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Test your basic knowledge |
Ethernet Technologies
Start Test
Study First
Subject
:
it-skills
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Displays CEF Drop statistics with number of packets and reason for each line card
Switch(config-if)#switchport access vlan {vlan}
SVI or native routed interface
Switch#show cef drop
Creating the VLAN
2. What is the prerequesite for creating a working SVI?
Switch(config)#errdisable detect cause rootguard
A switch port that has been shut down automatically due to a serious error condition
Creating the VLAN
Switch#show interfaces status
3. What are the symptoms of a duplex setting mismatch between two ends of a link?
Logical Operation Unit
Slow response times - low throughput - runts and other input errors on the switch ports
CEF punt
10 km
4. Sets the administrative mode of a switch port to access
The Punt adjacency
Switch(config-if)#switchport mode access
Route caching and topology based
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
5. What function is performed by the Feature Manager (FM)?
Full duplex
Compiling Access Control Entries (ACE) into the TCAM table
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
In TCAM Value entries
6. What are the common cabling specifications for Fast Ethernet?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause gbic-invalid
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
7. What is the administrative mode of a switch port that is a member of one VLAN?
Full duplex
Static access or dynamic
In TCAM Value entries
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
8. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
From 30 seconds to 86 -400 seconds (24 hours)
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
The Discard adjacency
Switch#show cef drop
9. Resets the configuration of a switch port to its default values
Electromagnetic Interference
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Static access or dynamic
Switch(config)#default interface {interface}
10. What is error-disable state?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Tunnel
In TCAM Value entries
A switch port that has been shut down automatically due to a serious error condition
11. What is EMI?
Switch(config)#errdisable detect cause udld
Electromagnetic Interference
On
Switch(config)#errdisable recovery interval {seconds}
12. What is the maximum cabling distance for 1000BASE-SX?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Trunk
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Static access or trunk
13. What is 10GBASE-LR/LW?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
40 km
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch(config)#errdisable detect cause ilpower
14. Enables error-disable when a link is seen to be unidirectional
Switch(config)#errdisable detect cause udld
Static access - trunk - tunnel or dynamic
They are dropped (ARP throttling)
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
15. How is the TCAM organised?
By Mask/Value - where each unique mask has eight value patterns associated with it
Interconnecting switches in a campus network
ANSI X3T11 FibreChannel
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
16. What is 10BASE-T?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
17. What is the operational mode of a switch port that is a member of one VLAN?
Switch(config)#errdisable detect cause loopback
70 km for 9 micron SMF; 100 km for 8 micron SMF
By Mask/Value - where each unique mask has eight value patterns associated with it
Static access
18. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Switch#show ip cef
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
19. What is 1000BASE-T?
Switch(config)#errdisable detect cause udld
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Static access or trunk
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
20. When should CEF be disabled?
Only temporarily for debugging purposes
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Static access or trunk
Switch(config)#errdisable detect cause gbic-invalid
21. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
ANSI X3T11 FibreChannel
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Route caching and topology based
Switch(config-if)#switchport mode access
22. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config)#errdisable detect cause unicast-flood
Distributed CEF (dCEF)
SC or MT-RJ
23. What is 100BASE-T4?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
From 30 seconds to 86 -400 seconds (24 hours)
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch(config)#errdisable detect cause arp-inspection
24. What is the timer range for automatic re-enabling of error-disabled ports?
From 30 seconds to 86 -400 seconds (24 hours)
Store-and-forward
Switch(config)#errdisable detect cause security-violation
ANSI X3T11 FibreChannel
25. What information is stored in CAM?
Switch(config)#interface range macro {name}
Switch(config)#errdisable recovery cause {all | {cause-name}}
The table of learned MAC addresses - ports - and VLAN information
Carrier Sense Multiple Access Collision Detection
26. What is the default age-out time for stale entries in the CAM table?
300 seconds
R = LAN PHY; W = WAN PHY
On
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
27. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Trunk or dynamic
40 km
Switch(config)#errdisable detect cause arp-inspection
The adjacency table
28. What connectors can be used with GBIC modules?
SC fibre optic or RJ-45 UTP
Configure the appropriate values manually on both ends of the link
Switch(config-if)#switchport access vlan {vlan}
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
29. What is the name of the CEF engine that maintains routing information in software?
The Layer 3 engine
Switch(config-if)#switchport mode access
Source MAC address; Port of arrival; VLAN; Time stamp
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
30. Disables a switch port
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Slow response times - low throughput - runts and other input errors on the switch ports
Switch(config-if)#shutdown
LOU registers
31. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
In TCAM Value entries
Switch(config)#errdisable detect cause arp-inspection
Trunk or dynamic
Native routed interface
32. What are the names of the two basic generations of MLS?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
LC - MT-RJ or RJ-45
Route caching and topology based
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
33. Displays the contents of the CAM table
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Logical Operation Unit
34. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Forwarding Information Base
Switch(config)#errdisable detect cause l2ptguard
Switch(config)#errdisable detect cause dtp-flap
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
35. Disables CEF operation on an interface
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Switch(config-if)#no ip route-cache cef
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
On
36. What is the standard for 10 Gigabit Ethernet (10GbE)?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
IEEE 802.3ae
Only temporarily for debugging purposes
LOU registers
37. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause l2ptguard
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Source MAC address; Port of arrival; VLAN; Time stamp
38. What is the role of a Route Processor (RP) in first generation MLS?
Process the first packet in a traffic flow to determine the destination
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Forwarding Information Base
A name assigned to a ranges of interfaces
39. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
SVI
Full duplex only
Switch(config-if)#no switchport
Switch#show adjacency [{interface}] [summary | detail]
40. What is the DTP negotiation mode of a switch port configured as trunk?
The adjacency table
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
On
XENPAK - X2 - or SFP+
41. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
A switch port that has been shut down automatically due to a serious error condition
Switch(config-if)#shutdown
Switch#show interfaces {interface} switchport
42. What are the Gigabit Ethernet autonegotiation selection priorities?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch#show interfaces {interface} switchport
1000BASE-T full duplex followed by 1000BASE-T half duplex
A three-fold combination of 0 - 1 and X (don't care)
43. What is the default duplex mode of a 10 Mbps Ethernet interface?
In parallel revealing the best (longest) match in a single table lookup
Half duplex
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config)#errdisable detect cause l2ptguard
44. How does topology based switching work?
Feature Manager (FM) and Switching Database Manager (SDM)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Interconnecting switches in a campus network
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
45. What is the maximum cabling distance for 10GBASE-ER/EW?
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause loopback
40 km
LOU registers
46. What CEF optimisation replicates the entire FIB table among switch line cards?
Distributed CEF (dCEF)
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Multilayer Switching
CEF punt
47. What is unknown unicast flooding?
IEEE 802.3ae
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch#show ip cef
48. What are the operational modes of a Layer 2 switched interface?
ANSI X3T11 FibreChannel
Switch(config)#errdisable detect cause rootguard
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Down - static access - trunk or tunnel
49. What is 1000BASE-CX?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch#show errdisable recovery
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Value - Mask - and Result (VMR)
50. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]