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Which statement correctly compares traditional networks and controller-based networks?
- Correct Answer: Only controller-based networks decouple the control plane and the data plane. What are two benefits of network automation? - Correct Answer: - Reduced operation costs
- Faster changes with more reliable results What are two characteristics of a controller-based network? - Correct Answer: - It uses northbound and southbound APIs to communicate between architectural layers.
- It moves the control plane to a central point. Which two capabilities of Cisco DNA Center make it more extensible? - Correct Answer:
- REST APIs that allow for external applications to interact natively with Cisco DNA Center
- SDKs that support interaction with third-party network equipment What makes Cisco DNA Center different from traditional network management applications and their management of networks? - Correct Answer: It abstracts policy from the actual device configuration. Which API is used in controller-based architectures to interact with edge devices? - Correct Answer: southbound Which two SNMP actions are used by an NMS (Network Management Station) to extract information from an SNMP agent? - Correct Answer: getNext get What does both RED and WRED address? - Correct Answer: tail drop
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it does NOT address strict-priority queuing What best describes why WRED is useful for networks where the majority of traffic uses TCP? - Correct Answer: - TCP packets that are dropped must be re-transmitted
- TCP sources reduce traffic flow when congestion occurs What is the MAC address represents an IP multicast address? - Correct Answer: 01 - 00 - 5E-0F-0F-0F What are two true things regarding physical connections in the Cisco ACI architecture reguarding spine and leaf? - Correct Answer: - Each spine node must connect to every leaf node
- Each leaf node must connect to every spine mode What is a Cisco ACI? - Correct Answer: Data center technology that uses switches, categorized as spine and leaf nodes, to dynamically implement network application policies in response to application-level needs. Network policies are defined on a APIC (Application Policy Infrastructure Controller) and then implemented by the spine and leaf nodes. What term is used to describe an Ethernet frame that exceeds 1,518 bytes and has a bad FCS value? - Correct Answer: Giant *Remember the default MTU size for Ethernet frames is 1,500 bytes. What table is used by a switch to discover the relationship between the L2 address of a device and the physical port used to reach the device? - Correct Answer: CAM table *The switch makes forwarding decisions based on destination MAC address, it searches the CAM table for and entry that matches. If not found, it then forwards the frame to all its ports except the one it was received from.
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What are IPv6 anycast routing protocol used for? - Correct Answer: to send packets to the closest device that is configured with an anycast address. Ideal for load balancing. What are IPv6 global unicast address used for? - Correct Answer: AKA aggregatable global address, deisgned to minimize the size of internet routing tables. What best describes what occurs when a packet must be re-sent because of an interruption that occurs before the 64th byte has been transmitted? - Correct Answer: A collision occurs What is the IPv6 prefix for global aggregatable unicast address? - Correct Answer: 2000::/ What prefix will an IPv6-enabled computer use to automatically configure an IPv6 address for itself? - Correct Answer: FE80::/ In IPv6, Unicast packets are used for one-to-one communication - Correct Answer: TRUE In IPv6, Link-local addresses are unique only on the local segment and not routable - Correct Answer: TRUE Unicast link-local address are used for neighbor discovery and for environments in which no router is present to provide a routable IPv6 prefix - Correct Answer: TRUE On which interface is the OSPF broadcast network type enabled by default? - Correct Answer: - Ethernet
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On which interface is the OSPF NONBROADCAST network type enabled by default? - Correct Answer: - Frame Relay
- X. On which interface is the OSPF POIN-TO-POINT network type enabled by default? - Correct Answer: - HDLC
- PPP What OSPF network type has a default Hello timer of 10 seconds and a default dead timer of 40 seconds? - Correct Answer: Point-to-Point Broadcast What OSPF network has a default Hello timer of 30 seconds and a default dead timer of 120 seconds? - Correct Answer: - Nonbroadcast
- point-to-multipoint
- point-to-multipoint nonbroadcast What is true regarding a floating static route? - Correct Answer: A floating static route is used to provide link redundancy In OSPF, neighbor routers that are neither the DR nor BDR remain in what state? - Correct Answer: 2 - Way Sate In OSPF, routers that are DR or BDR will be in what state? - Correct Answer: FULL What Cisco-proprietary FHRP that elects an AVG and up to four primary AVFs? - Correct Answer: GLBP
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WLAN Components: Describe Wireless LAN Controller - Correct Answer: Devices that manages access points Which two values or settings must be entered when configuring a new WLAN in the Cisco Wireless LAN Controller GUI? (Choose two.) - Correct Answer: SSID Profile Name Which attribute does a router use to select the best path when two or more different routes to the same destination exist from two different routing protocols? - Correct Answer: Administrative Distance Which two actions influence the EIGRP route selection process? (Choose two.) - Correct Answer: - The router calculates the feasible distance of all paths to the destination route.
- The router calculates the best backup path to the destination route and assigns it as the feasible successor. Which two outcomes are predictable behaviors for HSRP? (Choose two.) - Correct Answer: - The two routers negotiate one router as the active router and the other as the standby router.
- The two routers share a virtual IP address that is used as the default gateway for devices on the LAN. How does HSRP provide first hop redundancy? - Correct Answer: It uses a shared virtual MAC and a virtual IP address to a group of routers that serve as the default gateway for hosts on a LAN. In OSPF, what is the default OSPF type for ETHERNET interfaces? - Correct Answer: Broadcast
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In OSPF, what is the default OSPF type for SERIAL interfaces? - Correct Answer: Point-to-Point Which command enables a router to become a DHCP client? - Correct Answer: ip address dhcp What is the primary difference between AAA authentication and authorization? - Correct Answer: Authentication identifies and verifies a user who is attempting to access a system, and authorization controls that tasks the user can perform. Which two encoding methods are supported by REST APIs? - Correct Answer: XML JSON Which two keying mechanisms are available within MACsec? - Correct Answer: SAP MKA What is MACsec? - Correct Answer: MACsec provides Layer 2 encryption on the LAN. It also encapsulates and protects the metadata field that carries the Security Group TAG (SGT). Currently, two keying mechanisms are available: Security Association Protocol (SAP) and MAC Security Key Agreement (MKA). Which two features are supported on the Cisco Adaptive Security Virtual Appliance? - Correct Answer: High Availability Site-to-site VPN Which type of authentication and encryption does SNMPv3 use at the authPriv security level? - Correct Answer: MD5 or SHA authentication with DES encryption Which protocol sends authentication and accounting in different requests? - Correct Answer: TACACS+
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There are two types of WLANs you can configure by using the WLC GUI: WLAN and Guest LAN. VPN Pass-Through is ONLY available to WLAN. When configuring GUEST LAN by using WLC GUI, what setting are you most likely using the Layer 3 Security drop-down list on the Layer 3 tab? - Correct Answer: Web Authentication Web Passthrough What VLAN is used by DTP to negotiate a trunk link when 802.1Q encapsulation is configured on the interface? - Correct Answer: NATIVE VLAN Virtual MAC address of HSRP version 2? - Correct Answer: 0000.0C9F.F00A An API provides data to an administrator from a centralized controller. What network management technique is being used? - Correct Answer: Network Automation What command will automatically enable SSH on a router? - Correct Answer: crypto key generate rsa What Cisco lightweight AP modes provides BSSs? - Correct Answer: local
- Default lightweight AP mode What encryption is used to provide MICs and encryption in WPA2? - Correct Answer: AES CCMP AD of IS-IS? - Correct Answer: 115
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What language format is a REST API encoding format that uses HTML-like tags to define blocks of data? - Correct Answer: XML What is a duplex? - Correct Answer: communication system is a point-to-point system of two devices that can communicate with each other in both direction What is half-duplex? - Correct Answer: it cannot send and receive data at the same time. Network hubs run in half-duplex mode in order to prevent collisions. Since hubs are rare in modern LANs, the half-duplex system is not widely used in Ethernet networks anymore. What is a full duplex? - Correct Answer: all nodes can send and receive on their port at the same time. There are no collisions in full-duplex mode, but the host NIC and the switch port must support the full-duplex mode What is the IEEE of Bluetooth? - Correct Answer: 802.15 WPAN What is WiMAX and it IEEE? - Correct Answer:
- Worldwide Interoperability for Microwave Access
- IEEE 802.16 WWAN In cellular broadband there are two types of cellular networks, what are they? - Correct Answer: Global System for Mobile (GSM) and Code Division Multiple Access (CDMA). GSM is internationally recognized, while CDMA is primarily used in the US. Typically, it is used by rural homeowners and businesses where cable and DSL are not available. It is usually more expensive and requires a clear line of sight. - Correct Answer: Satellite Broadband
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What does WAP stand for and what is it exactly? - Correct Answer: Wireless Access Point more generally just an access point, is a networking hardware devices that allows other Wi-Fi devices to connect to a wired network. What does Wi-Fi stand for? - Correct Answer: Wireless Fidelity technically, this is not the case. Wi-Fi is simply a trademarked term meaning IEEE 802.11x. What is an Autonomous AP? - Correct Answer:
- Standalone devices like a home router. Where the entire WLAN configuration resides on the device.
- Sometimes called thick APs
- do not require a controller to control the AP and it use WLSE for management software
- use for a network that requires only a couple of access points. What does WLC stand for? - Correct Answer: Wireless LAN Controller What does AS stand for? - Correct Answer: Autonomous System What are Controller-based APs? - Correct Answer:
- These devices require no initial configuration and are often called lightweight APs (LAPs).
- Also called thin APs
- Centralized management, configuration, encryption, updates and policy settings through a centralized controller LAPs - Correct Answer: Lightweight Access Points
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LWAPP - Correct Answer: Light Weight Access Point Protocol What is another name for LAPs? - Correct Answer: Controller-based APs LAG - Correct Answer: Link Aggregation Group What is MIMO? - Correct Answer: Multiple Input Multiple Output. Uses multiple antennas to increase available bandwidth for IEEE 802.11n/ac/ax wireless networks. Up to eight transmit and receive antennas can be used to increase throughput. Which of the following components are integrated in a wireless home router?
- Access Point
- Switch
- Router
- Range Extender - Correct Answer: Access Point, Switch, Router What is infrastructure mode in WLAN? - Correct Answer: A wireless router or AP connects wireless clients to a wired distribution system. What is API and what does the acronym stand for as well? - Correct Answer: Application Programming Interface (API) An API is software that allows other applications to access its data or services. It is a set of rules describing how one application can interact with another, and the instructions to allow the interaction to occur. Data formats shared between smart devices often use an Application Programming Interface (API There are four types of web service APIs - Correct Answer: Simple Object Access Protocol (SOAP)
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What portocols are reliable, connection oriented and use TCP? - Correct Answer: FTP, SSH, Telnet, SMTP, DNS, HTTP, POP3, NTP, IMAP4, HTTPS What protocols are unreliable, connectionless and use UDP? - Correct Answer: DNS, DHCP, TFTP, SNMP What is DHCP? - Correct Answer: A protocol used to automate the assignment of IP Address. It stands for Dynamic Host Control Protocol and is the successor to BOOTP. DHCP port number - Correct Answer: 67 What is HSRP? - Correct Answer: HSRP stands for Hot Standby Router Protocol, it was designed for gateway redundancy without addition config on end devices. Routers configured with HSRP present themselves as a single virtual default gateway.
- It is Cisco Proprietary
- has one active router and one standby router What does VRRP stand for? - Correct Answer: Virtual Router Redundancy Protocol Has one master router and multiple backup routers What is VRRP virtual MAC address? - Correct Answer: 0000.5E00.01xx 0000.5E00.01xx, where xx is the value ID for the VRRP group number What is FHRP? - Correct Answer: First-Hop Redundancy Protocol In show ip route command, what letter represents EIGRP? - Correct Answer: D In show ip route command, what letter represents OSPF? - Correct Answer: O
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In show ip route command, what letter represents directly connected routes? - Correct Answer: C In show ip route command, what letter represents static route? - Correct Answer: S In show ip route command, what letter/symbol represents default routes? - Correct Answer: * on a route such as S * 0.0.0.0/0 [1/0] via Fastethernet 0/ In show ip route command, what letter represents local/host connected directly connected? - Correct Answer: L What is PAgP? - Correct Answer: Port Aggregation Protocol is a Cisco proprietary link aggregator protocol that can bundle up to 8 active ports.
- Only uses DESIRABLE and AUTO modes By default the maximum time that a Cisco switch will retain LLDP info before discarding it when it is enabled on an interface is ______ - Correct Answer: 120 seconds By default, a cisco switch will send LLDP advertisements every ____ seconds when LLDP is enabled on an interface - Correct Answer: 30 What is LLDP on a Cisco switch? - Correct Answer: Link Layer Discovery Protocol. OSI layer 2 open standard discovery protocol that is used to facilitate interoperability between Cisco devices and non-Cisco devices. Attributes that can be learned from neighboring devices contain Type, Length, Value (TLV) info including port description, system description and management address.
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- Host on a /18 and it subnet mask - Correct Answer: 16384; 255.255.192.
- Host on a /25 and it subnet mask - Correct Answer: 128; 255.255.255.
- Host on a /26 and it subnet mask - Correct Answer: 64; 255.255.255.
- Host on a /27 and it subnet mask - Correct Answer: 32; 255.255.255.
- Host on a /28 and it subnet mask - Correct Answer: 16; 255.255.255.
- Host on a /29 and it subnet mask - Correct Answer: 8; 255.255.255.
- Host on a /30 and it subnet mask - Correct Answer: 4; 255.255.255.
- Host on a /31 and it subnet mask - Correct Answer: 2; 255.255.255.
- Host on a /32 and it subnet mask - Correct Answer: 1; 255.255.255.
- Host on a /17 and it subnet mask - Correct Answer: 32768; 255.255.128.
- Host on a /16 and it subnet mask - Correct Answer: 65536; 255.255.0.
- 10.255.255. What is the reserved ranges on RFC 1918? - Correct Answer: 10.0.0.0-
- 172.16.0.0-172.31.255.
- 192.168.0.0-192.168.255.
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What is the reserved range for loopback addresses? - Correct Answer: 127.0.0.0- 127.255.255. What is the Class A range of addresses? - Correct Answer: 10.0.0.0 - 10.255.255. What is the Class B range of addresses? - Correct Answer: 172.16.0.0 - 172.31.255. What is the Class C range of addresses? - Correct Answer: 192.168.0.0 - 192.168.255. What do unique local IPv6 unicast prefix always begin with? - Correct Answer: FD or FC Because the first 7 bits of a unique local unicast address are always 1111110 They can not be aggregatable nor summarized. What is the address range if a host IP can not obtain a network address via DHCP? - Correct Answer: 169.254.1.0 to 169.254.254. What protocol uses UDP and TCP? - Correct Answer: DNS (Domain Name System) IPv6 multicast address? - Correct Answer: FF00::/ IPv6 Unicast Link-Local address - Correct Answer: FF80::/ Link local addresses are unicast addresses used for communication over a __________ link
