. switch C. wireless controller D. firewall
Answer D
Question 106 What is the difference between 1000BASE-LX/LH and 1000BASE-ZX interfaces? A. 1000BASE-LX/LH interoperates with multimode and single-mode fiber, and 1000BASE-ZX needs a conditioning patch cable with a multimode. B. 1000BASE-ZX is supported on links up to 1000km, and 1000BASE-LX/LH operates over links up to 70 km. C. 1000BASE-ZX interoperates with dual-rate 100M/1G 10Km SFP over multimode fiber, and 1000BASE-LX/LH supports only single-rate. D. 1000BASE-LX/LH is supported on links up to 10km, and 1000BASE-ZX operates over links up to 70 km.
Answer D Explanation Below lists the cabling standards mentioned above Standard Cabling Maximum length 1000BASE- CX Twinaxial cabling 25 meters 100BASE-FX Two strands, multimode 400 m 1000BASE- LX Long-wavelength laser, MM or SM fiber 10 km (SM) 3 km (MM) 1000BASE- SX Short-wavelength laser, MM fiber 220 m with 62.5-micron fiber; 550 m with 50- micron fiber 1000BASE- ZX Extended wavelength, SM fiber 100 km Note: + MM: Multimode + SM: Single-mode Although above list says the maximum length of 1000BASE-ZX is 100km but in practical it is usually from 70 to 80 km depending on link loss.
Question 64 What causes a port to be placed in the err-disabled state? A. latency B. nothing plugged into the port C. shutdown command issued on the port D. link flapping
Answer D Explanation Link flap means that the interface continually goes up and down in a Cisco Switch. The interface is put into the errdisabled state if it flaps more than five times in 10 seconds. The common cause of link flap is a Layer 1 issue such as a bad cable, duplex mismatch, or bad Gigabit Interface Converter (GBIC) card. Look at the console messages or the messages that were sent to the syslog server that state the reason for the port shutdown. 13w0d: %PM-4-ERR_DISABLE: link-flap error detected on Fa0/28, putting Fa0/28 in err-disable state
Question 67 Refer to the exhibit. What is the cause of the issue? A. STP B. shutdown command C. port security D. wrong cable type
Answer D Explanation The "Status" of fa0/1 is "notconnect" so port security is not the issue or it would show the status of "err-disabled". "Shutdown" command is also not the issue as it would show "Administratively down" in the "Status" field of the "show ip interface brief" command. With STP, even if the port is in "Block" (BLK) status but it is still in "up/up" state with the "show ip interface brief" command. With wrong cable type, the port is in "down/down" state, same as there is no connected cable to the port.
Question 57 How do UTP and STP cables compare? A. STP cables are cheaper to produre and easier to install and UTP cables are more expensive and harder to install. B. UTP cables are less prone to crosstalk and interference and STP cables are more prone to crosstalk and interference. C. UTP cables provide faster and more reliable data transfer rates and STP cables are slower and less reliable. D. STP cables are shielded and protect against electromagnetic interference and UTP lacks the same protection against electromagnetic interference.
Answer D Explanation UTP (Unshielded twisted pair) and STP (Shielded twisted pair) are the types of twisted pair cables which act as a transmission medium and imparts reliable connectivity of electronic equipment. Although the design and manufacture are different but both serve the same purpose. The basic difference between UTP and STP is UTP (Unshielded twisted pair) is a cable with wires that are twisted together to reduce noise and crosstalk. On the contrary, STP (Shielded twisted pair) is a twisted pair cable confined in foil or mesh shield that guards the cable against electromagnetic interference.
Question 99 Refer to the exhibit. Traffic that is flowing over interface TenGigabitEthernet0/0 experiences slow transfer speeds. What is the reason for the issue? A. heavy traffic congestion B. queuing drops C. a speed conflict D. a duplex incompatibility
Answer D Explanation We see the collisions are very high compared to the packets output. The is usually the result of duplex mismatch (one is half-duplex, one end is full-duplex for example)
Question 55 Refer to the exhibit. Which two commands must be configured on router R1 to enable the router to accept secure remote- access connections? (Choose two) A. transport input telnet B. username cisco password 0 cisco C. login console D. ip ssh pubkey-chain E. crypto key generate rsa
Answer D E Explanation Configuring the Cisco SSH Server to Perform RSA-Based User Authentication SUMMARY STEPS 1. enable 2. configure terminal 3. hostname name 4. ip domain-name name 5. crypto key generate rsa 6. ip ssh pubkey-chain 7. username username 8. key-string 9. key-hash key-type key-name 10. end Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_ssh/configuration/15-e/sec- usr-ssh-15-e-book/sec-secure-shell-v2.html
Question 2 How do TCP and UDP different in the way they provide reliability for delivery of packets? A. TCP is a connectionless protocol that does not provide reliable delivery of data, UDP is a connection-oriented protocol that uses sequencing to provide reliable delivery B. TCP does not guarantee delivery or error checking to ensure that there is no corruption of data UDP provides message acknowledgement and retransmits data if lost C. TCP provides flow control to avoid overwhelming a receiver by sending too many packets at once, UDP sends packets to the receiver in a continuous stream without checking for sequencing D. TCP uses windowing to deliver packets reliably; UDP provides reliable message transfer between hosts by establishing a three-way handshake
C
Question 81 How do TCP and UDP fit into a query-response model? A. TCP avoids using sequencing, and UDP avoids using acknowledgments. B. TCP uses error detection for packets, and UDP uses error recovery. C. TCP establishes a connection prior to sending data, and UDP sends immediately. D. TCP encourages out-of-order packet delivery, and UDP prevents re-ordering.
C Explanation TCP uses sequencing -> Answer A is not correct. TCP uses error recovery while UDP uses error detection -> Answer B is not correct. TCP does not encourage out-of-order packet delivery. When TCP packets are received out of order, they are buffered for later delivery to the application program rather than being discarded -> Answer D is not correct.
Question 38 What is the difference in data transmission delivery and reliability between TCP and UDP? A. UDP sets up a connection between both devices before transmitting data. TCP uses the three-way handshake to transmit data with a reliable connection. B. TCP transmits data at a higher rate and ensures packet delivery. UDP retransmits lost data to ensure applications receive the data on the remote end. C. UDP is used for multicast and broadcast communication. TCP is used for unicast communication and transmits data at a higher rate with error checking. D. TCP requires the connection to be established before transmitting data. UDP transmits data at a higher rate without ensuring packet delivery.
D
Question 4 How do TCP and UDP differ in the way that they establish a connection between two endpoints? A. TCP uses synchronization packets, and UDP uses acknowledgment packets B. UDP uses SYN, SYN ACK and FIN bits in the frame header while TCP uses SYN, SYN ACK and ACK bits C. UDP provides reliable message transfer and TCP is a connectionless protocol D. TCP uses the three-way handshake and UDP does not guarantee message delivery
D
