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112 Cards in this Set
- Front
- Back
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Acronym: CSU/DSU
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Channel Service Unit / Data Service Unit
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T/F: A router is typically considered a DTE device
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TRUE.
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Acronym: DTE and DCE
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DTE: Data Terminal Equipment
DCE: Data Communications Equipment |
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Switches create _________ domains
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Collision
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WAN protocols (encapsulation) typically operate on which two layers of the OSI model?
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Layers 1 and 2 (Physical and Data Link)
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CDP operates on which layer of the OSI model?
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Layer 2
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List all of the layers of the OSI reference model, from highest to lowest.
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7. Application
6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical |
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List all of the layers of the OSI reference model, from lowest to highest.
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1. Physical
2. Data Link 3. Network 4. Transport 5. Session 6. Presentation 7. Application |
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Acronym: PDU
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Protocol Data Unit (used in the OSI model)
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Name the OSI Layer 1 PDU
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Bit
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Name the OSI Layer 2 PDU
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Frame
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Name the OSI Layer 3 PDU
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Packet
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Name the OSI Layer 4 PDU
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Segment
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On which layer of the OSI model does ICMP operate?
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Layer 3 (Network)
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A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is
then discarded. At which OSI layer did this happen? |
Layer 2 (Data Link)
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Name that port: TCP 20
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FTP data
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Name that port: TCP 21
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FTP control
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Name that port: TCP 23
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Telnet
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Name that port: TCP 25
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SMTP
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Name that port: TCP 53
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DNS zone transfers
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Name that port: TCP 100
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POP3
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Name that port: UDP 53
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DNS lookup
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Name that port: UDP 69
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TFTP
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Name that port: UDP 161
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SNMP
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List three types of flow control
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Congestion Avoidance
Buffering Windowing |
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What is the ARP protocol used for?
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Used to determine a MAC address for a known IP address.
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Acronym: CSMA/CD
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Carrier Sense Multiple Access with Collision Detection
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Acronym: CSMA/CA
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Carrier Sense Multiple Access with Collision Avoidance
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After POST, the system LED of a Cisco 2950 switch
turns amber. What is the status of the switch? |
POST failed and there is a problem that prevents the operating system of the switch from being loaded.
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What two values are used by STP to elect a root bridge?
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1. Bridge Priority
2. MAC address |
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Does MTU 1500 bytes refer to frame size or packet size?
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Packet size
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Will a trunk link be formed between SWITCH1 and SWITCH2 if SWITCH1's trunk mode is set to "desirable" and SWITCH2's is set to "auto"?
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Yes
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Will a trunk link be formed between SWITCH1 and SWITCH2 if SWITCH1's trunk mode is set to "auto" and SWITCH2's is set to "auto"?
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No
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What does it mean when a switch port LED is alternating green-amber?
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Link fault. The port is experiencing excessive errors.
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According to 802.1Q, what is recalculated after a 4 byte field is inserted into the original Ethernet frame?
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The FCS
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Protocol: 802.1W
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RSTP (Rapid Spanning Tree Protocol)
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RSTP (give me the IEEE number)
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802.1W
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Protocol: 802.1D
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STP (Spanning Tree Protocol)
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STP (give me the IEEE number)
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802.1D
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What is the default bridge priority in STP?
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32768
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What are the possible port states in RSTP?
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Discarding
Learning Forwarding |
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What are the possible port states in STP?
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Disabled
Blocking Listening Learning Forwarding |
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Define the STP port state "listening"
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Preparing to forward data frames without populating the MAC address table
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Define the STP port state "learning"
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populating the MAC address table but not forwarding data frames
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What type of interface uses encapsulation ARPA and BW of 100000 Kbit?
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FastEthernet
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Do MAC addresses learned dynamically by the "switchport port-security mac-address sticky" command persist after reboot?
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No - they are stored in the running-config. If the running-config is saved, then yes.
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What does RFC 1918 deal with?
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Private IP address space
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What RFC defines the private IP address space?
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RFC 1918
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When an address conflict is detected by a DHCP server, what action does the DHCP server take?
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The address is removed from the DHCP pool for an amount of time configurable by the administrator.
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What type of message does a DHCP client send out when attempting to request an address?
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Layer 3 broadcast (255.255.255.255)
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Name three IPv6 transition tunneling mechanisms
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6to4 tunneling
ISATAP tunneling Teredo tunneling |
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Name the organisation in charge of IP address assignment
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ICANN
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What is the range (prefix) of IPv6 global unicast addresses?
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2000::/3
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What is the range (prefix) of IPv6 multicast addresses?
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FF00::/8
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Explain an EUI-64 interface ID.
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When the interface ID is comprised of the first half of the MAC address (with the 7th bit changed to 1) + FFFE + second half of the MAC address.
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Mac Address = 0034:5678:9ABC
What is the EUI-64 interface ID? |
0234:56FF:FE78:9ABC
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What is the range (prefix) of IPv6 unique local unicast addresses?
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FD00::/8
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What is the IPv6 loopback address?
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::1
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What is the range (prefix) of IPv6 link local addresses?
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FE80::/10
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What does ISATAP stand for?
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Intra-site Automatic Tunnel Addressing Protocol
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What devices typically use Teredo tunnels to communicate?
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Hosts
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What devices typically use 6to4 tunnels to communicate?
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Routers
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What is the administrative distance of a static route?
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1
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What is the administrative distance of a connected interface?
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0
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On a Cisco router, what is the default sequence for where to locate IOS on startup?
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1. NVRAM
2. Flash 3. TFTP server 4. ROM (partial IOS) |
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RIP and RIPv2 are __________ routing protocols
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Distance Vector
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OSFP is a _____________ routing protocol
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Link State
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EIGRP is a ___________ routing protocol
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Hybrid
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What is the maximum hop count in RIP and RIPv2
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15
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RIPv1 uses _________ packets for its routing updates
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Broadcast
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RIPv2 uses _________ packets for its routing updates
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Multicast
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What is the default routing update period for RIPv2?
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30 seconds
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What is the default AD for RIP routes?
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120
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What is the default AD for OSPF routes?
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110
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What is the default AD for EIGRP routes?
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90
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What metric(s) does RIP use?
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Hop count
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What metric(s) does OSPF use?
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Bandwidth
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What metric(s) does EIGRP use?
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Bandwidth
Delay |
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List all of the OSPF network types.
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Broadcast
Non-Broadcast Point-to-Point Point-to-Multipoint |
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By default in OSPF, the router with the ________ IP address will be chosen as the DR (highest/lowest)
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highest
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In OSPF, what interface is examined first when determining the router-id?
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loopback
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OSPF hello packets are addressed to what address?
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224.0.0.5
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What value needs to be changed in order to allow load balancing across unequal paths in EIGRP?
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variance
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What IOS command shows CPU utilization?
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show process
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What spread spectrum technology does the 802.11b standard define for operation?
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Direct-sequence spread spectrum (DSSS)
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What is the number scope for extended ACLs?
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100-199 and 2000-2699
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What command is used to map an access list to the VTY terminal?
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access-class
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What is the meaning of the term "dynamic" below?
R1# show frame-relay map Serial0/0 (up): ip 172.16.3.1 dlci 100 (0x64, 0x1840), dynamic broadcast, status defined, active |
The mapping between DLCI 100 and the IP address was learned through inverse ARP
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Name the open standard for Frame Relay encapsulation
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IETF
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What is the advantage of using point-to-point subinterfaces instead of a multipoint interface on the hub of a hub and spoke topology?
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It avoids split-horizon issues with distance vector routing protocols.
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What are the two methods for mapping DLCIs to IP addresses?
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Static mapping
Inverse ARP |
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What DLCI is used for Cisco LMI messages?
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1023
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What DLCI is used for ANSI LMI messages?
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0
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In a Frame Relay environment, what is the function of the DE bit?
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Identification of frames that are transmitted above the CIR, and are eligible for discard.
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A default Frame Relay WAN is classified as what type of physical network?
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NBMA (nonbroadcast multi-access)
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What are the two authentication protocols available with PPP encapsulation?
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PAP and CHAP
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What do routers do with packets addressed to broadcast IPs (192.168.1.255/24)?
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Drop it like it's hot
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Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a
BPDU? |
BPDU Guard
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What is the first 24 bits in a MAC address called?
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OUI
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Which two link protocols are used to carry multiple VLANs over a single link?
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ISL
802.1q |
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List the layers of the TCP/IP model, from highest to lowest.
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4. Application
3. Transport 2. Internet 1. Link |
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List the layers of the TCP/IP model, from lowest to highest.
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1. Link
2. Internet 3. Transport 4. Application |
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Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13. An
802.1Q trunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 the native VLAN is not specified. What will happen in this scenario? |
A native VLAN mismatch error message will appear.
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Which layer in the OSI reference model is responsible for determining the availability of the receiving
program and checking to see if enough resources exist for that communication? |
Application
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Which command reveals the last method used to powercycle a router?
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show version
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When troubleshooting a Frame Relay connection, what is the first step when performing a loopback
test? |
Set the encapsulation of the interface to HDLC.
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Which two wireless encryption methods are based on the RC4 encryption algorithm?
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WEP and TKIP
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What does the (*) represent in this output:
02:16:29: NAT: s=10.10.0.2 ->1.2.4.2, d=1.2.4.1 [51607] 02:16:29: NAT: s=1.2.4.1 ->1.2.4.2, d=10.10.0.2 [55227] 02:16:29: NAT*: s=10.10.0.2 ->1.2.4.2, d=1.2.4.1 [51688] 02:16:29: NAT*: s=10.10.0.2 ->1.2.4.2, d=1.2.4.1 [51609] |
The packet was translated and fast-switched, because it was part of an existing conversation.
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What do received BECN packets mean?
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Backwards Error Congestion Notification packets are letting the router know to "back off" transmission, because the link is congested.
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What do received FECN packets mean?
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Forward Error Congestion Notification packets are telling the receiving device that the path is congested, so expect delays.
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The output of the show frame-relay pvc command shows"PVC STATUS=INACTIVE". What does
this mean? |
The PVC is configured, but down.
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What command is used to view Frame Relay connections and addresses?
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show frame-relay map
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